[INFO] updating cached repository https://github.com/gdemarcsek/learn-rust [INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"` [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] c8caf07a1205b8638e5b0711fd943f663662d11d [INFO] checking gdemarcsek/learn-rust against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393 [INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgdemarcsek%2Flearn-rust" "/workspace/builds/worker-7/source"` [INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/gdemarcsek/learn-rust on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d [INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started tweaking git repo https://github.com/gdemarcsek/learn-rust [INFO] finished tweaking git repo https://github.com/gdemarcsek/learn-rust [INFO] tweaked toml for git repo https://github.com/gdemarcsek/learn-rust written to /workspace/builds/worker-7/source/Cargo.toml [INFO] crate git repo https://github.com/gdemarcsek/learn-rust already has a lockfile, it will not be regenerated [INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 947f7a9077c6c23818328f57e22df72e6d0bbedff575252ff5e53151d39cef0b [INFO] running `"docker" "start" "-a" "947f7a9077c6c23818328f57e22df72e6d0bbedff575252ff5e53151d39cef0b"` [INFO] [stderr] Checking learn-rust v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] warning: unused import: `std::*` [INFO] [stderr] --> src/main.rs:297:9 [INFO] [stderr] | [INFO] [stderr] 297 | use std::*; // glob import from Rust's standard library [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unreachable pattern [INFO] [stderr] --> src/main.rs:269:9 [INFO] [stderr] | [INFO] [stderr] 269 | _ => -1, // _ is a placeholder that matches any value - if we put it as last, this will mean what the "default" label menas for "switch" in C++ [INFO] [stderr] | ^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unreachable_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/main.rs:17:9 [INFO] [stderr] | [INFO] [stderr] 17 | let x = 42; // (type is inferred by the compiler whenever possible) [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable `x` is assigned to, but never used [INFO] [stderr] --> src/main.rs:19:9 [INFO] [stderr] | [INFO] [stderr] 19 | let mut x = 42; // Now 'x' is declared to be mutable, thus... [INFO] [stderr] | ^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: consider using `_x` instead [INFO] [stderr] [INFO] [stderr] warning: value assigned to `x` is never read [INFO] [stderr] --> src/main.rs:20:5 [INFO] [stderr] | [INFO] [stderr] 20 | x = 21; // its value can be changed later on [INFO] [stderr] | ^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_assignments)]` on by default [INFO] [stderr] = help: maybe it is overwritten before being read? [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/main.rs:40:13 [INFO] [stderr] | [INFO] [stderr] 40 | let s = String::from("dynamically allocated string"); // s owns the allocated memory... [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/main.rs:50:9 [INFO] [stderr] | [INFO] [stderr] 50 | let y = x; // a copy of the value of 'x' [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s4` [INFO] [stderr] --> src/main.rs:72:9 [INFO] [stderr] | [INFO] [stderr] 72 | let s4 = gives_ownership(); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s4` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/main.rs:105:13 [INFO] [stderr] | [INFO] [stderr] 105 | let r1 = &mut s1; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/main.rs:110:9 [INFO] [stderr] | [INFO] [stderr] 110 | let r2 = &s1; // but out of the scope of 'r1', we can create a reference again... [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r3` [INFO] [stderr] --> src/main.rs:111:9 [INFO] [stderr] | [INFO] [stderr] 111 | let r3 = &s1; // ...even multiple immutable ones [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r3` [INFO] [stderr] [INFO] [stderr] warning: value assigned to `slice3` is never read [INFO] [stderr] --> src/main.rs:150:9 [INFO] [stderr] | [INFO] [stderr] 150 | let mut slice3 = &s[1..6]; [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: maybe it is overwritten before being read? [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice4` [INFO] [stderr] --> src/main.rs:155:9 [INFO] [stderr] | [INFO] [stderr] 155 | let slice4: &[i32]; // the type of each item must be 'i32' [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice4` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `red` [INFO] [stderr] --> src/main.rs:191:9 [INFO] [stderr] | [INFO] [stderr] 191 | let red = RGBColor(0xff, 0x00, 0x00); [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_red` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `foreign` [INFO] [stderr] --> src/main.rs:233:9 [INFO] [stderr] | [INFO] [stderr] 233 | let foreign = IpAddress::V6(314159263, 123442); [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_foreign` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `some_ip` [INFO] [stderr] --> src/main.rs:238:9 [INFO] [stderr] | [INFO] [stderr] 238 | let some_ip = Some(home); [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_ip` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `absent_ip` [INFO] [stderr] --> src/main.rs:240:9 [INFO] [stderr] | [INFO] [stderr] 240 | let absent_ip: Option = None; [INFO] [stderr] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_absent_ip` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/main.rs:243:9 [INFO] [stderr] | [INFO] [stderr] 243 | let x: i8 = 5; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/main.rs:244:9 [INFO] [stderr] | [INFO] [stderr] 244 | let y: Option = Some(5); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `retcode` [INFO] [stderr] --> src/main.rs:259:9 [INFO] [stderr] | [INFO] [stderr] 259 | let retcode = match error { // match forces us to cover all possible cases [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_retcode` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:139:9 [INFO] [stderr] | [INFO] [stderr] 139 | let mut s = String::from("hello world"); [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variant is never constructed: `NetworkError` [INFO] [stderr] --> src/main.rs:252:9 [INFO] [stderr] | [INFO] [stderr] 252 | NetworkError, [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variant is never constructed: `SerilizationError` [INFO] [stderr] --> src/main.rs:253:9 [INFO] [stderr] | [INFO] [stderr] 253 | SerilizationError(String), [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `closures` [INFO] [stderr] --> src/main.rs:310:4 [INFO] [stderr] | [INFO] [stderr] 310 | fn closures() { [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: variable `className` should have a snake case name [INFO] [stderr] --> src/main.rs:264:41 [INFO] [stderr] | [INFO] [stderr] 264 | RPCCallError::SerilizationError(className) => { [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `class_name` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` on by default [INFO] [stderr] [INFO] [stderr] warning: 25 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::*` [INFO] [stderr] --> src/main.rs:297:9 [INFO] [stderr] | [INFO] [stderr] 297 | use std::*; // glob import from Rust's standard library [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unreachable pattern [INFO] [stderr] --> src/main.rs:269:9 [INFO] [stderr] | [INFO] [stderr] 269 | _ => -1, // _ is a placeholder that matches any value - if we put it as last, this will mean what the "default" label menas for "switch" in C++ [INFO] [stderr] | ^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unreachable_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/main.rs:17:9 [INFO] [stderr] | [INFO] [stderr] 17 | let x = 42; // (type is inferred by the compiler whenever possible) [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable `x` is assigned to, but never used [INFO] [stderr] --> src/main.rs:19:9 [INFO] [stderr] | [INFO] [stderr] 19 | let mut x = 42; // Now 'x' is declared to be mutable, thus... [INFO] [stderr] | ^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: consider using `_x` instead [INFO] [stderr] [INFO] [stderr] warning: value assigned to `x` is never read [INFO] [stderr] --> src/main.rs:20:5 [INFO] [stderr] | [INFO] [stderr] 20 | x = 21; // its value can be changed later on [INFO] [stderr] | ^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_assignments)]` on by default [INFO] [stderr] = help: maybe it is overwritten before being read? [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/main.rs:40:13 [INFO] [stderr] | [INFO] [stderr] 40 | let s = String::from("dynamically allocated string"); // s owns the allocated memory... [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/main.rs:50:9 [INFO] [stderr] | [INFO] [stderr] 50 | let y = x; // a copy of the value of 'x' [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s4` [INFO] [stderr] --> src/main.rs:72:9 [INFO] [stderr] | [INFO] [stderr] 72 | let s4 = gives_ownership(); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s4` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/main.rs:105:13 [INFO] [stderr] | [INFO] [stderr] 105 | let r1 = &mut s1; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/main.rs:110:9 [INFO] [stderr] | [INFO] [stderr] 110 | let r2 = &s1; // but out of the scope of 'r1', we can create a reference again... [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r3` [INFO] [stderr] --> src/main.rs:111:9 [INFO] [stderr] | [INFO] [stderr] 111 | let r3 = &s1; // ...even multiple immutable ones [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r3` [INFO] [stderr] [INFO] [stderr] warning: value assigned to `slice3` is never read [INFO] [stderr] --> src/main.rs:150:9 [INFO] [stderr] | [INFO] [stderr] 150 | let mut slice3 = &s[1..6]; [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: maybe it is overwritten before being read? [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice4` [INFO] [stderr] --> src/main.rs:155:9 [INFO] [stderr] | [INFO] [stderr] 155 | let slice4: &[i32]; // the type of each item must be 'i32' [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice4` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `red` [INFO] [stderr] --> src/main.rs:191:9 [INFO] [stderr] | [INFO] [stderr] 191 | let red = RGBColor(0xff, 0x00, 0x00); [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_red` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `foreign` [INFO] [stderr] --> src/main.rs:233:9 [INFO] [stderr] | [INFO] [stderr] 233 | let foreign = IpAddress::V6(314159263, 123442); [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_foreign` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `some_ip` [INFO] [stderr] --> src/main.rs:238:9 [INFO] [stderr] | [INFO] [stderr] 238 | let some_ip = Some(home); [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_ip` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `absent_ip` [INFO] [stderr] --> src/main.rs:240:9 [INFO] [stderr] | [INFO] [stderr] 240 | let absent_ip: Option = None; [INFO] [stderr] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_absent_ip` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/main.rs:243:9 [INFO] [stderr] | [INFO] [stderr] 243 | let x: i8 = 5; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/main.rs:244:9 [INFO] [stderr] | [INFO] [stderr] 244 | let y: Option = Some(5); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `retcode` [INFO] [stderr] --> src/main.rs:259:9 [INFO] [stderr] | [INFO] [stderr] 259 | let retcode = match error { // match forces us to cover all possible cases [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_retcode` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:139:9 [INFO] [stderr] | [INFO] [stderr] 139 | let mut s = String::from("hello world"); [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variant is never constructed: `NetworkError` [INFO] [stderr] --> src/main.rs:252:9 [INFO] [stderr] | [INFO] [stderr] 252 | NetworkError, [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variant is never constructed: `SerilizationError` [INFO] [stderr] --> src/main.rs:253:9 [INFO] [stderr] | [INFO] [stderr] 253 | SerilizationError(String), [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `closures` [INFO] [stderr] --> src/main.rs:310:4 [INFO] [stderr] | [INFO] [stderr] 310 | fn closures() { [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: variable `className` should have a snake case name [INFO] [stderr] --> src/main.rs:264:41 [INFO] [stderr] | [INFO] [stderr] 264 | RPCCallError::SerilizationError(className) => { [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `class_name` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` on by default [INFO] [stderr] [INFO] [stderr] warning: 25 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.75s [INFO] running `"docker" "inspect" "947f7a9077c6c23818328f57e22df72e6d0bbedff575252ff5e53151d39cef0b"` [INFO] running `"docker" "rm" "-f" "947f7a9077c6c23818328f57e22df72e6d0bbedff575252ff5e53151d39cef0b"` [INFO] [stdout] 947f7a9077c6c23818328f57e22df72e6d0bbedff575252ff5e53151d39cef0b