Dec 13 05:50:21.216 INFO testing robbystk/rust-by-the-book against try#aa49d8ef14939ddec0e34b346b60174a5673d48f for pr-56550
Dec 13 05:50:21.216 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-4/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56550/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/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 +aa49d8ef14939ddec0e34b346b60174a5673d48f-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 13 05:50:21.720 INFO [stdout] 0fbe673361ee0255e8e7484243f43056bc92a31441383e798309539b08aef1e6
Dec 13 05:50:21.722 INFO running `"docker" "start" "-a" "0fbe673361ee0255e8e7484243f43056bc92a31441383e798309539b08aef1e6"`
Dec 13 05:50:22.652 INFO [stderr] usermod: no changes
Dec 13 05:50:22.682 INFO [stderr]    Compiling errors v0.1.0 (/source)
Dec 13 05:50:22.883 INFO [stderr] warning: unused variable: `f`
Dec 13 05:50:22.883 INFO [stderr]  --> src/main.rs:4:9
Dec 13 05:50:22.883 INFO [stderr]   |
Dec 13 05:50:22.883 INFO [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Dec 13 05:50:22.883 INFO [stderr]   |         ^ help: consider using `_f` instead
Dec 13 05:50:22.883 INFO [stderr]   |
Dec 13 05:50:22.883 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 13 05:50:22.883 INFO [stderr] 
Dec 13 05:50:23.119 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.44s
Dec 13 05:50:23.120 INFO [stderr] su: No module specific data is present
Dec 13 05:50:23.483 INFO running `"docker" "inspect" "0fbe673361ee0255e8e7484243f43056bc92a31441383e798309539b08aef1e6"`
Dec 13 05:50:23.690 INFO running `"docker" "rm" "-f" "0fbe673361ee0255e8e7484243f43056bc92a31441383e798309539b08aef1e6"`
Dec 13 05:50:24.003 INFO [stdout] 0fbe673361ee0255e8e7484243f43056bc92a31441383e798309539b08aef1e6
Dec 13 05:50:24.004 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-4/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56550/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/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 +aa49d8ef14939ddec0e34b346b60174a5673d48f-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 13 05:50:24.457 INFO [stdout] 26eb0759f30f5fc8a52ef90a9546a639ac04f81fe0100cfb1679c0990d054c27
Dec 13 05:50:24.459 INFO running `"docker" "start" "-a" "26eb0759f30f5fc8a52ef90a9546a639ac04f81fe0100cfb1679c0990d054c27"`
Dec 13 05:50:25.475 INFO [stderr] usermod: no changes
Dec 13 05:50:25.527 INFO [stderr]    Compiling errors v0.1.0 (/source)
Dec 13 05:50:25.787 INFO [stderr] warning: unused variable: `f`
Dec 13 05:50:25.787 INFO [stderr]  --> src/main.rs:4:9
Dec 13 05:50:25.787 INFO [stderr]   |
Dec 13 05:50:25.787 INFO [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Dec 13 05:50:25.787 INFO [stderr]   |         ^ help: consider using `_f` instead
Dec 13 05:50:25.787 INFO [stderr]   |
Dec 13 05:50:25.787 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 13 05:50:25.787 INFO [stderr] 
Dec 13 05:50:26.132 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
Dec 13 05:50:26.134 INFO [stderr] su: No module specific data is present
Dec 13 05:50:26.947 INFO running `"docker" "inspect" "26eb0759f30f5fc8a52ef90a9546a639ac04f81fe0100cfb1679c0990d054c27"`
Dec 13 05:50:27.213 INFO running `"docker" "rm" "-f" "26eb0759f30f5fc8a52ef90a9546a639ac04f81fe0100cfb1679c0990d054c27"`
Dec 13 05:50:27.462 INFO [stdout] 26eb0759f30f5fc8a52ef90a9546a639ac04f81fe0100cfb1679c0990d054c27
Dec 13 05:50:27.466 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-4/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56550/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/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 +aa49d8ef14939ddec0e34b346b60174a5673d48f-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 13 05:50:27.851 INFO [stdout] 54c43c500453f8a9ae095665f454553d2f89998ca5f7716c968ce8323e084495
Dec 13 05:50:27.854 INFO running `"docker" "start" "-a" "54c43c500453f8a9ae095665f454553d2f89998ca5f7716c968ce8323e084495"`
Dec 13 05:50:29.303 INFO [stderr] usermod: no changes
Dec 13 05:50:29.383 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
Dec 13 05:50:29.383 INFO [stderr]      Running /target/debug/deps/errors-0ffe3d45cfd59a5b
Dec 13 05:50:29.387 INFO [stdout] 
Dec 13 05:50:29.387 INFO [stdout] running 0 tests
Dec 13 05:50:29.387 INFO [stdout] 
Dec 13 05:50:29.387 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 13 05:50:29.387 INFO [stdout] 
Dec 13 05:50:29.407 INFO [stderr] su: No module specific data is present
Dec 13 05:50:29.936 INFO running `"docker" "inspect" "54c43c500453f8a9ae095665f454553d2f89998ca5f7716c968ce8323e084495"`
Dec 13 05:50:30.048 INFO running `"docker" "rm" "-f" "54c43c500453f8a9ae095665f454553d2f89998ca5f7716c968ce8323e084495"`
Dec 13 05:50:30.140 INFO [stdout] 54c43c500453f8a9ae095665f454553d2f89998ca5f7716c968ce8323e084495