[INFO] updating cached repository https://github.com/bookinstock/rust_example
[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] c83d144f2d500cd60a59da5019b4bc5ca7d2d36f
[INFO] checking bookinstock/rust_example against master#339f574809bf8e4166b8de3cdbe7df181d37af3d for pr-71896
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbookinstock%2Frust_example" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bookinstock/rust_example on toolchain 339f574809bf8e4166b8de3cdbe7df181d37af3d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+339f574809bf8e4166b8de3cdbe7df181d37af3d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/bookinstock/rust_example
[INFO] finished tweaking git repo https://github.com/bookinstock/rust_example
[INFO] tweaked toml for git repo https://github.com/bookinstock/rust_example written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/bookinstock/rust_example already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+339f574809bf8e4166b8de3cdbe7df181d37af3d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+339f574809bf8e4166b8de3cdbe7df181d37af3d" "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] 60fb83c538f9cee4b39dbc5b3d8c68c6f1c8f9296f4a6e181e961c239652584d
[INFO] running `"docker" "start" "-a" "60fb83c538f9cee4b39dbc5b3d8c68c6f1c8f9296f4a6e181e961c239652584d"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking rust_example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: path statement with no effect
[INFO] [stderr]   --> src/bin/expression.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     x;
[INFO] [stderr]    |     ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(path_statements)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/bin/expression.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     x + 1;
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/bin/expression.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |         2 * x;
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/bin/scope.rs:88:9
[INFO] [stderr]    |
[INFO] [stderr] 88 |     let x = ToDrop;
[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: unused variable: `ref_x`
[INFO] [stderr]    --> src/bin/scope.rs:401:13
[INFO] [stderr]     |
[INFO] [stderr] 401 |         let ref_x = &x;
[INFO] [stderr]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_ref_x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/bin/scope.rs:405:13
[INFO] [stderr]     |
[INFO] [stderr] 405 |         let mut ref_x = &mut x;
[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: function is never used: `ps_ref`
[INFO] [stderr]    --> src/bin/scope.rs:444:4
[INFO] [stderr]     |
[INFO] [stderr] 444 | fn ps_ref() {
[INFO] [stderr]     |    ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_literal`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:113:4
[INFO] [stderr]     |
[INFO] [stderr] 113 | fn test_literal() {}
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_array`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:115:4
[INFO] [stderr]     |
[INFO] [stderr] 115 | fn test_array() {}
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_enum`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:117:4
[INFO] [stderr]     |
[INFO] [stderr] 117 | fn test_enum() {}
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_stuct`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:119:4
[INFO] [stderr]     |
[INFO] [stderr] 119 | fn test_stuct() {}
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_variable`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:137:4
[INFO] [stderr]     |
[INFO] [stderr] 137 | fn test_variable() {}
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_wildcard`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:139:4
[INFO] [stderr]     |
[INFO] [stderr] 139 | fn test_wildcard() {}
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_placeholder`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:141:4
[INFO] [stderr]     |
[INFO] [stderr] 141 | fn test_placeholder() {}
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `vec2`
[INFO] [stderr]    --> src/bin/function.rs:391:9
[INFO] [stderr]     |
[INFO] [stderr] 391 |     let vec2 = vec![4, 5, 6];
[INFO] [stderr]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_vec2`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stderr]    --> src/bin/function.rs:431:16
[INFO] [stderr]     |
[INFO] [stderr] 431 |         array2.into_iter().find(|&&x| x == 2)
[INFO] [stderr]     |                ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(array_into_iter)]` on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `trait`
[INFO] [stderr]   --> src/bin/trait.rs:15:4
[INFO] [stderr]    |
[INFO] [stderr] 15 | */
[INFO] [stderr]    |    ^ consider adding a `main` function to `src/bin/trait.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: could not compile `rust_example`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: path statement with no effect
[INFO] [stderr]   --> src/bin/expression.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     x;
[INFO] [stderr]    |     ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(path_statements)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/bin/expression.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     x + 1;
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/bin/expression.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |         2 * x;
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused label
[INFO] [stderr]    --> src/bin/control_flow.rs:119:9
[INFO] [stderr]     |
[INFO] [stderr] 119 |         'inner: loop {
[INFO] [stderr]     |         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ttt`
[INFO] [stderr]    --> src/bin/hello.rs:107:4
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn ttt() {
[INFO] [stderr]     |    ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `f`
[INFO] [stderr]    --> src/bin/hello.rs:120:4
[INFO] [stderr]     |
[INFO] [stderr] 120 | fn f() {
[INFO] [stderr]     |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test`
[INFO] [stderr]    --> src/bin/hello.rs:124:4
[INFO] [stderr]     |
[INFO] [stderr] 124 | fn test() {
[INFO] [stderr]     |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `try_debug_trait`
[INFO] [stderr]    --> src/bin/hello.rs:159:4
[INFO] [stderr]     |
[INFO] [stderr] 159 | fn try_debug_trait() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]    --> src/bin/control_flow.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 122 |             break 'outer;
[INFO] [stderr]     |             ------------ any code following this expression is unreachable
[INFO] [stderr] ...
[INFO] [stderr] 125 |         println!("never reach");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "60fb83c538f9cee4b39dbc5b3d8c68c6f1c8f9296f4a6e181e961c239652584d"`
[INFO] running `"docker" "rm" "-f" "60fb83c538f9cee4b39dbc5b3d8c68c6f1c8f9296f4a6e181e961c239652584d"`
[INFO] [stdout] 60fb83c538f9cee4b39dbc5b3d8c68c6f1c8f9296f4a6e181e961c239652584d