Dec 05 16:27:18.250 INFO testing limitLiu/learn-rust-by-rust-book against master#906deae0790bd18681b937fe9a141a3c26cf1855 for pr-56514
Dec 05 16:27:18.250 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-6/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-alt build --frozen" "-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 05 16:27:18.647 INFO [stdout] 92b864098f180d12847fa4e81d0e46c089c61eac70fe5f06e3f6c5dd1903bc2b
Dec 05 16:27:18.651 INFO running `"docker" "start" "-a" "92b864098f180d12847fa4e81d0e46c089c61eac70fe5f06e3f6c5dd1903bc2b"`
Dec 05 16:27:19.837 INFO [stderr] usermod: no changes
Dec 05 16:27:19.908 INFO [stderr]    Compiling learn-rs v0.1.0 (/source)
Dec 05 16:27:20.460 INFO [stderr] warning: unused variable: `s`
Dec 05 16:27:20.460 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:2:13
Dec 05 16:27:20.460 INFO [stderr]   |
Dec 05 16:27:20.460 INFO [stderr] 2 |     let mut s = String::new();
Dec 05 16:27:20.460 INFO [stderr]   |             ^ help: consider using `_s` instead
Dec 05 16:27:20.460 INFO [stderr]   |
Dec 05 16:27:20.460 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 05 16:27:20.460 INFO [stderr] 
Dec 05 16:27:20.460 INFO [stderr] warning: unused variable: `s`
Dec 05 16:27:20.460 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:4:9
Dec 05 16:27:20.460 INFO [stderr]   |
Dec 05 16:27:20.460 INFO [stderr] 4 |     let s = data.to_string();
Dec 05 16:27:20.460 INFO [stderr]   |         ^ help: consider using `_s` instead
Dec 05 16:27:20.460 INFO [stderr] 
Dec 05 16:27:20.460 INFO [stderr] warning: unused variable: `s`
Dec 05 16:27:20.460 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:5:9
Dec 05 16:27:20.460 INFO [stderr]   |
Dec 05 16:27:20.460 INFO [stderr] 5 |     let s = "initial contents".to_string();
Dec 05 16:27:20.460 INFO [stderr]   |         ^ help: consider using `_s` instead
Dec 05 16:27:20.460 INFO [stderr] 
Dec 05 16:27:20.460 INFO [stderr] warning: unused variable: `s`
Dec 05 16:27:20.461 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:6:9
Dec 05 16:27:20.461 INFO [stderr]   |
Dec 05 16:27:20.461 INFO [stderr] 6 |     let s = String::from(data);
Dec 05 16:27:20.461 INFO [stderr]   |         ^ help: consider using `_s` instead
Dec 05 16:27:20.461 INFO [stderr] 
Dec 05 16:27:20.520 INFO [stderr] warning: variable does not need to be mutable
Dec 05 16:27:20.520 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:2:9
Dec 05 16:27:20.520 INFO [stderr]   |
Dec 05 16:27:20.520 INFO [stderr] 2 |     let mut s = String::new();
Dec 05 16:27:20.520 INFO [stderr]   |         ----^
Dec 05 16:27:20.520 INFO [stderr]   |         |
Dec 05 16:27:20.520 INFO [stderr]   |         help: remove this `mut`
Dec 05 16:27:20.520 INFO [stderr]   |
Dec 05 16:27:20.520 INFO [stderr]   = note: #[warn(unused_mut)] on by default
Dec 05 16:27:20.520 INFO [stderr] 
Dec 05 16:27:21.712 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.85s
Dec 05 16:27:21.712 INFO [stderr] su: No module specific data is present
Dec 05 16:27:22.184 INFO running `"docker" "inspect" "92b864098f180d12847fa4e81d0e46c089c61eac70fe5f06e3f6c5dd1903bc2b"`
Dec 05 16:27:22.347 INFO running `"docker" "rm" "-f" "92b864098f180d12847fa4e81d0e46c089c61eac70fe5f06e3f6c5dd1903bc2b"`
Dec 05 16:27:22.436 INFO [stdout] 92b864098f180d12847fa4e81d0e46c089c61eac70fe5f06e3f6c5dd1903bc2b
Dec 05 16:27:22.446 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-6/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-alt test --frozen --no-run" "-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 05 16:27:22.953 INFO [stdout] 55f8e93ad14a82973702ce3542a56393bee941f626a52da5091320754c0fa3da
Dec 05 16:27:22.958 INFO running `"docker" "start" "-a" "55f8e93ad14a82973702ce3542a56393bee941f626a52da5091320754c0fa3da"`
Dec 05 16:27:23.860 INFO [stderr] usermod: no changes
Dec 05 16:27:23.900 INFO [stderr]    Compiling learn-rs v0.1.0 (/source)
Dec 05 16:27:24.359 INFO [stderr] warning: unused variable: `s`
Dec 05 16:27:24.359 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:2:13
Dec 05 16:27:24.359 INFO [stderr]   |
Dec 05 16:27:24.359 INFO [stderr] 2 |     let mut s = String::new();
Dec 05 16:27:24.359 INFO [stderr]   |             ^ help: consider using `_s` instead
Dec 05 16:27:24.359 INFO [stderr]   |
Dec 05 16:27:24.359 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 05 16:27:24.359 INFO [stderr] 
Dec 05 16:27:24.359 INFO [stderr] warning: unused variable: `s`
Dec 05 16:27:24.359 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:4:9
Dec 05 16:27:24.359 INFO [stderr]   |
Dec 05 16:27:24.359 INFO [stderr] 4 |     let s = data.to_string();
Dec 05 16:27:24.359 INFO [stderr]   |         ^ help: consider using `_s` instead
Dec 05 16:27:24.359 INFO [stderr] 
Dec 05 16:27:24.359 INFO [stderr] warning: unused variable: `s`
Dec 05 16:27:24.359 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:5:9
Dec 05 16:27:24.359 INFO [stderr]   |
Dec 05 16:27:24.359 INFO [stderr] 5 |     let s = "initial contents".to_string();
Dec 05 16:27:24.359 INFO [stderr]   |         ^ help: consider using `_s` instead
Dec 05 16:27:24.359 INFO [stderr] 
Dec 05 16:27:24.359 INFO [stderr] warning: unused variable: `s`
Dec 05 16:27:24.359 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:6:9
Dec 05 16:27:24.359 INFO [stderr]   |
Dec 05 16:27:24.359 INFO [stderr] 6 |     let s = String::from(data);
Dec 05 16:27:24.359 INFO [stderr]   |         ^ help: consider using `_s` instead
Dec 05 16:27:24.359 INFO [stderr] 
Dec 05 16:27:24.424 INFO [stderr] warning: variable does not need to be mutable
Dec 05 16:27:24.424 INFO [stderr]  --> src/_5_common_collections/_2_strings.rs:2:9
Dec 05 16:27:24.424 INFO [stderr]   |
Dec 05 16:27:24.424 INFO [stderr] 2 |     let mut s = String::new();
Dec 05 16:27:24.424 INFO [stderr]   |         ----^
Dec 05 16:27:24.424 INFO [stderr]   |         |
Dec 05 16:27:24.424 INFO [stderr]   |         help: remove this `mut`
Dec 05 16:27:24.424 INFO [stderr]   |
Dec 05 16:27:24.425 INFO [stderr]   = note: #[warn(unused_mut)] on by default
Dec 05 16:27:24.425 INFO [stderr] 
Dec 05 16:27:24.793 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
Dec 05 16:27:24.795 INFO [stderr] su: No module specific data is present
Dec 05 16:27:25.666 INFO running `"docker" "inspect" "55f8e93ad14a82973702ce3542a56393bee941f626a52da5091320754c0fa3da"`
Dec 05 16:27:26.032 INFO running `"docker" "rm" "-f" "55f8e93ad14a82973702ce3542a56393bee941f626a52da5091320754c0fa3da"`
Dec 05 16:27:26.380 INFO [stdout] 55f8e93ad14a82973702ce3542a56393bee941f626a52da5091320754c0fa3da
Dec 05 16:27:26.388 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-6/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-alt test --frozen" "-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 05 16:27:26.876 INFO [stdout] 2141da2ac21210e0403555f9af03ecec26e3eeee8803863770593f5ae400db41
Dec 05 16:27:26.878 INFO running `"docker" "start" "-a" "2141da2ac21210e0403555f9af03ecec26e3eeee8803863770593f5ae400db41"`
Dec 05 16:27:28.082 INFO [stderr] usermod: no changes
Dec 05 16:27:28.136 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
Dec 05 16:27:28.143 INFO [stderr]      Running /target/debug/deps/learn_rs-64c6c3225511ad52
Dec 05 16:27:28.152 INFO [stderr] su: No module specific data is present
Dec 05 16:27:28.152 INFO [stdout] 
Dec 05 16:27:28.152 INFO [stdout] running 0 tests
Dec 05 16:27:28.152 INFO [stdout] 
Dec 05 16:27:28.152 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 05 16:27:28.152 INFO [stdout] 
Dec 05 16:27:28.848 INFO running `"docker" "inspect" "2141da2ac21210e0403555f9af03ecec26e3eeee8803863770593f5ae400db41"`
Dec 05 16:27:29.172 INFO running `"docker" "rm" "-f" "2141da2ac21210e0403555f9af03ecec26e3eeee8803863770593f5ae400db41"`
Dec 05 16:27:29.589 INFO [stdout] 2141da2ac21210e0403555f9af03ecec26e3eeee8803863770593f5ae400db41