[INFO] cloning repository https://github.com/arunma/rust_scratch
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arunma/rust_scratch" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunma%2Frust_scratch", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunma%2Frust_scratch'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 810b734d28ae0e63abb6afb6a22b0bfab9fa6313
[INFO] checking arunma/rust_scratch against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunma%2Frust_scratch" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-4-tc1/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/arunma/rust_scratch
[INFO] finished tweaking git repo https://github.com/arunma/rust_scratch
[INFO] tweaked toml for git repo https://github.com/arunma/rust_scratch written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/arunma/rust_scratch on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/arunma/rust_scratch 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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_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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "be8e22b532ee9aa25b354b1f472d33639bc7bd09b744ead605971923d9f66d7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be8e22b532ee9aa25b354b1f472d33639bc7bd09b744ead605971923d9f66d7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be8e22b532ee9aa25b354b1f472d33639bc7bd09b744ead605971923d9f66d7e", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "7f869faa9f8bef2770009eb3c41c8a2b4065cced42b7a6c6441bc0d6e85faa82", kill_on_drop: false }`
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[INFO] [stdout] warning: method `bar` is never used
[INFO] [stdout]  --> src/bin/impl_traits_return_type.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | trait Bar: Debug {
[INFO] [stdout]   |       --- method in this trait
[INFO] [stdout] 4 |     fn bar(&self) -> u32 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/bin/commit_index.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/bin/rc_refcell.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 7 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 7 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/bin/lifetime_longest_func_ref.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |                ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/lifetime_longest_func_ref.rs:1:28
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/bin/rc.rs:24:10
[INFO] [stdout]    |
[INFO] [stdout] 24 |     Cons(i32, Rc<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 24 -     Cons(i32, Rc<List>),
[INFO] [stdout] 24 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `File`
[INFO] [stdout]  --> tests/arbitrary3.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 |         fs::{File, OpenOptions},
[INFO] [stdout]   |              ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `sqlx::testing::TestFixture`
[INFO] [stdout]   --> tests/arbitrary3.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     use sqlx::testing::TestFixture;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `style::VerticalLine`
[INFO] [stdout]   --> tests/arbitrary3.rs:11:50
[INFO] [stdout]    |
[INFO] [stdout] 11 |     use tabled::{builder::Builder, object::Cell, style::VerticalLine, Modify, Span, Style};
[INFO] [stdout]    |                                                  ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> tests/arbitrary3.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]  --> tests/world.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use super::*;
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/arbitrary3.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 178 |         let mut file = OpenOptions::new()
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]    --> tests/arbitrary3.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 178 |         let mut file = OpenOptions::new()
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data1`
[INFO] [stdout]    --> tests/arbitrary3.rs:186:13
[INFO] [stdout]     |
[INFO] [stdout] 186 |         let data1: Vec<Vec<u32>> = vec![
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_data1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col_count`
[INFO] [stdout]    --> tests/arbitrary3.rs:254:17
[INFO] [stdout]     |
[INFO] [stdout] 254 |             let col_count = r.len();
[INFO] [stdout]     |                 ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_col_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Display` and `Formatter`
[INFO] [stdout]  --> src/bin/error2.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Display, Formatter};
[INFO] [stdout]   |                ^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/bin/scratch.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |         _ => panic!("expected borrowed value"),
[INFO] [stdout]    |         ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/bin/scratch.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Cow::Owned(_) => println!("I own this slice!"),
[INFO] [stdout]    |         ------------- matches some of the same values
[INFO] [stdout] 21 |         Cow::Borrowed(_) => println!("I own this slice!"),
[INFO] [stdout]    |         ---------------- matches some of the same values
[INFO] [stdout] 22 |         _ => panic!("expected borrowed value"),
[INFO] [stdout]    |         ^ collectively making this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `bar` is never used
[INFO] [stdout]  --> src/bin/impl_traits_return_type.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | trait Bar: Debug {
[INFO] [stdout]   |       --- method in this trait
[INFO] [stdout] 4 |     fn bar(&self) -> u32 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/bin/error1.rs:13:19
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/bin/error1.rs:23:19
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CustomErrorB` is never constructed
[INFO] [stdout]  --> src/bin/error1.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct CustomErrorB{
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_function_b` is never used
[INFO] [stdout]   --> src/bin/error1.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn error_function_b() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CustomErrorA` is never constructed
[INFO] [stdout]  --> src/bin/error2.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct CustomErrorA{
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_function_a` is never used
[INFO] [stdout]   --> src/bin/error2.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn error_function_a() -> Result<(), CustomErrorA> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:402:9
[INFO] [stdout]     |
[INFO] [stdout] 402 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 402 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:403:9
[INFO] [stdout]     |
[INFO] [stdout] 403 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 403 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:408:9
[INFO] [stdout]     |
[INFO] [stdout] 408 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 408 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:848:9
[INFO] [stdout]     |
[INFO] [stdout] 848 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 848 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:849:9
[INFO] [stdout]     |
[INFO] [stdout] 849 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 849 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:854:9
[INFO] [stdout]     |
[INFO] [stdout] 854 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 854 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:972:9
[INFO] [stdout]     |
[INFO] [stdout] 972 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 972 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:973:9
[INFO] [stdout]     |
[INFO] [stdout] 973 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 973 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/arbitrary3.rs:978:9
[INFO] [stdout]     |
[INFO] [stdout] 978 | ...   writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 978 |         let _ = writeln!(file, "                                                                                                                             ");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `OpenOptions`, and `io::Write`
[INFO] [stdout]  --> tests/arbitrary2.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 |         fs::{File, OpenOptions},
[INFO] [stdout]   |              ^^^^  ^^^^^^^^^^^
[INFO] [stdout] 6 |         io::Write,
[INFO] [stdout]   |         ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Whatev` is never used
[INFO] [stdout]  --> src/bin/impl_traits.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait Whatev {
[INFO] [stdout]   |       ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Hello` is never constructed
[INFO] [stdout]  --> src/bin/impl_traits.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Hello {}
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/bin/commit_index.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/lifetime_stack_overflow.rs:1:25
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn foo1<'a>(x: &'a u32, y: &'a u32) -> &'a u32 {
[INFO] [stdout]   |                         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/lifetime_stack_overflow.rs:5:29
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn foo2<'a, 'b>(x: &'a u32, y: &'b u32) -> &'a u32 {
[INFO] [stdout]   |                             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:14:26
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn rule1<'a>(x: &'a u32, y: &'a u32) -> &'a u32 {
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:41:29
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn rule3<'a, 'b>(&self, x: &'a u32, _y: &'b u32) -> &u32 {
[INFO] [stdout]    |                             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rule1` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn rule1<'a>(x: &'a u32, y: &'a u32) -> &'a u32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rule11` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn rule11<'a>(x: &'a u32, y: &'a u32) -> &'a u32 {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rule12` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn rule12<'a>(x: &'a u32, y: &'a u32) -> u32 {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rule2` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn rule2(x: &u32) -> &u32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Hello` is never constructed
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct Hello {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `rule3` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl Hello {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn rule3<'a, 'b>(&self, x: &'a u32, _y: &'b u32) -> &u32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/bin/try_from_into.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 48 |             _ => Err(IntoColorError::BadLen),
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/bin/try_from_into.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             (r @ 0..=255, g @ 0..=255, b @ 0..=255) => Ok(Color {
[INFO] [stdout]    |             --------------------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 47 |             (_, _, _) => Err(IntoColorError::IntConversion),
[INFO] [stdout]    |             --------- matches some of the same values
[INFO] [stdout] 48 |             _ => Err(IntoColorError::BadLen),
[INFO] [stdout]    |             ^ collectively making this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Display` and `Formatter`
[INFO] [stdout]  --> src/bin/error3.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Display, Formatter};
[INFO] [stdout]   |                ^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `CustomErrorA` is never constructed
[INFO] [stdout]  --> src/bin/error3.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | enum AppError {
[INFO] [stdout]   |      -------- variant in this enum
[INFO] [stdout] 8 |     #[error("CustomErrorA with message {message:?}")]
[INFO] [stdout] 9 |     CustomErrorA { message: String },
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `AppError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_function_a` is never used
[INFO] [stdout]   --> src/bin/error3.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn error_function_a() -> Result<()> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_function_c` is never used
[INFO] [stdout]   --> src/bin/error3.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn error_function_c() -> Result<()> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]  --> src/bin/dyn_dispatch_type_params.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Display;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `hello2` is never used
[INFO] [stdout]   --> src/bin/dyn_dispatch_type_params.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout]  3 | trait Super {
[INFO] [stdout]    |       ----- associated function in this trait
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn hello2() -> Self
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/bin/refcell.rs:12:27
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]    |                           ^^                 ^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                           |
[INFO] [stdout]    |                           the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/bin/rc_refcell.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 7 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 7 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]  --> src/bin/dyn_dispatch_type_params.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Display;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Rng`
[INFO] [stdout]  --> tests/arbitrary.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         Rng, SeedableRng,
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> tests/arbitrary.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/bin/refcell.rs:12:27
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]    |                           ^^                 ^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                           |
[INFO] [stdout]    |                           the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Display` and `Formatter`
[INFO] [stdout]  --> src/bin/error2.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Display, Formatter};
[INFO] [stdout]   |                ^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `hello2` is never used
[INFO] [stdout]   --> src/bin/dyn_dispatch_type_params.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout]  3 | trait Super {
[INFO] [stdout]    |       ----- associated function in this trait
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn hello2() -> Self
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CustomErrorA` is never constructed
[INFO] [stdout]  --> src/bin/error2.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct CustomErrorA{
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_function_a` is never used
[INFO] [stdout]   --> src/bin/error2.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn error_function_a() -> Result<(), CustomErrorA> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/bin/error1.rs:13:19
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/bin/error1.rs:23:19
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CustomErrorB` is never constructed
[INFO] [stdout]  --> src/bin/error1.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct CustomErrorB{
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_function_b` is never used
[INFO] [stdout]   --> src/bin/error1.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn error_function_b() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `convert::Infallible`
[INFO] [stdout]  --> src/bin/actixweb.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{convert::Infallible, io};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/lifetime_stack_overflow.rs:1:25
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn foo1<'a>(x: &'a u32, y: &'a u32) -> &'a u32 {
[INFO] [stdout]   |                         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/lifetime_stack_overflow.rs:5:29
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn foo2<'a, 'b>(x: &'a u32, y: &'b u32) -> &'a u32 {
[INFO] [stdout]   |                             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:14:26
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn rule1<'a>(x: &'a u32, y: &'a u32) -> &'a u32 {
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:41:29
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn rule3<'a, 'b>(&self, x: &'a u32, _y: &'b u32) -> &u32 {
[INFO] [stdout]    |                             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rule1` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn rule1<'a>(x: &'a u32, y: &'a u32) -> &'a u32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rule11` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn rule11<'a>(x: &'a u32, y: &'a u32) -> &'a u32 {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rule12` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn rule12<'a>(x: &'a u32, y: &'a u32) -> u32 {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rule2` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn rule2(x: &u32) -> &u32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Hello` is never constructed
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct Hello {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `rule3` is never used
[INFO] [stdout]   --> src/bin/lifetime_stack_overflow.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl Hello {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn rule3<'a, 'b>(&self, x: &'a u32, _y: &'b u32) -> &u32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/arbitrary.rs:147:13
[INFO] [stdout]     |
[INFO] [stdout] 147 |         let mut data = vec![
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/bin/lifetime_longest_func_ref.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |                ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/lifetime_longest_func_ref.rs:1:28
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/bin/try_from_into.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 48 |             _ => Err(IntoColorError::BadLen),
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/bin/try_from_into.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             (r @ 0..=255, g @ 0..=255, b @ 0..=255) => Ok(Color {
[INFO] [stdout]    |             --------------------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 47 |             (_, _, _) => Err(IntoColorError::IntConversion),
[INFO] [stdout]    |             --------- matches some of the same values
[INFO] [stdout] 48 |             _ => Err(IntoColorError::BadLen),
[INFO] [stdout]    |             ^ collectively making this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `convert::Infallible`
[INFO] [stdout]  --> src/bin/actixweb.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{convert::Infallible, io};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `server3`
[INFO] [stdout]   --> src/bin/actixweb.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let server3 = HttpServer::new(closure)
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_server3`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Whatev` is never used
[INFO] [stdout]  --> src/bin/impl_traits.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait Whatev {
[INFO] [stdout]   |       ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Hello` is never constructed
[INFO] [stdout]  --> src/bin/impl_traits.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Hello {}
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `index` is never used
[INFO] [stdout]  --> src/bin/actixweb.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | async fn index() -> impl Responder {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]   --> src/bin/actixweb.rs:31:10
[INFO] [stdout]    |
[INFO] [stdout] 31 | async fn hello() -> io::Result<()> {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `helper2` is never used
[INFO] [stdout]  --> tests/helpers/mod.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn helper2() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `server3`
[INFO] [stdout]   --> src/bin/actixweb.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let server3 = HttpServer::new(closure)
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_server3`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `index` is never used
[INFO] [stdout]  --> src/bin/actixweb.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | async fn index() -> impl Responder {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]   --> src/bin/actixweb.rs:31:10
[INFO] [stdout]    |
[INFO] [stdout] 31 | async fn hello() -> io::Result<()> {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]  --> src/bin/lifetime_struct.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ---------------- field in this struct
[INFO] [stdout] 3 |     part: &'a str,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `ImportantExcerpt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/bin/rc.rs:24:10
[INFO] [stdout]    |
[INFO] [stdout] 24 |     Cons(i32, Rc<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 24 -     Cons(i32, Rc<List>),
[INFO] [stdout] 24 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/bin/scratch.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |         _ => panic!("expected borrowed value"),
[INFO] [stdout]    |         ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/bin/scratch.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Cow::Owned(_) => println!("I own this slice!"),
[INFO] [stdout]    |         ------------- matches some of the same values
[INFO] [stdout] 21 |         Cow::Borrowed(_) => println!("I own this slice!"),
[INFO] [stdout]    |         ---------------- matches some of the same values
[INFO] [stdout] 22 |         _ => panic!("expected borrowed value"),
[INFO] [stdout]    |         ^ collectively making this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Display` and `Formatter`
[INFO] [stdout]  --> src/bin/error3.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Display, Formatter};
[INFO] [stdout]   |                ^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]  --> src/bin/lifetime_struct.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ---------------- field in this struct
[INFO] [stdout] 3 |     part: &'a str,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `ImportantExcerpt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `CustomErrorA` is never constructed
[INFO] [stdout]  --> src/bin/error3.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | enum AppError {
[INFO] [stdout]   |      -------- variant in this enum
[INFO] [stdout] 8 |     #[error("CustomErrorA with message {message:?}")]
[INFO] [stdout] 9 |     CustomErrorA { message: String },
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `AppError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_function_a` is never used
[INFO] [stdout]   --> src/bin/error3.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn error_function_a() -> Result<()> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_function_c` is never used
[INFO] [stdout]   --> src/bin/error3.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn error_function_c() -> Result<()> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3m 02s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: sqlx-core v0.6.2
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 4`
[INFO] running `Command { std: "docker" "inspect" "7f869faa9f8bef2770009eb3c41c8a2b4065cced42b7a6c6441bc0d6e85faa82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f869faa9f8bef2770009eb3c41c8a2b4065cced42b7a6c6441bc0d6e85faa82", kill_on_drop: false }`
[INFO] [stdout] 7f869faa9f8bef2770009eb3c41c8a2b4065cced42b7a6c6441bc0d6e85faa82
