Dec 19 16:13:19.807 INFO checking hardvain/rust-practice against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 16:13:19.807 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-3/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/hardvain/rust-practice:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 16:13:20.160 INFO [stdout] bfde46c775b6266510d05a679718b6c285b020546961ea46288f3d36468615a7
Dec 19 16:13:20.162 INFO running `"docker" "start" "-a" "bfde46c775b6266510d05a679718b6c285b020546961ea46288f3d36468615a7"`
Dec 19 16:13:21.145 INFO [stderr]     Checking practice v0.1.0 (/opt/crater/workdir)
Dec 19 16:13:21.306 INFO [stderr] warning: unused variable: `sample`
Dec 19 16:13:21.306 INFO [stderr]  --> src/main.rs:9:24
Dec 19 16:13:21.306 INFO [stderr]   |
Dec 19 16:13:21.306 INFO [stderr] 9 | fn taking_owned_sample(sample: Sample) {}
Dec 19 16:13:21.306 INFO [stderr]   |                        ^^^^^^ help: consider using `_sample` instead
Dec 19 16:13:21.306 INFO [stderr]   |
Dec 19 16:13:21.306 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 16:13:21.306 INFO [stderr] 
Dec 19 16:13:21.306 INFO [stderr] warning: unused variable: `sample`
Dec 19 16:13:21.306 INFO [stderr]   --> src/main.rs:10:25
Dec 19 16:13:21.306 INFO [stderr]    |
Dec 19 16:13:21.306 INFO [stderr] 10 | fn taking_shared_sample(sample: &Sample) {}
Dec 19 16:13:21.306 INFO [stderr]    |                         ^^^^^^ help: consider using `_sample` instead
Dec 19 16:13:21.306 INFO [stderr] 
Dec 19 16:13:21.306 INFO [stderr] warning: unused variable: `sample`
Dec 19 16:13:21.306 INFO [stderr]   --> src/main.rs:11:26
Dec 19 16:13:21.306 INFO [stderr]    |
Dec 19 16:13:21.306 INFO [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {}
Dec 19 16:13:21.306 INFO [stderr]    |                          ^^^^^^ help: consider using `_sample` instead
Dec 19 16:13:21.306 INFO [stderr] 
Dec 19 16:13:21.306 INFO [stderr] warning: unused variable: `sample`
Dec 19 16:13:21.306 INFO [stderr]   --> src/main.rs:37:9
Dec 19 16:13:21.306 INFO [stderr]    |
Dec 19 16:13:21.306 INFO [stderr] 37 |     let sample = Sample { key: 1 };
Dec 19 16:13:21.306 INFO [stderr]    |         ^^^^^^ help: consider using `_sample` instead
Dec 19 16:13:21.306 INFO [stderr] 
Dec 19 16:13:21.306 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.306 INFO [stderr]   --> src/main.rs:44:9
Dec 19 16:13:21.306 INFO [stderr]    |
Dec 19 16:13:21.306 INFO [stderr] 44 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.306 INFO [stderr]    |         ----^^^^^^
Dec 19 16:13:21.306 INFO [stderr]    |         |
Dec 19 16:13:21.306 INFO [stderr]    |         help: remove this `mut`
Dec 19 16:13:21.306 INFO [stderr]    |
Dec 19 16:13:21.306 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 16:13:21.306 INFO [stderr] 
Dec 19 16:13:21.306 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.306 INFO [stderr]   --> src/main.rs:60:9
Dec 19 16:13:21.306 INFO [stderr]    |
Dec 19 16:13:21.306 INFO [stderr] 60 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.306 INFO [stderr]    |         ----^^^^^^
Dec 19 16:13:21.306 INFO [stderr]    |         |
Dec 19 16:13:21.306 INFO [stderr]    |         help: remove this `mut`
Dec 19 16:13:21.306 INFO [stderr] 
Dec 19 16:13:21.309 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.309 INFO [stderr]    --> src/main.rs:113:9
Dec 19 16:13:21.309 INFO [stderr]     |
Dec 19 16:13:21.309 INFO [stderr] 113 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.309 INFO [stderr]     |         ----^^^^^^
Dec 19 16:13:21.309 INFO [stderr]     |         |
Dec 19 16:13:21.309 INFO [stderr]     |         help: remove this `mut`
Dec 19 16:13:21.309 INFO [stderr] 
Dec 19 16:13:21.309 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.309 INFO [stderr]    --> src/main.rs:121:9
Dec 19 16:13:21.309 INFO [stderr]     |
Dec 19 16:13:21.309 INFO [stderr] 121 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.310 INFO [stderr]     |         ----^^^^^^
Dec 19 16:13:21.310 INFO [stderr]     |         |
Dec 19 16:13:21.310 INFO [stderr]     |         help: remove this `mut`
Dec 19 16:13:21.310 INFO [stderr] 
Dec 19 16:13:21.310 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.310 INFO [stderr]    --> src/main.rs:130:9
Dec 19 16:13:21.310 INFO [stderr]     |
Dec 19 16:13:21.310 INFO [stderr] 130 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.310 INFO [stderr]     |         ----^^^^^^
Dec 19 16:13:21.310 INFO [stderr]     |         |
Dec 19 16:13:21.310 INFO [stderr]     |         help: remove this `mut`
Dec 19 16:13:21.310 INFO [stderr] 
Dec 19 16:13:21.310 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.310 INFO [stderr]    --> src/main.rs:137:9
Dec 19 16:13:21.310 INFO [stderr]     |
Dec 19 16:13:21.310 INFO [stderr] 137 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.310 INFO [stderr]     |         ----^^^^^^
Dec 19 16:13:21.310 INFO [stderr]     |         |
Dec 19 16:13:21.310 INFO [stderr]     |         help: remove this `mut`
Dec 19 16:13:21.310 INFO [stderr] 
Dec 19 16:13:21.310 INFO [stderr] warning: field is never used: `key`
Dec 19 16:13:21.310 INFO [stderr]  --> src/main.rs:2:3
Dec 19 16:13:21.310 INFO [stderr]   |
Dec 19 16:13:21.310 INFO [stderr] 2 |   key: i32,
Dec 19 16:13:21.310 INFO [stderr]   |   ^^^^^^^^
Dec 19 16:13:21.310 INFO [stderr]   |
Dec 19 16:13:21.310 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 19 16:13:21.310 INFO [stderr] 
Dec 19 16:13:21.310 INFO [stderr] warning: function is never used: `taking_mutable_sample`
Dec 19 16:13:21.310 INFO [stderr]   --> src/main.rs:11:1
Dec 19 16:13:21.310 INFO [stderr]    |
Dec 19 16:13:21.310 INFO [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {}
Dec 19 16:13:21.310 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 16:13:21.310 INFO [stderr] 
Dec 19 16:13:21.310 INFO [stderr] warning: function is never used: `mutable_binding_function_calls`
Dec 19 16:13:21.310 INFO [stderr]   --> src/main.rs:42:1
Dec 19 16:13:21.310 INFO [stderr]    |
Dec 19 16:13:21.310 INFO [stderr] 42 | fn mutable_binding_function_calls() {
Dec 19 16:13:21.310 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 16:13:21.310 INFO [stderr] 
Dec 19 16:13:21.320 INFO [stderr] warning: unused variable: `sample`
Dec 19 16:13:21.320 INFO [stderr]  --> src/main.rs:9:24
Dec 19 16:13:21.320 INFO [stderr]   |
Dec 19 16:13:21.320 INFO [stderr] 9 | fn taking_owned_sample(sample: Sample) {}
Dec 19 16:13:21.320 INFO [stderr]   |                        ^^^^^^ help: consider using `_sample` instead
Dec 19 16:13:21.320 INFO [stderr]   |
Dec 19 16:13:21.320 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 16:13:21.320 INFO [stderr] 
Dec 19 16:13:21.320 INFO [stderr] warning: unused variable: `sample`
Dec 19 16:13:21.320 INFO [stderr]   --> src/main.rs:10:25
Dec 19 16:13:21.320 INFO [stderr]    |
Dec 19 16:13:21.320 INFO [stderr] 10 | fn taking_shared_sample(sample: &Sample) {}
Dec 19 16:13:21.320 INFO [stderr]    |                         ^^^^^^ help: consider using `_sample` instead
Dec 19 16:13:21.320 INFO [stderr] 
Dec 19 16:13:21.320 INFO [stderr] warning: unused variable: `sample`
Dec 19 16:13:21.320 INFO [stderr]   --> src/main.rs:11:26
Dec 19 16:13:21.320 INFO [stderr]    |
Dec 19 16:13:21.320 INFO [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {}
Dec 19 16:13:21.320 INFO [stderr]    |                          ^^^^^^ help: consider using `_sample` instead
Dec 19 16:13:21.320 INFO [stderr] 
Dec 19 16:13:21.320 INFO [stderr] warning: unused variable: `sample`
Dec 19 16:13:21.320 INFO [stderr]   --> src/main.rs:37:9
Dec 19 16:13:21.320 INFO [stderr]    |
Dec 19 16:13:21.320 INFO [stderr] 37 |     let sample = Sample { key: 1 };
Dec 19 16:13:21.320 INFO [stderr]    |         ^^^^^^ help: consider using `_sample` instead
Dec 19 16:13:21.320 INFO [stderr] 
Dec 19 16:13:21.320 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.320 INFO [stderr]   --> src/main.rs:44:9
Dec 19 16:13:21.320 INFO [stderr]    |
Dec 19 16:13:21.320 INFO [stderr] 44 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.320 INFO [stderr]    |         ----^^^^^^
Dec 19 16:13:21.320 INFO [stderr]    |         |
Dec 19 16:13:21.320 INFO [stderr]    |         help: remove this `mut`
Dec 19 16:13:21.320 INFO [stderr]    |
Dec 19 16:13:21.320 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 16:13:21.320 INFO [stderr] 
Dec 19 16:13:21.320 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.320 INFO [stderr]   --> src/main.rs:60:9
Dec 19 16:13:21.320 INFO [stderr]    |
Dec 19 16:13:21.320 INFO [stderr] 60 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.320 INFO [stderr]    |         ----^^^^^^
Dec 19 16:13:21.320 INFO [stderr]    |         |
Dec 19 16:13:21.320 INFO [stderr]    |         help: remove this `mut`
Dec 19 16:13:21.320 INFO [stderr] 
Dec 19 16:13:21.325 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.325 INFO [stderr]    --> src/main.rs:113:9
Dec 19 16:13:21.325 INFO [stderr]     |
Dec 19 16:13:21.325 INFO [stderr] 113 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.325 INFO [stderr]     |         ----^^^^^^
Dec 19 16:13:21.325 INFO [stderr]     |         |
Dec 19 16:13:21.325 INFO [stderr]     |         help: remove this `mut`
Dec 19 16:13:21.325 INFO [stderr] 
Dec 19 16:13:21.325 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.325 INFO [stderr]    --> src/main.rs:121:9
Dec 19 16:13:21.325 INFO [stderr]     |
Dec 19 16:13:21.325 INFO [stderr] 121 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.325 INFO [stderr]     |         ----^^^^^^
Dec 19 16:13:21.325 INFO [stderr]     |         |
Dec 19 16:13:21.325 INFO [stderr]     |         help: remove this `mut`
Dec 19 16:13:21.325 INFO [stderr] 
Dec 19 16:13:21.325 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.325 INFO [stderr]    --> src/main.rs:130:9
Dec 19 16:13:21.325 INFO [stderr]     |
Dec 19 16:13:21.325 INFO [stderr] 130 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.325 INFO [stderr]     |         ----^^^^^^
Dec 19 16:13:21.325 INFO [stderr]     |         |
Dec 19 16:13:21.325 INFO [stderr]     |         help: remove this `mut`
Dec 19 16:13:21.325 INFO [stderr] 
Dec 19 16:13:21.325 INFO [stderr] warning: variable does not need to be mutable
Dec 19 16:13:21.325 INFO [stderr]    --> src/main.rs:137:9
Dec 19 16:13:21.325 INFO [stderr]     |
Dec 19 16:13:21.325 INFO [stderr] 137 |     let mut sample = Sample { key: 1 };
Dec 19 16:13:21.325 INFO [stderr]     |         ----^^^^^^
Dec 19 16:13:21.325 INFO [stderr]     |         |
Dec 19 16:13:21.325 INFO [stderr]     |         help: remove this `mut`
Dec 19 16:13:21.325 INFO [stderr] 
Dec 19 16:13:21.325 INFO [stderr] warning: field is never used: `key`
Dec 19 16:13:21.325 INFO [stderr]  --> src/main.rs:2:3
Dec 19 16:13:21.325 INFO [stderr]   |
Dec 19 16:13:21.325 INFO [stderr] 2 |   key: i32,
Dec 19 16:13:21.326 INFO [stderr]   |   ^^^^^^^^
Dec 19 16:13:21.326 INFO [stderr]   |
Dec 19 16:13:21.326 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 19 16:13:21.326 INFO [stderr] 
Dec 19 16:13:21.326 INFO [stderr] warning: function is never used: `taking_mutable_sample`
Dec 19 16:13:21.326 INFO [stderr]   --> src/main.rs:11:1
Dec 19 16:13:21.326 INFO [stderr]    |
Dec 19 16:13:21.326 INFO [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {}
Dec 19 16:13:21.326 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 16:13:21.326 INFO [stderr] 
Dec 19 16:13:21.327 INFO [stderr] warning: function is never used: `mutable_binding_function_calls`
Dec 19 16:13:21.327 INFO [stderr]   --> src/main.rs:42:1
Dec 19 16:13:21.327 INFO [stderr]    |
Dec 19 16:13:21.327 INFO [stderr] 42 | fn mutable_binding_function_calls() {
Dec 19 16:13:21.327 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 16:13:21.327 INFO [stderr] 
Dec 19 16:13:21.349 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.23s
Dec 19 16:13:21.872 INFO running `"docker" "inspect" "bfde46c775b6266510d05a679718b6c285b020546961ea46288f3d36468615a7"`
Dec 19 16:13:22.162 INFO running `"docker" "rm" "-f" "bfde46c775b6266510d05a679718b6c285b020546961ea46288f3d36468615a7"`
Dec 19 16:13:22.458 INFO [stdout] bfde46c775b6266510d05a679718b6c285b020546961ea46288f3d36468615a7