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ab2ce481cd09e8974caef8935bb5d9a8e6d6d1eea6a0ee353af6d9ac80aba6e5 [INFO] running `Command { std: "docker" "start" "-a" "ab2ce481cd09e8974caef8935bb5d9a8e6d6d1eea6a0ee353af6d9ac80aba6e5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "ab2ce481cd09e8974caef8935bb5d9a8e6d6d1eea6a0ee353af6d9ac80aba6e5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ab2ce481cd09e8974caef8935bb5d9a8e6d6d1eea6a0ee353af6d9ac80aba6e5", kill_on_drop: false }` [INFO] [stdout] ab2ce481cd09e8974caef8935bb5d9a8e6d6d1eea6a0ee353af6d9ac80aba6e5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 2244fe5bbe33503d255799fbd22f40042aaf71a058704a788467152928d00c03 [INFO] running `Command { std: "docker" "start" "-a" "2244fe5bbe33503d255799fbd22f40042aaf71a058704a788467152928d00c03", kill_on_drop: false }` [INFO] [stderr] Checking utf8_slice v1.0.0 [INFO] [stderr] Checking rust-learning v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `i3` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let i3: u32 = 'a'.into(); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_i3` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: irrefutable `if let` pattern [INFO] [stdout] --> src/bin/pattern-match-match-iflet-7.rs:10:6 [INFO] [stdout] | [INFO] [stdout] 10 | if let Foo::Bar(i) = a { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this pattern will always match, so the `if let` is useless [INFO] [stdout] = help: consider replacing the `if let` with a `let` [INFO] [stdout] = note: `#[warn(irrefutable_let_patterns)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let s: String = 'a'.into(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i3_` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:16:6 [INFO] [stdout] | [INFO] [stdout] 16 | let i3_: u32 = 'a' as u32 ; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_i3_` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s_` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let s_: String = String::from('a'); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s_` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression [INFO] [stdout] --> src/bin/method-6.rs:12:13 [INFO] [stdout] | [INFO] [stdout] 12 | match (*self) { [INFO] [stdout] | ^ ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_parens)]` on by default [INFO] [stdout] help: remove these parentheses [INFO] [stdout] | [INFO] [stdout] 12 - match (*self) { [INFO] [stdout] 12 + match *self { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed [INFO] [stdout] --> src/bin/lifetime-basic-9.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | struct ImportantExcerpt<'a> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `level` is never used [INFO] [stdout] --> src/bin/lifetime-basic-9.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 6 | impl<'a> ImportantExcerpt<'a> { [INFO] [stdout] | ----------------------------- method in this implementation [INFO] [stdout] 7 | fn level(&'a self) -> i32 { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/ownership-borrowing-8.rs:9:18 [INFO] [stdout] | [INFO] [stdout] 9 | fn borrow_object(s: &mut String) {} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/flow-control-8.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | for i in 0..=100 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/pattern-match-match-iflet-8.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | Qux(u32) [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 5 | Qux(()) [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Bar` and `Baz` are never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-8.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 2 | enum Foo { [INFO] [stdout] | --- variants in this enum [INFO] [stdout] 3 | Bar, [INFO] [stdout] | ^^^ [INFO] [stdout] 4 | Baz, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Red` and `Green` are never constructed [INFO] [stdout] --> src/bin/method-6.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 3 | enum TrafficLightColor { [INFO] [stdout] | ----------------- variants in this enum [INFO] [stdout] 4 | Red, [INFO] [stdout] | ^^^ [INFO] [stdout] 5 | Yellow, [INFO] [stdout] 6 | Green, [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `TrafficLightColor` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `val` [INFO] [stdout] --> src/bin/generics-traits-const-generics-3.rs:7:18 [INFO] [stdout] | [INFO] [stdout] 7 | fn check_size(val: T) [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_val` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/ownership-borrowing-7.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::from("hello"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused label [INFO] [stdout] --> src/bin/flow-control-11.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | 'inner2: loop { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_labels)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/lifetime-basic-6.rs:5:21 [INFO] [stdout] | [INFO] [stdout] 5 | struct Borrowed<'a>(&'a i32); [INFO] [stdout] | -------- ^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] = note: `Borrowed` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/lifetime-basic-6.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 9 | struct NamedBorrowed<'a> { [INFO] [stdout] | ------------- fields in this struct [INFO] [stdout] 10 | x: &'a i32, [INFO] [stdout] | ^ [INFO] [stdout] 11 | y: &'a i32, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `NamedBorrowed` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/lifetime-basic-6.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | Num(i32), [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 16 | Num(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/lifetime-basic-6.rs:17:9 [INFO] [stdout] | [INFO] [stdout] 17 | Ref(&'a i32), [INFO] [stdout] | --- ^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 17 | Ref(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/basic-types-functions-5.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | let v = match b { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/flow-control-8.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | for i in 0..=100 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error [INFO] [stdout] --> src/bin/compound-types-string-10-1.rs:34:11 [INFO] [stdout] | [INFO] [stdout] 31 | let shift_jis = b"\x82\xe6\x82\xa8\x82\xb1\x82\xbb"; // "ようこそ" in SHIFT-JIS [INFO] [stdout] | ----------------------------------- the literal was valid UTF-8 up to the 0 bytes [INFO] [stdout] ... [INFO] [stdout] 34 | match str::from_utf8(shift_jis) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(invalid_from_utf8)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-array-4.rs:3:12 [INFO] [stdout] | [INFO] [stdout] 3 | struct I64(i64); [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-array-4.rs:4:13 [INFO] [stdout] | [INFO] [stdout] 4 | struct Char(char); [INFO] [stdout] | ---- ^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-array-4.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | I64(i64), [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 10 | I64(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-array-4.rs:11:8 [INFO] [stdout] | [INFO] [stdout] 11 | Char(char), [INFO] [stdout] | ---- ^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 11 | Char(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/flow-control-7.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | for i in 0..=100 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/compound-types-tuple-1.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let t: (u8, u16, i64, &str, String) = (1u8, 2u16, 3i64, "hello", String::from(", world")); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arrays` [INFO] [stdout] --> src/bin/generics-traits-const-generics-1.rs:8:7 [INFO] [stdout] | [INFO] [stdout] 8 | let arrays = [ [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_arrays` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `data` is never read [INFO] [stdout] --> src/bin/generics-traits-const-generics-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Array { [INFO] [stdout] | ----- field in this struct [INFO] [stdout] 4 | data : [T; N] [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Color` is never constructed [INFO] [stdout] --> src/bin/compound-types-struct-3.rs:3:8 [INFO] [stdout] | [INFO] [stdout] 3 | struct Color(i32, i32, i32); [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed [INFO] [stdout] --> src/bin/lifetime-advance-2.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | struct ImportantExcerpt<'a> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `announce_and_return_part` is never used [INFO] [stdout] --> src/bin/lifetime-advance-2.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 6 | impl<'a: 'b, 'b> ImportantExcerpt<'a> { [INFO] [stdout] | ------------------------------------- method in this implementation [INFO] [stdout] 7 | fn announce_and_return_part(&'a self, announcement: &'b str) -> &'b str { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/type-conversions-from-into-3.rs:7:13 [INFO] [stdout] | [INFO] [stdout] 7 | IoError(io::Error), [INFO] [stdout] | ------- ^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 7 | IoError(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/type-conversions-from-into-3.rs:8:16 [INFO] [stdout] | [INFO] [stdout] 8 | ParseError(num::ParseIntError), [INFO] [stdout] | ---------- ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 8 | ParseError(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `open_and_parse_file` is never used [INFO] [stdout] --> src/bin/type-conversions-from-into-3.rs:25:4 [INFO] [stdout] | [INFO] [stdout] 25 | fn open_and_parse_file(file_name: &str) -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: constant `i` should have an upper case name [INFO] [stdout] --> src/bin/lifetime-static-5.rs:19:11 [INFO] [stdout] | [INFO] [stdout] 19 | const i: i32 = 5; [INFO] [stdout] | ^ help: convert the identifier to upper case (notice the capitalization): `I` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_upper_case_globals)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/type-conversions-as-2.rs:8:7 [INFO] [stdout] | [INFO] [stdout] 8 | let v = 1000 as u8; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/ownership-borrowing-8.rs:9:18 [INFO] [stdout] | [INFO] [stdout] 9 | fn borrow_object(s: &mut String) {} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::fmt::Result` [INFO] [stdout] --> src/bin/crate-module-use-pub-1.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::fmt::Result; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::Result as IoResult` [INFO] [stdout] --> src/bin/crate-module-use-pub-1.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::io::Result as IoResult; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `p` [INFO] [stdout] --> src/bin/compound-types-struct-1.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let p = Person { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_p` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `name0` [INFO] [stdout] --> src/bin/compound-types-array-6.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let name0 = names.get(0).unwrap(); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_name0` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `name`, `age`, and `hobby` are never read [INFO] [stdout] --> src/bin/compound-types-struct-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Person { [INFO] [stdout] | ------ fields in this struct [INFO] [stdout] 4 | name: String, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | age: u8, [INFO] [stdout] | ^^^ [INFO] [stdout] 6 | hobby: String [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/compound-types-string-8.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let s1: &str = &s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Person` is never constructed [INFO] [stdout] --> src/bin/compound-types-struct-5.rs:3:8 [INFO] [stdout] | [INFO] [stdout] 3 | struct Person { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `build_person` is never used [INFO] [stdout] --> src/bin/compound-types-struct-5.rs:9:4 [INFO] [stdout] | [INFO] [stdout] 9 | fn build_person(name: String, age: u8) -> Person { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/flow-control-7.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | for i in 0..=100 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i3` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let i3: u32 = 'a'.into(); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_i3` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let s: String = 'a'.into(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i3_` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:16:6 [INFO] [stdout] | [INFO] [stdout] 16 | let i3_: u32 = 'a' as u32 ; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_i3_` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s_` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let s_: String = String::from('a'); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s_` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/compound-types-slice-1.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let s1: &[i32] = &arr[0..2]; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> src/bin/compound-types-slice-1.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let s2: &str = "hello, world" as &str; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Quit`, `Write`, and `ChangeColor` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-3.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Message { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 4 | Quit, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | Move { x: i32, y: i32 }, [INFO] [stdout] 6 | Write(String), [INFO] [stdout] | ^^^^^ [INFO] [stdout] 7 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `a` and `b` are never read [INFO] [stdout] --> src/bin/lifetime-static-2.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 2 | struct Config { [INFO] [stdout] | ------ fields in this struct [INFO] [stdout] 3 | a: String, [INFO] [stdout] | ^ [INFO] [stdout] 4 | b: String, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `Config` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: static variable `config` should have an upper case name [INFO] [stdout] --> src/bin/lifetime-static-2.rs:6:12 [INFO] [stdout] | [INFO] [stdout] 6 | static mut config: Option<&mut Config> = None; [INFO] [stdout] | ^^^^^^ help: convert the identifier to upper case: `CONFIG` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_upper_case_globals)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Color` is never constructed [INFO] [stdout] --> src/bin/compound-types-struct-3.rs:3:8 [INFO] [stdout] | [INFO] [stdout] 3 | struct Color(i32, i32, i32); [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `width` and `height` are never read [INFO] [stdout] --> src/bin/compound-types-struct-7.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 4 | struct Rectangle { [INFO] [stdout] | --------- fields in this struct [INFO] [stdout] 5 | width: u32, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 6 | height: u32, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:9:28 [INFO] [stdout] | [INFO] [stdout] 9 | fn longest<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `y` is never read [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 3 | y = x; [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r` [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let r: &'b &'a i32 = &&0; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_r` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `nput` is never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:3:4 [INFO] [stdout] | [INFO] [stdout] 3 | fn nput(x: &i32) { [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `pass` is never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:7:4 [INFO] [stdout] | [INFO] [stdout] 7 | fn pass(x: &i32) -> &i32 { x } [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `longest` is never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:9:4 [INFO] [stdout] | [INFO] [stdout] 9 | fn longest<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `y` is assigned to, but never used [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:2:34 [INFO] [stdout] | [INFO] [stdout] 2 | fn f<'a: 'b, 'b>(x: &'a i32, mut y: &'b i32) { [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_y` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Owner` is never constructed [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:13:8 [INFO] [stdout] | [INFO] [stdout] 13 | struct Owner(i32); [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `add_one` and `print` are never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:16:6 [INFO] [stdout] | [INFO] [stdout] 15 | impl Owner { [INFO] [stdout] | ---------- methods in this implementation [INFO] [stdout] 16 | fn add_one(&mut self) { self.0 += 1; } [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] 17 | fn print(&self) { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Person` is never constructed [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:22:8 [INFO] [stdout] | [INFO] [stdout] 22 | struct Person<'a> { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum `Either` is never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | enum Either<'a> { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `y` is never read [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:8:3 [INFO] [stdout] | [INFO] [stdout] 8 | y = x; // &'a i32 is a subtype of &'b i32 because 'a: 'b [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r` [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let r: &'b &'a i32 = &&0; // &'b &'a i32 is well formed because 'a: 'b [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_r` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `y` is assigned to, but never used [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:7:31 [INFO] [stdout] | [INFO] [stdout] 7 | fn f2<'a, 'b>(x: &'a i32, mut y: &'b i32) where 'a: 'b { [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_y` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `f` is never used [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn f<'a: 'b, 'b>(x: &'a i32, mut y: &'b i32) { [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `f2` is never used [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:7:4 [INFO] [stdout] | [INFO] [stdout] 7 | fn f2<'a, 'b>(x: &'a i32, mut y: &'b i32) where 'a: 'b { [INFO] [stdout] | ^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `match_number` is never used [INFO] [stdout] --> src/bin/pattern-match-patterns-1.rs:3:4 [INFO] [stdout] | [INFO] [stdout] 3 | fn match_number(n: i32) { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `name0` [INFO] [stdout] --> src/bin/compound-types-array-6.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let name0 = names.get(0).unwrap(); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_name0` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/compound-types-enum-4.rs:6:10 [INFO] [stdout] | [INFO] [stdout] 6 | Move { x: i32, y: i32 }, [INFO] [stdout] | ---- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0`, `1`, and `2` are never read [INFO] [stdout] --> src/bin/compound-types-enum-4.rs:8:15 [INFO] [stdout] | [INFO] [stdout] 8 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ----------- ^^^ ^^^ ^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stdout] | [INFO] [stdout] 8 | ChangeColor((), (), ()), [INFO] [stdout] | ~~ ~~ ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant `Write` is never constructed [INFO] [stdout] --> src/bin/compound-types-enum-4.rs:7:3 [INFO] [stdout] | [INFO] [stdout] 4 | enum Message { [INFO] [stdout] | ------- variant in this enum [INFO] [stdout] ... [INFO] [stdout] 7 | Write(String), [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `longest` is never used [INFO] [stdout] --> src/bin/lifetime-basic-3.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `TrafficLight` is never constructed [INFO] [stdout] --> src/bin/method-3.rs:1:8 [INFO] [stdout] | [INFO] [stdout] 1 | struct TrafficLight { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `show_state` and `change_state` are never used [INFO] [stdout] --> src/bin/method-3.rs:7:10 [INFO] [stdout] | [INFO] [stdout] 5 | impl TrafficLight { [INFO] [stdout] | ----------------- methods in this implementation [INFO] [stdout] 6 | // 使用 `Self` 填空 [INFO] [stdout] 7 | pub fn show_state(self: &Self) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 12 | pub fn change_state(mut self) { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `u` [INFO] [stdout] --> src/bin/compound-types-struct-2.rs:16:27 [INFO] [stdout] | [INFO] [stdout] 16 | fn do_something_with_unit(u: Unit) { } [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/bin/ownership-borrowing-11.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/bin/ownership-borrowing-11.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | let r2 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait `SomeTrait` is never used [INFO] [stdout] --> src/bin/compound-types-struct-2.rs:3:7 [INFO] [stdout] | [INFO] [stdout] 3 | trait SomeTrait { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:11 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:14 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `longest` is never used [INFO] [stdout] --> src/bin/lifetime-basic-3.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `p` [INFO] [stdout] --> src/bin/compound-types-struct-1.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let p = Person { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_p` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `name`, `age`, and `hobby` are never read [INFO] [stdout] --> src/bin/compound-types-struct-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Person { [INFO] [stdout] | ------ fields in this struct [INFO] [stdout] 4 | name: String, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | age: u8, [INFO] [stdout] | ^^^ [INFO] [stdout] 6 | hobby: String [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/pattern-match-match-iflet-8.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | Qux(u32) [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 5 | Qux(()) [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Bar` and `Baz` are never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-8.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 2 | enum Foo { [INFO] [stdout] | --- variants in this enum [INFO] [stdout] 3 | Bar, [INFO] [stdout] | ^^^ [INFO] [stdout] 4 | Baz, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/collections-vector-1.rs:28:11 [INFO] [stdout] | [INFO] [stdout] 28 | fn is_vec(v: &Vec) {} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/lifetime-basic-5.rs:11:7 [INFO] [stdout] | [INFO] [stdout] 11 | let y: & i32 = &_x; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `DoubleRef` is never constructed [INFO] [stdout] --> src/bin/lifetime-advance-1.rs:5:8 [INFO] [stdout] | [INFO] [stdout] 5 | struct DoubleRef<'a, 'b: 'a, T> { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `msg1` [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:11:7 [INFO] [stdout] | [INFO] [stdout] 11 | let msg1 = Message::Move{ x: 1, y: 1 }; // 使用x = 1, y = 2 来初始化 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_msg1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `msg2` [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:12:7 [INFO] [stdout] | [INFO] [stdout] 12 | let msg2 = Message::Write("hello, world!".to_string()); // 使用 "hello, world!" 来初始化 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_msg2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:9:28 [INFO] [stdout] | [INFO] [stdout] 9 | fn longest<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:5:10 [INFO] [stdout] | [INFO] [stdout] 5 | Move { x: i32, y: i32 }, [INFO] [stdout] | ---- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `nput` is never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:3:4 [INFO] [stdout] | [INFO] [stdout] 3 | fn nput(x: &i32) { [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | Write(String), [INFO] [stdout] | ----- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 6 | Write(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `pass` is never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:7:4 [INFO] [stdout] | [INFO] [stdout] 7 | fn pass(x: &i32) -> &i32 { x } [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `longest` is never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:9:4 [INFO] [stdout] | [INFO] [stdout] 9 | fn longest<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Quit` and `ChangeColor` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Message { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 4 | Quit, [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 7 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Owner` is never constructed [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:13:8 [INFO] [stdout] | [INFO] [stdout] 13 | struct Owner(i32); [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `add_one` and `print` are never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:16:6 [INFO] [stdout] | [INFO] [stdout] 15 | impl Owner { [INFO] [stdout] | ---------- methods in this implementation [INFO] [stdout] 16 | fn add_one(&mut self) { self.0 += 1; } [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] 17 | fn print(&self) { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Person` is never constructed [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:22:8 [INFO] [stdout] | [INFO] [stdout] 22 | struct Person<'a> { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum `Either` is never used [INFO] [stdout] --> src/bin/lifetime-basic-10.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | enum Either<'a> { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `a` and `b` are never read [INFO] [stdout] --> src/bin/lifetime-basic-7.rs:8:5 [INFO] [stdout] | [INFO] [stdout] 7 | struct Example<'a, 'b> { [INFO] [stdout] | ------- fields in this struct [INFO] [stdout] 8 | a: &'a u32, [INFO] [stdout] | ^ [INFO] [stdout] 9 | b: &'b NoCopyType [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `Example` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/ownership-borrowing-7.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::from("hello"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Person` is never constructed [INFO] [stdout] --> src/bin/compound-types-struct-5.rs:3:8 [INFO] [stdout] | [INFO] [stdout] 3 | struct Person { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `build_person` is never used [INFO] [stdout] --> src/bin/compound-types-struct-5.rs:9:4 [INFO] [stdout] | [INFO] [stdout] 9 | fn build_person(name: String, age: u8) -> Person { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Rectangle` is never constructed [INFO] [stdout] --> src/bin/method-5.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | struct Rectangle { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `area` is never used [INFO] [stdout] --> src/bin/method-5.rs:9:6 [INFO] [stdout] | [INFO] [stdout] 8 | impl Rectangle { [INFO] [stdout] | -------------- method in this implementation [INFO] [stdout] 9 | fn area(&self) -> u32 { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `can_hold` is never used [INFO] [stdout] --> src/bin/method-5.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 14 | impl Rectangle { [INFO] [stdout] | -------------- method in this implementation [INFO] [stdout] 15 | fn can_hold(&self, other: &Rectangle) -> bool { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/compound-types-string-1.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let s: &str = "hello, world"; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `p` [INFO] [stdout] --> src/bin/generics-traits-generics-4.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let p = Point{x: 5, y : "hello".to_string()}; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_p` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/generics-traits-generics-4.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Point { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] 4 | x: T, [INFO] [stdout] | ^ [INFO] [stdout] 5 | y: U, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function `new` is never used [INFO] [stdout] --> src/bin/generics-traits-traits-8.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 7 | impl Pair { [INFO] [stdout] | --------------- associated function in this implementation [INFO] [stdout] 8 | fn new(x: T, y: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `name` [INFO] [stdout] --> src/bin/flow-control-4.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | for name in &names { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_name` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/bin/flow-control-4.rs:13:7 [INFO] [stdout] | [INFO] [stdout] 13 | for n in numbers { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::fmt::Result` [INFO] [stdout] --> src/bin/crate-module-use-pub-1.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::fmt::Result; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::Result as IoResult` [INFO] [stdout] --> src/bin/crate-module-use-pub-1.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::io::Result as IoResult; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/compound-types-enum-4.rs:6:10 [INFO] [stdout] | [INFO] [stdout] 6 | Move { x: i32, y: i32 }, [INFO] [stdout] | ---- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0`, `1`, and `2` are never read [INFO] [stdout] --> src/bin/compound-types-enum-4.rs:8:15 [INFO] [stdout] | [INFO] [stdout] 8 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ----------- ^^^ ^^^ ^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stdout] | [INFO] [stdout] 8 | ChangeColor((), (), ()), [INFO] [stdout] | ~~ ~~ ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant `Write` is never constructed [INFO] [stdout] --> src/bin/compound-types-enum-4.rs:7:3 [INFO] [stdout] | [INFO] [stdout] 4 | enum Message { [INFO] [stdout] | ------- variant in this enum [INFO] [stdout] ... [INFO] [stdout] 7 | Write(String), [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `manager` is never read [INFO] [stdout] --> src/bin/lifetime-advance-6.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 2 | struct Interface<'b, 'a: 'b> { [INFO] [stdout] | --------- field in this struct [INFO] [stdout] 3 | manager: &'b mut Manager<'a> [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/compound-types-string-8.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let s1: &str = &s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: irrefutable `if let` pattern [INFO] [stdout] --> src/bin/pattern-match-match-iflet-7.rs:10:6 [INFO] [stdout] | [INFO] [stdout] 10 | if let Foo::Bar(i) = a { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this pattern will always match, so the `if let` is useless [INFO] [stdout] = help: consider replacing the `if let` with a `let` [INFO] [stdout] = note: `#[warn(irrefutable_let_patterns)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_c` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:27:4 [INFO] [stdout] | [INFO] [stdout] 27 | fn print_c(t: &'static dyn Display) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_d` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:31:4 [INFO] [stdout] | [INFO] [stdout] 31 | fn print_d(t: &'static impl Display) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_g` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:43:4 [INFO] [stdout] | [INFO] [stdout] 43 | fn print_g(t: &'static String) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `p` [INFO] [stdout] --> src/bin/generics-traits-generics-4.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let p = Point{x: 5, y : "hello".to_string()}; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_p` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/generics-traits-generics-4.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Point { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] 4 | x: T, [INFO] [stdout] | ^ [INFO] [stdout] 5 | y: U, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `call_on_ref_zero` is never used [INFO] [stdout] --> src/bin/lifetime-advance-4.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn call_on_ref_zero(f: F) where for<'a> F: Fn(&'a i32) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/basic-types-functions-5.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | let v = match b { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: constant `i` should have an upper case name [INFO] [stdout] --> src/bin/lifetime-static-5.rs:19:11 [INFO] [stdout] | [INFO] [stdout] 19 | const i: i32 = 5; [INFO] [stdout] | ^ help: convert the identifier to upper case (notice the capitalization): `I` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_upper_case_globals)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: irrefutable `if let` pattern [INFO] [stdout] --> src/bin/compound-types-enum-5.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | if let n = six { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this pattern will always match, so the `if let` is useless [INFO] [stdout] = help: consider replacing the `if let` with a `let` [INFO] [stdout] = note: `#[warn(irrefutable_let_patterns)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `none` [INFO] [stdout] --> src/bin/compound-types-enum-5.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | let none = plus_one(None); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression [INFO] [stdout] --> src/bin/method-6.rs:12:13 [INFO] [stdout] | [INFO] [stdout] 12 | match (*self) { [INFO] [stdout] | ^ ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_parens)]` on by default [INFO] [stdout] help: remove these parentheses [INFO] [stdout] | [INFO] [stdout] 12 - match (*self) { [INFO] [stdout] 12 + match *self { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Red` and `Green` are never constructed [INFO] [stdout] --> src/bin/method-6.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 3 | enum TrafficLightColor { [INFO] [stdout] | ----------------- variants in this enum [INFO] [stdout] 4 | Red, [INFO] [stdout] | ^^^ [INFO] [stdout] 5 | Yellow, [INFO] [stdout] 6 | Green, [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `TrafficLightColor` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `fly` is never used [INFO] [stdout] --> src/bin/generics-traits-trait-object-2.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 6 | impl Duck { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] 7 | fn fly(&self) { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `fly` is never used [INFO] [stdout] --> src/bin/generics-traits-trait-object-2.rs:13:6 [INFO] [stdout] | [INFO] [stdout] 12 | impl Swan { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] 13 | fn fly(&self) { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/bin/ownership-borrowing-11.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/bin/ownership-borrowing-11.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | let r2 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `East`, `West`, and `North` are never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Direction { [INFO] [stdout] | --------- variants in this enum [INFO] [stdout] 4 | East, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | West, [INFO] [stdout] | ^^^^ [INFO] [stdout] 6 | North, [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: irrefutable `if let` pattern [INFO] [stdout] --> src/bin/compound-types-enum-5.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | if let n = six { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this pattern will always match, so the `if let` is useless [INFO] [stdout] = help: consider replacing the `if let` with a `let` [INFO] [stdout] = note: `#[warn(irrefutable_let_patterns)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `none` [INFO] [stdout] --> src/bin/compound-types-enum-5.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | let none = plus_one(None); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused label [INFO] [stdout] --> src/bin/flow-control-11.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | 'inner2: loop { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_labels)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `content` is never read [INFO] [stdout] --> src/bin/generics-traits-traits-5.rs:12:3 [INFO] [stdout] | [INFO] [stdout] 9 | struct Post { [INFO] [stdout] | ---- field in this struct [INFO] [stdout] ... [INFO] [stdout] 12 | content: String, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Post` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/compound-types-slice-1.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let s1: &[i32] = &arr[0..2]; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> src/bin/compound-types-slice-1.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let s2: &str = "hello, world" as &str; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/ownership-borrowing-3.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let mut s = String::from("hello, "); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/ownership-borrowing-3.rs:9:18 [INFO] [stdout] | [INFO] [stdout] 9 | fn borrow_object(s: &String) {} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Rectangle` is never constructed [INFO] [stdout] --> src/bin/method-5.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | struct Rectangle { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `area` is never used [INFO] [stdout] --> src/bin/method-5.rs:9:6 [INFO] [stdout] | [INFO] [stdout] 8 | impl Rectangle { [INFO] [stdout] | -------------- method in this implementation [INFO] [stdout] 9 | fn area(&self) -> u32 { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `can_hold` is never used [INFO] [stdout] --> src/bin/method-5.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 14 | impl Rectangle { [INFO] [stdout] | -------------- method in this implementation [INFO] [stdout] 15 | fn can_hold(&self, other: &Rectangle) -> bool { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `manager` is never read [INFO] [stdout] --> src/bin/lifetime-advance-6.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 2 | struct Interface<'b, 'a: 'b> { [INFO] [stdout] | --------- field in this struct [INFO] [stdout] 3 | manager: &'b mut Manager<'a> [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/ownership-borrowing-3.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let mut s = String::from("hello, "); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/ownership-borrowing-3.rs:9:18 [INFO] [stdout] | [INFO] [stdout] 9 | fn borrow_object(s: &String) {} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `u` [INFO] [stdout] --> src/bin/compound-types-struct-2.rs:16:27 [INFO] [stdout] | [INFO] [stdout] 16 | fn do_something_with_unit(u: Unit) { } [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait `SomeTrait` is never used [INFO] [stdout] --> src/bin/compound-types-struct-2.rs:3:7 [INFO] [stdout] | [INFO] [stdout] 3 | trait SomeTrait { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `East`, `West`, and `North` are never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Direction { [INFO] [stdout] | --------- variants in this enum [INFO] [stdout] 4 | East, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | West, [INFO] [stdout] | ^^^^ [INFO] [stdout] 6 | North, [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `get_option` is never used [INFO] [stdout] --> src/bin/basic-types-functions-4.rs:6:4 [INFO] [stdout] | [INFO] [stdout] 6 | fn get_option(tp: u8) -> Option { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `never_return_fn` is never used [INFO] [stdout] --> src/bin/basic-types-functions-4.rs:21:4 [INFO] [stdout] | [INFO] [stdout] 21 | fn never_return_fn() -> ! { [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/pattern-match-match-iflet-3.rs:7:15 [INFO] [stdout] | [INFO] [stdout] 7 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ----------- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 7 | ChangeColor((), i32, i32), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant `Write` is never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-3.rs:6:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Message { [INFO] [stdout] | ------- variant in this enum [INFO] [stdout] ... [INFO] [stdout] 6 | Write(String), [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function `new` is never used [INFO] [stdout] --> src/bin/generics-traits-traits-8.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 7 | impl Pair { [INFO] [stdout] | --------------- associated function in this implementation [INFO] [stdout] 8 | fn new(x: T, y: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c1` [INFO] [stdout] --> src/bin/type-conversions-as-1.rs:8:7 [INFO] [stdout] | [INFO] [stdout] 8 | let c1: char = decimal as u8 as char; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c2` [INFO] [stdout] --> src/bin/type-conversions-as-1.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let c2 = integer as char; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `msg1` [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:11:7 [INFO] [stdout] | [INFO] [stdout] 11 | let msg1 = Message::Move{ x: 1, y: 1 }; // 使用x = 1, y = 2 来初始化 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_msg1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `msg2` [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:12:7 [INFO] [stdout] | [INFO] [stdout] 12 | let msg2 = Message::Write("hello, world!".to_string()); // 使用 "hello, world!" 来初始化 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_msg2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `DoubleRef` is never constructed [INFO] [stdout] --> src/bin/lifetime-advance-1.rs:5:8 [INFO] [stdout] | [INFO] [stdout] 5 | struct DoubleRef<'a, 'b: 'a, T> { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:5:10 [INFO] [stdout] | [INFO] [stdout] 5 | Move { x: i32, y: i32 }, [INFO] [stdout] | ---- ^ ^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | Write(String), [INFO] [stdout] | ----- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 6 | Write(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Quit` and `ChangeColor` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-2.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Message { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 4 | Quit, [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 7 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed [INFO] [stdout] --> src/bin/lifetime-advance-2.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | struct ImportantExcerpt<'a> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `announce_and_return_part` is never used [INFO] [stdout] --> src/bin/lifetime-advance-2.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 6 | impl<'a: 'b, 'b> ImportantExcerpt<'a> { [INFO] [stdout] | ------------------------------------- method in this implementation [INFO] [stdout] 7 | fn announce_and_return_part(&'a self, announcement: &'b str) -> &'b str { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/type-conversions-as-2.rs:8:7 [INFO] [stdout] | [INFO] [stdout] 8 | let v = 1000 as u8; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed [INFO] [stdout] --> src/bin/lifetime-basic-9.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | struct ImportantExcerpt<'a> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `level` is never used [INFO] [stdout] --> src/bin/lifetime-basic-9.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 6 | impl<'a> ImportantExcerpt<'a> { [INFO] [stdout] | ----------------------------- method in this implementation [INFO] [stdout] 7 | fn level(&'a self) -> i32 { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/collections-vector-1.rs:28:11 [INFO] [stdout] | [INFO] [stdout] 28 | fn is_vec(v: &Vec) {} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error [INFO] [stdout] --> src/bin/compound-types-string-10-1.rs:34:11 [INFO] [stdout] | [INFO] [stdout] 31 | let shift_jis = b"\x82\xe6\x82\xa8\x82\xb1\x82\xbb"; // "ようこそ" in SHIFT-JIS [INFO] [stdout] | ----------------------------------- the literal was valid UTF-8 up to the 0 bytes [INFO] [stdout] ... [INFO] [stdout] 34 | match str::from_utf8(shift_jis) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(invalid_from_utf8)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Quit`, `Write`, and `ChangeColor` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-3.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Message { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 4 | Quit, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | Move { x: i32, y: i32 }, [INFO] [stdout] 6 | Write(String), [INFO] [stdout] | ^^^^^ [INFO] [stdout] 7 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:11 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:14 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `u2` [INFO] [stdout] --> src/bin/compound-types-struct-6.rs:17:7 [INFO] [stdout] | [INFO] [stdout] 17 | let u2 = set_email(u1); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_u2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `active`, `username`, `email`, and `sign_in_count` are never read [INFO] [stdout] --> src/bin/compound-types-struct-6.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct User { [INFO] [stdout] | ---- fields in this struct [INFO] [stdout] 4 | active: bool, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] 5 | username: String, [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] 6 | email: String, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 7 | sign_in_count: u64, [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `invalid_output` is never used [INFO] [stdout] --> src/bin/lifetime-basic-4.rs:10:4 [INFO] [stdout] | [INFO] [stdout] 10 | fn invalid_output<'a>(s: &'a String) -> &'a String { [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/ownership-borrowing-9.rs:11:18 [INFO] [stdout] | [INFO] [stdout] 11 | fn borrow_object(s: &String) {} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/pattern-match-match-iflet-3.rs:7:15 [INFO] [stdout] | [INFO] [stdout] 7 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ----------- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 7 | ChangeColor((), i32, i32), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant `Write` is never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-3.rs:6:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Message { [INFO] [stdout] | ------- variant in this enum [INFO] [stdout] ... [INFO] [stdout] 6 | Write(String), [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `a` and `b` are never read [INFO] [stdout] --> src/bin/lifetime-static-2.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 2 | struct Config { [INFO] [stdout] | ------ fields in this struct [INFO] [stdout] 3 | a: String, [INFO] [stdout] | ^ [INFO] [stdout] 4 | b: String, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `Config` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: static variable `config` should have an upper case name [INFO] [stdout] --> src/bin/lifetime-static-2.rs:6:12 [INFO] [stdout] | [INFO] [stdout] 6 | static mut config: Option<&mut Config> = None; [INFO] [stdout] | ^^^^^^ help: convert the identifier to upper case: `CONFIG` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_upper_case_globals)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `call_on_ref_zero` is never used [INFO] [stdout] --> src/bin/lifetime-advance-4.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn call_on_ref_zero(f: F) where for<'a> F: Fn(&'a i32) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `ele` [INFO] [stdout] --> src/bin/result-panic-panic-2.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | let ele = v[2]; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_ele` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `ele` [INFO] [stdout] --> src/bin/result-panic-panic-2.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let ele = v.get(2).unwrap(); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_ele` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/result-panic-panic-2.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let v = production_rate_per_hour(2); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `val` [INFO] [stdout] --> src/bin/generics-traits-const-generics-3.rs:7:18 [INFO] [stdout] | [INFO] [stdout] 7 | fn check_size(val: T) [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_val` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `width` and `height` are never read [INFO] [stdout] --> src/bin/compound-types-struct-7.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 4 | struct Rectangle { [INFO] [stdout] | --------- fields in this struct [INFO] [stdout] 5 | width: u32, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 6 | height: u32, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/compound-types-string-1.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let s: &str = "hello, world"; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `fly` is never used [INFO] [stdout] --> src/bin/generics-traits-trait-object-1.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 13 | impl Swan { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] 14 | fn fly(&self) { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `integer` [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let integer = Point { x: 5, y: 10 }; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `float` [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let float = Point { x: 1.0, y: 4.0 }; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_float` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Point { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] 4 | x: T, [INFO] [stdout] | ^ [INFO] [stdout] 5 | y: T, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `fly` is never used [INFO] [stdout] --> src/bin/generics-traits-trait-object-2.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 6 | impl Duck { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] 7 | fn fly(&self) { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `fly` is never used [INFO] [stdout] --> src/bin/generics-traits-trait-object-2.rs:13:6 [INFO] [stdout] | [INFO] [stdout] 12 | impl Swan { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] 13 | fn fly(&self) { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `a` and `b` are never read [INFO] [stdout] --> src/bin/lifetime-basic-7.rs:8:5 [INFO] [stdout] | [INFO] [stdout] 7 | struct Example<'a, 'b> { [INFO] [stdout] | ------- fields in this struct [INFO] [stdout] 8 | a: &'a u32, [INFO] [stdout] | ^ [INFO] [stdout] 9 | b: &'b NoCopyType [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `Example` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `name` [INFO] [stdout] --> src/bin/flow-control-4.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | for name in &names { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_name` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/bin/flow-control-4.rs:13:7 [INFO] [stdout] | [INFO] [stdout] 13 | for n in numbers { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `fly` is never used [INFO] [stdout] --> src/bin/generics-traits-trait-object-1.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 13 | impl Swan { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] 14 | fn fly(&self) { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/type-conversions-from-into-3.rs:7:13 [INFO] [stdout] | [INFO] [stdout] 7 | IoError(io::Error), [INFO] [stdout] | ------- ^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 7 | IoError(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/type-conversions-from-into-3.rs:8:16 [INFO] [stdout] | [INFO] [stdout] 8 | ParseError(num::ParseIntError), [INFO] [stdout] | ---------- ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 8 | ParseError(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `open_and_parse_file` is never used [INFO] [stdout] --> src/bin/type-conversions-from-into-3.rs:25:4 [INFO] [stdout] | [INFO] [stdout] 25 | fn open_and_parse_file(file_name: &str) -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/ownership-borrowing-9.rs:11:18 [INFO] [stdout] | [INFO] [stdout] 11 | fn borrow_object(s: &String) {} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `content` is never read [INFO] [stdout] --> src/bin/generics-traits-traits-5.rs:12:3 [INFO] [stdout] | [INFO] [stdout] 9 | struct Post { [INFO] [stdout] | ---- field in this struct [INFO] [stdout] ... [INFO] [stdout] 12 | content: String, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Post` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-array-4.rs:3:12 [INFO] [stdout] | [INFO] [stdout] 3 | struct I64(i64); [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-array-4.rs:4:13 [INFO] [stdout] | [INFO] [stdout] 4 | struct Char(char); [INFO] [stdout] | ---- ^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-array-4.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | I64(i64), [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 10 | I64(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/compound-types-array-4.rs:11:8 [INFO] [stdout] | [INFO] [stdout] 11 | Char(char), [INFO] [stdout] | ---- ^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 11 | Char(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `invalid_output` is never used [INFO] [stdout] --> src/bin/lifetime-basic-4.rs:10:4 [INFO] [stdout] | [INFO] [stdout] 10 | fn invalid_output<'a>(s: &'a String) -> &'a String { [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/lifetime-basic-6.rs:5:21 [INFO] [stdout] | [INFO] [stdout] 5 | struct Borrowed<'a>(&'a i32); [INFO] [stdout] | -------- ^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] = note: `Borrowed` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/lifetime-basic-6.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 9 | struct NamedBorrowed<'a> { [INFO] [stdout] | ------------- fields in this struct [INFO] [stdout] 10 | x: &'a i32, [INFO] [stdout] | ^ [INFO] [stdout] 11 | y: &'a i32, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `NamedBorrowed` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/lifetime-basic-6.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | Num(i32), [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 16 | Num(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/lifetime-basic-6.rs:17:9 [INFO] [stdout] | [INFO] [stdout] 17 | Ref(&'a i32), [INFO] [stdout] | --- ^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 17 | Ref(()), [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arr0` [INFO] [stdout] --> src/bin/compound-types-array-2.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let arr0 = [1, 2, 3]; [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_arr0` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c1` [INFO] [stdout] --> src/bin/type-conversions-as-1.rs:8:7 [INFO] [stdout] | [INFO] [stdout] 8 | let c1: char = decimal as u8 as char; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c2` [INFO] [stdout] --> src/bin/type-conversions-as-1.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let c2 = integer as char; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Number { [INFO] [stdout] | ------ variants in this enum [INFO] [stdout] 4 | Zero, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | One, [INFO] [stdout] 6 | Two, [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:10:3 [INFO] [stdout] | [INFO] [stdout] 9 | enum Number1 { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 10 | Zero = 0, [INFO] [stdout] | ^^^^ [INFO] [stdout] 11 | One, [INFO] [stdout] 12 | Two, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:17:3 [INFO] [stdout] | [INFO] [stdout] 16 | enum Number2 { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 17 | Zero = 0, [INFO] [stdout] | ^^^^ [INFO] [stdout] 18 | One = 1, [INFO] [stdout] 19 | Two = 2, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arr0` [INFO] [stdout] --> src/bin/compound-types-array-2.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let arr0 = [1, 2, 3]; [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_arr0` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Number { [INFO] [stdout] | ------ variants in this enum [INFO] [stdout] 4 | Zero, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | One, [INFO] [stdout] 6 | Two, [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:10:3 [INFO] [stdout] | [INFO] [stdout] 9 | enum Number1 { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 10 | Zero = 0, [INFO] [stdout] | ^^^^ [INFO] [stdout] 11 | One, [INFO] [stdout] 12 | Two, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:17:3 [INFO] [stdout] | [INFO] [stdout] 16 | enum Number2 { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 17 | Zero = 0, [INFO] [stdout] | ^^^^ [INFO] [stdout] 18 | One = 1, [INFO] [stdout] 19 | Two = 2, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `TrafficLight` is never constructed [INFO] [stdout] --> src/bin/method-3.rs:1:8 [INFO] [stdout] | [INFO] [stdout] 1 | struct TrafficLight { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `show_state` and `change_state` are never used [INFO] [stdout] --> src/bin/method-3.rs:7:10 [INFO] [stdout] | [INFO] [stdout] 5 | impl TrafficLight { [INFO] [stdout] | ----------------- methods in this implementation [INFO] [stdout] 6 | // 使用 `Self` 填空 [INFO] [stdout] 7 | pub fn show_state(self: &Self) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 12 | pub fn change_state(mut self) { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arrays` [INFO] [stdout] --> src/bin/generics-traits-const-generics-1.rs:8:7 [INFO] [stdout] | [INFO] [stdout] 8 | let arrays = [ [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_arrays` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `data` is never read [INFO] [stdout] --> src/bin/generics-traits-const-generics-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Array { [INFO] [stdout] | ----- field in this struct [INFO] [stdout] 4 | data : [T; N] [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/lifetime-basic-5.rs:11:7 [INFO] [stdout] | [INFO] [stdout] 11 | let y: & i32 = &_x; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `u2` [INFO] [stdout] --> src/bin/compound-types-struct-6.rs:17:7 [INFO] [stdout] | [INFO] [stdout] 17 | let u2 = set_email(u1); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_u2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_c` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:27:4 [INFO] [stdout] | [INFO] [stdout] 27 | fn print_c(t: &'static dyn Display) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_d` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:31:4 [INFO] [stdout] | [INFO] [stdout] 31 | fn print_d(t: &'static impl Display) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_g` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:43:4 [INFO] [stdout] | [INFO] [stdout] 43 | fn print_g(t: &'static String) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `active`, `username`, `email`, and `sign_in_count` are never read [INFO] [stdout] --> src/bin/compound-types-struct-6.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct User { [INFO] [stdout] | ---- fields in this struct [INFO] [stdout] 4 | active: bool, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] 5 | username: String, [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] 6 | email: String, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 7 | sign_in_count: u64, [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `match_number` is never used [INFO] [stdout] --> src/bin/pattern-match-patterns-1.rs:3:4 [INFO] [stdout] | [INFO] [stdout] 3 | fn match_number(n: i32) { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `y` is never read [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 3 | y = x; [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r` [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let r: &'b &'a i32 = &&0; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_r` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `y` is assigned to, but never used [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:2:34 [INFO] [stdout] | [INFO] [stdout] 2 | fn f<'a: 'b, 'b>(x: &'a i32, mut y: &'b i32) { [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_y` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `y` is never read [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:8:3 [INFO] [stdout] | [INFO] [stdout] 8 | y = x; // &'a i32 is a subtype of &'b i32 because 'a: 'b [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r` [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let r: &'b &'a i32 = &&0; // &'b &'a i32 is well formed because 'a: 'b [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_r` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `y` is assigned to, but never used [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:7:31 [INFO] [stdout] | [INFO] [stdout] 7 | fn f2<'a, 'b>(x: &'a i32, mut y: &'b i32) where 'a: 'b { [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_y` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `f` is never used [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn f<'a: 'b, 'b>(x: &'a i32, mut y: &'b i32) { [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `f2` is never used [INFO] [stdout] --> src/bin/lifetime-advance-3.rs:7:4 [INFO] [stdout] | [INFO] [stdout] 7 | fn f2<'a, 'b>(x: &'a i32, mut y: &'b i32) where 'a: 'b { [INFO] [stdout] | ^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/compound-types-tuple-1.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let t: (u8, u16, i64, &str, String) = (1u8, 2u16, 3i64, "hello", String::from(", world")); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `integer` [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let integer = Point { x: 5, y: 10 }; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `float` [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let float = Point { x: 1.0, y: 4.0 }; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_float` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Point { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] 4 | x: T, [INFO] [stdout] | ^ [INFO] [stdout] 5 | y: T, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `ele` [INFO] [stdout] --> src/bin/result-panic-panic-2.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | let ele = v[2]; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_ele` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `ele` [INFO] [stdout] --> src/bin/result-panic-panic-2.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let ele = v.get(2).unwrap(); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_ele` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `get_option` is never used [INFO] [stdout] --> src/bin/basic-types-functions-4.rs:6:4 [INFO] [stdout] | [INFO] [stdout] 6 | fn get_option(tp: u8) -> Option { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `never_return_fn` is never used [INFO] [stdout] --> src/bin/basic-types-functions-4.rs:21:4 [INFO] [stdout] | [INFO] [stdout] 21 | fn never_return_fn() -> ! { [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/result-panic-panic-2.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let v = production_rate_per_hour(2); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.39s [INFO] running `Command { std: "docker" "inspect" "2244fe5bbe33503d255799fbd22f40042aaf71a058704a788467152928d00c03", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2244fe5bbe33503d255799fbd22f40042aaf71a058704a788467152928d00c03", kill_on_drop: false }` [INFO] [stdout] 2244fe5bbe33503d255799fbd22f40042aaf71a058704a788467152928d00c03 [INFO] checking zongzi531/rust-learning against try#f9935d29d867449445ee008640ccca1bf1ae0889+rustflags=-Dtail_expr_drop_order for crater-rollup-uwu [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzongzi531%2Frust-learning" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/zongzi531/rust-learning on toolchain f9935d29d867449445ee008640ccca1bf1ae0889 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/zongzi531/rust-learning [INFO] finished tweaking git repo https://github.com/zongzi531/rust-learning [INFO] tweaked toml for git repo https://github.com/zongzi531/rust-learning written to /workspace/builds/worker-7-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/zongzi531/rust-learning already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 5c56a7f8245ef8d9ad9775b557b3892068059e7400b29bea0c36208936814e71 [INFO] running `Command { std: "docker" "start" "-a" "5c56a7f8245ef8d9ad9775b557b3892068059e7400b29bea0c36208936814e71", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "5c56a7f8245ef8d9ad9775b557b3892068059e7400b29bea0c36208936814e71", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5c56a7f8245ef8d9ad9775b557b3892068059e7400b29bea0c36208936814e71", kill_on_drop: false }` [INFO] [stdout] 5c56a7f8245ef8d9ad9775b557b3892068059e7400b29bea0c36208936814e71 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dtail_expr_drop_order" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 2a972c6e26f68672eb2ff339631438de9f9a517e97f7334280b673a5857a7393 [INFO] running `Command { std: "docker" "start" "-a" "2a972c6e26f68672eb2ff339631438de9f9a517e97f7334280b673a5857a7393", kill_on_drop: false }` [INFO] [stderr] Checking utf8_slice v1.0.0 [INFO] [stderr] Checking rust-learning v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed [INFO] [stdout] --> src/bin/lifetime-basic-9.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | struct ImportantExcerpt<'a> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `level` is never used [INFO] [stdout] --> src/bin/lifetime-basic-9.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 6 | impl<'a> ImportantExcerpt<'a> { [INFO] [stdout] | ----------------------------- method in this implementation [INFO] [stdout] 7 | fn level(&'a self) -> i32 { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `East`, `West`, and `North` are never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Direction { [INFO] [stdout] | --------- variants in this enum [INFO] [stdout] 4 | East, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | West, [INFO] [stdout] | ^^^^ [INFO] [stdout] 6 | North, [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `get_option` is never used [INFO] [stdout] --> src/bin/basic-types-functions-4.rs:6:4 [INFO] [stdout] | [INFO] [stdout] 6 | fn get_option(tp: u8) -> Option { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `never_return_fn` is never used [INFO] [stdout] --> src/bin/basic-types-functions-4.rs:21:4 [INFO] [stdout] | [INFO] [stdout] 21 | fn never_return_fn() -> ! { [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Quit`, `Write`, and `ChangeColor` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-3.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Message { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 4 | Quit, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | Move { x: i32, y: i32 }, [INFO] [stdout] 6 | Write(String), [INFO] [stdout] | ^^^^^ [INFO] [stdout] 7 | ChangeColor(i32, i32, i32), [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/compound-types-slice-1.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | let s1: &[i32] = &arr[0..2]; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> src/bin/compound-types-slice-1.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let s2: &str = "hello, world" as &str; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/pattern-match-match-iflet-8.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | Qux(u32) [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 5 | Qux(()) [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Bar` and `Baz` are never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-8.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 2 | enum Foo { [INFO] [stdout] | --- variants in this enum [INFO] [stdout] 3 | Bar, [INFO] [stdout] | ^^^ [INFO] [stdout] 4 | Baz, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:8 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:11 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/bin/compound-types-tuple-5.rs:2:14 [INFO] [stdout] | [INFO] [stdout] 2 | let (x, y, z): (i32, i32, i32); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::fmt::Result` [INFO] [stdout] --> src/bin/crate-module-use-pub-1.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::fmt::Result; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::Result as IoResult` [INFO] [stdout] --> src/bin/crate-module-use-pub-1.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::io::Result as IoResult; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/compound-types-tuple-1.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let t: (u8, u16, i64, &str, String) = (1u8, 2u16, 3i64, "hello", String::from(", world")); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error [INFO] [stdout] --> src/bin/compound-types-string-10-1.rs:34:11 [INFO] [stdout] | [INFO] [stdout] 31 | let shift_jis = b"\x82\xe6\x82\xa8\x82\xb1\x82\xbb"; // "ようこそ" in SHIFT-JIS [INFO] [stdout] | ----------------------------------- the literal was valid UTF-8 up to the 0 bytes [INFO] [stdout] ... [INFO] [stdout] 34 | match str::from_utf8(shift_jis) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(invalid_from_utf8)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i3` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let i3: u32 = 'a'.into(); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_i3` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let s: String = 'a'.into(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i3_` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:16:6 [INFO] [stdout] | [INFO] [stdout] 16 | let i3_: u32 = 'a' as u32 ; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_i3_` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s_` [INFO] [stdout] --> src/bin/type-conversions-from-into-1.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let s_: String = String::from('a'); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s_` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `integer` [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let integer = Point { x: 5, y: 10 }; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `float` [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let float = Point { x: 1.0, y: 4.0 }; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_float` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Point { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] 4 | x: T, [INFO] [stdout] | ^ [INFO] [stdout] 5 | y: T, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/flow-control-7.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | for i in 0..=100 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_c` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:27:4 [INFO] [stdout] | [INFO] [stdout] 27 | fn print_c(t: &'static dyn Display) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_d` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:31:4 [INFO] [stdout] | [INFO] [stdout] 31 | fn print_d(t: &'static impl Display) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `print_g` is never used [INFO] [stdout] --> src/bin/lifetime-static-6.rs:43:4 [INFO] [stdout] | [INFO] [stdout] 43 | fn print_g(t: &'static String) { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/bin/generics-traits-advanced-traits-2.rs:18:16 [INFO] [stdout] | [INFO] [stdout] 16 | fn sub(self, other: Self) -> Self::Output { [INFO] [stdout] | ---- ----------- these values have significant drop implementation and will observe changes in drop order under Edition 2024 [INFO] [stdout] | | [INFO] [stdout] | these values have significant drop implementation and will observe changes in drop order under Edition 2024 [INFO] [stdout] 17 | Point { [INFO] [stdout] 18 | x: self.x - other.x, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: requested on the command line with `-D tail-expr-drop-order` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/bin/generics-traits-advanced-traits-2.rs:19:16 [INFO] [stdout] | [INFO] [stdout] 16 | fn sub(self, other: Self) -> Self::Output { [INFO] [stdout] | ---- ----------- these values have significant drop implementation and will observe changes in drop order under Edition 2024 [INFO] [stdout] | | [INFO] [stdout] | these values have significant drop implementation and will observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 19 | y: self.y - other.y, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | enum Number { [INFO] [stdout] | ------ variants in this enum [INFO] [stdout] 4 | Zero, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | One, [INFO] [stdout] 6 | Two, [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:10:3 [INFO] [stdout] | [INFO] [stdout] 9 | enum Number1 { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 10 | Zero = 0, [INFO] [stdout] | ^^^^ [INFO] [stdout] 11 | One, [INFO] [stdout] 12 | Two, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Zero` and `Two` are never constructed [INFO] [stdout] --> src/bin/compound-types-enum-1.rs:17:3 [INFO] [stdout] | [INFO] [stdout] 16 | enum Number2 { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 17 | Zero = 0, [INFO] [stdout] | ^^^^ [INFO] [stdout] 18 | One = 1, [INFO] [stdout] 19 | Two = 2, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 2 previous errors [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `rust-learning` (bin "generics-traits-advanced-traits-2") due to 3 previous errors [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/bin/pattern-match-match-iflet-8.rs:5:7 [INFO] [stdout] | [INFO] [stdout] 5 | Qux(u32) [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 5 | Qux(()) [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Bar` and `Baz` are never constructed [INFO] [stdout] --> src/bin/pattern-match-match-iflet-8.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 2 | enum Foo { [INFO] [stdout] | --- variants in this enum [INFO] [stdout] 3 | Bar, [INFO] [stdout] | ^^^ [INFO] [stdout] 4 | Baz, [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `integer` [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let integer = Point { x: 5, y: 10 }; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `float` [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:10:7 [INFO] [stdout] | [INFO] [stdout] 10 | let float = Point { x: 1.0, y: 4.0 }; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_float` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> src/bin/generics-traits-generics-3.rs:4:3 [INFO] [stdout] | [INFO] [stdout] 3 | struct Point { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] 4 | x: T, [INFO] [stdout] | ^ [INFO] [stdout] 5 | y: T, [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "2a972c6e26f68672eb2ff339631438de9f9a517e97f7334280b673a5857a7393", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2a972c6e26f68672eb2ff339631438de9f9a517e97f7334280b673a5857a7393", kill_on_drop: false }` [INFO] [stdout] 2a972c6e26f68672eb2ff339631438de9f9a517e97f7334280b673a5857a7393