Dec 11 14:45:16.078 INFO checking limitLiu/learn-rust-by-rust-book against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 14:45:16.078 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-6/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/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 14:45:16.438 INFO [stdout] 06a7d5f12e77452446c16777fa1e41e6fae8493459a2925c28a3b1972acb2c53
Dec 11 14:45:16.442 INFO running `"docker" "start" "-a" "06a7d5f12e77452446c16777fa1e41e6fae8493459a2925c28a3b1972acb2c53"`
Dec 11 14:45:18.082 INFO [stderr] usermod: no changes
Dec 11 14:45:18.173 INFO [stderr]     Checking learn-rs v0.1.0 (/source)
Dec 11 14:45:19.039 INFO [stderr] warning: unused variable: `add_one_v2`
Dec 11 14:45:19.039 INFO [stderr]   --> src/_7_functional_features/_1_closures.rs:12:9
Dec 11 14:45:19.039 INFO [stderr]    |
Dec 11 14:45:19.039 INFO [stderr] 12 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
Dec 11 14:45:19.039 INFO [stderr]    |         ^^^^^^^^^^ help: consider using `_add_one_v2` instead
Dec 11 14:45:19.039 INFO [stderr]    |
Dec 11 14:45:19.039 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 14:45:19.039 INFO [stderr] 
Dec 11 14:45:19.152 INFO [stderr] warning: function is never used: `add_one_v1`
Dec 11 14:45:19.152 INFO [stderr]   --> src/_7_functional_features/_1_closures.rs:11:5
Dec 11 14:45:19.152 INFO [stderr]    |
Dec 11 14:45:19.152 INFO [stderr] 11 |     fn add_one_v1(x: u32) -> u32 { x + 1 }
Dec 11 14:45:19.152 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 14:45:19.152 INFO [stderr]    |
Dec 11 14:45:19.152 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 11 14:45:19.152 INFO [stderr] 
Dec 11 14:45:19.306 INFO [stderr] warning: unused variable: `add_one_v2`
Dec 11 14:45:19.306 INFO [stderr]   --> src/_7_functional_features/_1_closures.rs:12:9
Dec 11 14:45:19.306 INFO [stderr]    |
Dec 11 14:45:19.306 INFO [stderr] 12 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
Dec 11 14:45:19.306 INFO [stderr]    |         ^^^^^^^^^^ help: consider using `_add_one_v2` instead
Dec 11 14:45:19.306 INFO [stderr]    |
Dec 11 14:45:19.306 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 14:45:19.306 INFO [stderr] 
Dec 11 14:45:19.306 INFO [stderr] warning: unused variable: `v1`
Dec 11 14:45:19.306 INFO [stderr]   --> src/_7_functional_features/_1_closures.rs:68:9
Dec 11 14:45:19.306 INFO [stderr]    |
Dec 11 14:45:19.306 INFO [stderr] 68 |     let v1 = c.value(1);
Dec 11 14:45:19.306 INFO [stderr]    |         ^^ help: consider using `_v1` instead
Dec 11 14:45:19.306 INFO [stderr] 
Dec 11 14:45:19.440 INFO [stderr] warning: function is never used: `add_one_v1`
Dec 11 14:45:19.440 INFO [stderr]   --> src/_7_functional_features/_1_closures.rs:11:5
Dec 11 14:45:19.440 INFO [stderr]    |
Dec 11 14:45:19.440 INFO [stderr] 11 |     fn add_one_v1(x: u32) -> u32 { x + 1 }
Dec 11 14:45:19.440 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 14:45:19.440 INFO [stderr]    |
Dec 11 14:45:19.440 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 11 14:45:19.440 INFO [stderr] 
Dec 11 14:45:19.476 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.36s
Dec 11 14:45:19.478 INFO [stderr] su: No module specific data is present
Dec 11 14:45:20.100 INFO running `"docker" "inspect" "06a7d5f12e77452446c16777fa1e41e6fae8493459a2925c28a3b1972acb2c53"`
Dec 11 14:45:20.464 INFO running `"docker" "rm" "-f" "06a7d5f12e77452446c16777fa1e41e6fae8493459a2925c28a3b1972acb2c53"`
Dec 11 14:45:20.773 INFO [stdout] 06a7d5f12e77452446c16777fa1e41e6fae8493459a2925c28a3b1972acb2c53