Dec 11 17:36:02.745 INFO checking hardvain/rust-practice against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 17:36:02.745 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-4/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 11 17:36:03.180 INFO [stdout] d21deaddecb2698f88bc28ee27ff1c3d6736abe8117bf3bbdcaf08403ce6241c
Dec 11 17:36:03.188 INFO running `"docker" "start" "-a" "d21deaddecb2698f88bc28ee27ff1c3d6736abe8117bf3bbdcaf08403ce6241c"`
Dec 11 17:36:04.405 INFO [stderr] usermod: no changes
Dec 11 17:36:04.472 INFO [stderr]     Checking practice v0.1.0 (/source)
Dec 11 17:36:05.016 INFO [stderr] warning: unused variable: `sample`
Dec 11 17:36:05.016 INFO [stderr]  --> src/main.rs:9:24
Dec 11 17:36:05.016 INFO [stderr]   |
Dec 11 17:36:05.016 INFO [stderr] 9 | fn taking_owned_sample(sample: Sample) {}
Dec 11 17:36:05.016 INFO [stderr]   |                        ^^^^^^ help: consider using `_sample` instead
Dec 11 17:36:05.016 INFO [stderr]   |
Dec 11 17:36:05.016 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 11 17:36:05.016 INFO [stderr] 
Dec 11 17:36:05.016 INFO [stderr] warning: unused variable: `sample`
Dec 11 17:36:05.016 INFO [stderr]   --> src/main.rs:10:25
Dec 11 17:36:05.016 INFO [stderr]    |
Dec 11 17:36:05.016 INFO [stderr] 10 | fn taking_shared_sample(sample: &Sample) {}
Dec 11 17:36:05.016 INFO [stderr]    |                         ^^^^^^ help: consider using `_sample` instead
Dec 11 17:36:05.016 INFO [stderr] 
Dec 11 17:36:05.016 INFO [stderr] warning: unused variable: `sample`
Dec 11 17:36:05.016 INFO [stderr]   --> src/main.rs:11:26
Dec 11 17:36:05.016 INFO [stderr]    |
Dec 11 17:36:05.017 INFO [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {}
Dec 11 17:36:05.017 INFO [stderr]    |                          ^^^^^^ help: consider using `_sample` instead
Dec 11 17:36:05.017 INFO [stderr] 
Dec 11 17:36:05.017 INFO [stderr] warning: unused variable: `sample`
Dec 11 17:36:05.017 INFO [stderr]   --> src/main.rs:37:9
Dec 11 17:36:05.020 INFO [stderr]    |
Dec 11 17:36:05.020 INFO [stderr] 37 |     let sample = Sample { key: 1 };
Dec 11 17:36:05.020 INFO [stderr]    |         ^^^^^^ help: consider using `_sample` instead
Dec 11 17:36:05.020 INFO [stderr] 
Dec 11 17:36:05.020 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.020 INFO [stderr]   --> src/main.rs:44:9
Dec 11 17:36:05.020 INFO [stderr]    |
Dec 11 17:36:05.020 INFO [stderr] 44 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.020 INFO [stderr]    |         ----^^^^^^
Dec 11 17:36:05.020 INFO [stderr]    |         |
Dec 11 17:36:05.020 INFO [stderr]    |         help: remove this `mut`
Dec 11 17:36:05.020 INFO [stderr]    |
Dec 11 17:36:05.020 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 11 17:36:05.020 INFO [stderr] 
Dec 11 17:36:05.020 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.020 INFO [stderr]   --> src/main.rs:60:9
Dec 11 17:36:05.021 INFO [stderr]    |
Dec 11 17:36:05.021 INFO [stderr] 60 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.021 INFO [stderr]    |         ----^^^^^^
Dec 11 17:36:05.021 INFO [stderr]    |         |
Dec 11 17:36:05.021 INFO [stderr]    |         help: remove this `mut`
Dec 11 17:36:05.021 INFO [stderr] 
Dec 11 17:36:05.021 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.021 INFO [stderr]    --> src/main.rs:113:9
Dec 11 17:36:05.021 INFO [stderr]     |
Dec 11 17:36:05.021 INFO [stderr] 113 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.021 INFO [stderr]     |         ----^^^^^^
Dec 11 17:36:05.021 INFO [stderr]     |         |
Dec 11 17:36:05.021 INFO [stderr]     |         help: remove this `mut`
Dec 11 17:36:05.021 INFO [stderr] 
Dec 11 17:36:05.021 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.021 INFO [stderr]    --> src/main.rs:121:9
Dec 11 17:36:05.021 INFO [stderr]     |
Dec 11 17:36:05.021 INFO [stderr] 121 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.021 INFO [stderr]     |         ----^^^^^^
Dec 11 17:36:05.021 INFO [stderr]     |         |
Dec 11 17:36:05.021 INFO [stderr]     |         help: remove this `mut`
Dec 11 17:36:05.021 INFO [stderr] 
Dec 11 17:36:05.021 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.021 INFO [stderr]    --> src/main.rs:130:9
Dec 11 17:36:05.021 INFO [stderr]     |
Dec 11 17:36:05.021 INFO [stderr] 130 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.021 INFO [stderr]     |         ----^^^^^^
Dec 11 17:36:05.021 INFO [stderr]     |         |
Dec 11 17:36:05.021 INFO [stderr]     |         help: remove this `mut`
Dec 11 17:36:05.021 INFO [stderr] 
Dec 11 17:36:05.021 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.021 INFO [stderr]    --> src/main.rs:137:9
Dec 11 17:36:05.021 INFO [stderr]     |
Dec 11 17:36:05.021 INFO [stderr] 137 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.021 INFO [stderr]     |         ----^^^^^^
Dec 11 17:36:05.021 INFO [stderr]     |         |
Dec 11 17:36:05.021 INFO [stderr]     |         help: remove this `mut`
Dec 11 17:36:05.021 INFO [stderr] 
Dec 11 17:36:05.021 INFO [stderr] warning: field is never used: `key`
Dec 11 17:36:05.021 INFO [stderr]  --> src/main.rs:2:3
Dec 11 17:36:05.021 INFO [stderr]   |
Dec 11 17:36:05.021 INFO [stderr] 2 |   key: i32,
Dec 11 17:36:05.021 INFO [stderr]   |   ^^^^^^^^
Dec 11 17:36:05.021 INFO [stderr]   |
Dec 11 17:36:05.021 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 11 17:36:05.021 INFO [stderr] 
Dec 11 17:36:05.021 INFO [stderr] warning: function is never used: `taking_mutable_sample`
Dec 11 17:36:05.021 INFO [stderr]   --> src/main.rs:11:1
Dec 11 17:36:05.021 INFO [stderr]    |
Dec 11 17:36:05.021 INFO [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {}
Dec 11 17:36:05.021 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 17:36:05.021 INFO [stderr] 
Dec 11 17:36:05.021 INFO [stderr] warning: function is never used: `mutable_binding_function_calls`
Dec 11 17:36:05.021 INFO [stderr]   --> src/main.rs:42:1
Dec 11 17:36:05.021 INFO [stderr]    |
Dec 11 17:36:05.021 INFO [stderr] 42 | fn mutable_binding_function_calls() {
Dec 11 17:36:05.021 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 17:36:05.021 INFO [stderr] 
Dec 11 17:36:05.108 INFO [stderr] warning: unused variable: `sample`
Dec 11 17:36:05.108 INFO [stderr]  --> src/main.rs:9:24
Dec 11 17:36:05.108 INFO [stderr]   |
Dec 11 17:36:05.108 INFO [stderr] 9 | fn taking_owned_sample(sample: Sample) {}
Dec 11 17:36:05.108 INFO [stderr]   |                        ^^^^^^ help: consider using `_sample` instead
Dec 11 17:36:05.108 INFO [stderr]   |
Dec 11 17:36:05.108 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 11 17:36:05.108 INFO [stderr] 
Dec 11 17:36:05.108 INFO [stderr] warning: unused variable: `sample`
Dec 11 17:36:05.108 INFO [stderr]   --> src/main.rs:10:25
Dec 11 17:36:05.108 INFO [stderr]    |
Dec 11 17:36:05.108 INFO [stderr] 10 | fn taking_shared_sample(sample: &Sample) {}
Dec 11 17:36:05.108 INFO [stderr]    |                         ^^^^^^ help: consider using `_sample` instead
Dec 11 17:36:05.108 INFO [stderr] 
Dec 11 17:36:05.108 INFO [stderr] warning: unused variable: `sample`
Dec 11 17:36:05.108 INFO [stderr]   --> src/main.rs:11:26
Dec 11 17:36:05.108 INFO [stderr]    |
Dec 11 17:36:05.108 INFO [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {}
Dec 11 17:36:05.108 INFO [stderr]    |                          ^^^^^^ help: consider using `_sample` instead
Dec 11 17:36:05.108 INFO [stderr] 
Dec 11 17:36:05.108 INFO [stderr] warning: unused variable: `sample`
Dec 11 17:36:05.108 INFO [stderr]   --> src/main.rs:37:9
Dec 11 17:36:05.108 INFO [stderr]    |
Dec 11 17:36:05.108 INFO [stderr] 37 |     let sample = Sample { key: 1 };
Dec 11 17:36:05.108 INFO [stderr]    |         ^^^^^^ help: consider using `_sample` instead
Dec 11 17:36:05.108 INFO [stderr] 
Dec 11 17:36:05.108 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.108 INFO [stderr]   --> src/main.rs:44:9
Dec 11 17:36:05.108 INFO [stderr]    |
Dec 11 17:36:05.108 INFO [stderr] 44 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.108 INFO [stderr]    |         ----^^^^^^
Dec 11 17:36:05.108 INFO [stderr]    |         |
Dec 11 17:36:05.108 INFO [stderr]    |         help: remove this `mut`
Dec 11 17:36:05.108 INFO [stderr]    |
Dec 11 17:36:05.108 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 11 17:36:05.108 INFO [stderr] 
Dec 11 17:36:05.108 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.108 INFO [stderr]   --> src/main.rs:60:9
Dec 11 17:36:05.108 INFO [stderr]    |
Dec 11 17:36:05.109 INFO [stderr] 60 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.109 INFO [stderr]    |         ----^^^^^^
Dec 11 17:36:05.109 INFO [stderr]    |         |
Dec 11 17:36:05.109 INFO [stderr]    |         help: remove this `mut`
Dec 11 17:36:05.109 INFO [stderr] 
Dec 11 17:36:05.109 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.109 INFO [stderr]    --> src/main.rs:113:9
Dec 11 17:36:05.109 INFO [stderr]     |
Dec 11 17:36:05.109 INFO [stderr] 113 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.109 INFO [stderr]     |         ----^^^^^^
Dec 11 17:36:05.109 INFO [stderr]     |         |
Dec 11 17:36:05.109 INFO [stderr]     |         help: remove this `mut`
Dec 11 17:36:05.109 INFO [stderr] 
Dec 11 17:36:05.109 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.109 INFO [stderr]    --> src/main.rs:121:9
Dec 11 17:36:05.109 INFO [stderr]     |
Dec 11 17:36:05.109 INFO [stderr] 121 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.109 INFO [stderr]     |         ----^^^^^^
Dec 11 17:36:05.109 INFO [stderr]     |         |
Dec 11 17:36:05.109 INFO [stderr]     |         help: remove this `mut`
Dec 11 17:36:05.109 INFO [stderr] 
Dec 11 17:36:05.109 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.109 INFO [stderr]    --> src/main.rs:130:9
Dec 11 17:36:05.109 INFO [stderr]     |
Dec 11 17:36:05.109 INFO [stderr] 130 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.109 INFO [stderr]     |         ----^^^^^^
Dec 11 17:36:05.109 INFO [stderr]     |         |
Dec 11 17:36:05.109 INFO [stderr]     |         help: remove this `mut`
Dec 11 17:36:05.109 INFO [stderr] 
Dec 11 17:36:05.110 INFO [stderr] warning: variable does not need to be mutable
Dec 11 17:36:05.110 INFO [stderr]    --> src/main.rs:137:9
Dec 11 17:36:05.110 INFO [stderr]     |
Dec 11 17:36:05.110 INFO [stderr] 137 |     let mut sample = Sample { key: 1 };
Dec 11 17:36:05.110 INFO [stderr]     |         ----^^^^^^
Dec 11 17:36:05.110 INFO [stderr]     |         |
Dec 11 17:36:05.110 INFO [stderr]     |         help: remove this `mut`
Dec 11 17:36:05.110 INFO [stderr] 
Dec 11 17:36:05.110 INFO [stderr] warning: field is never used: `key`
Dec 11 17:36:05.110 INFO [stderr]  --> src/main.rs:2:3
Dec 11 17:36:05.110 INFO [stderr]   |
Dec 11 17:36:05.110 INFO [stderr] 2 |   key: i32,
Dec 11 17:36:05.110 INFO [stderr]   |   ^^^^^^^^
Dec 11 17:36:05.110 INFO [stderr]   |
Dec 11 17:36:05.110 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 11 17:36:05.110 INFO [stderr] 
Dec 11 17:36:05.110 INFO [stderr] warning: function is never used: `taking_mutable_sample`
Dec 11 17:36:05.110 INFO [stderr]   --> src/main.rs:11:1
Dec 11 17:36:05.110 INFO [stderr]    |
Dec 11 17:36:05.110 INFO [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {}
Dec 11 17:36:05.110 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 17:36:05.110 INFO [stderr] 
Dec 11 17:36:05.110 INFO [stderr] warning: function is never used: `mutable_binding_function_calls`
Dec 11 17:36:05.110 INFO [stderr]   --> src/main.rs:42:1
Dec 11 17:36:05.110 INFO [stderr]    |
Dec 11 17:36:05.110 INFO [stderr] 42 | fn mutable_binding_function_calls() {
Dec 11 17:36:05.110 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 17:36:05.110 INFO [stderr] 
Dec 11 17:36:05.137 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.70s
Dec 11 17:36:05.144 INFO [stderr] su: No module specific data is present
Dec 11 17:36:05.790 INFO running `"docker" "inspect" "d21deaddecb2698f88bc28ee27ff1c3d6736abe8117bf3bbdcaf08403ce6241c"`
Dec 11 17:36:06.144 INFO running `"docker" "rm" "-f" "d21deaddecb2698f88bc28ee27ff1c3d6736abe8117bf3bbdcaf08403ce6241c"`
Dec 11 17:36:06.475 INFO [stdout] d21deaddecb2698f88bc28ee27ff1c3d6736abe8117bf3bbdcaf08403ce6241c