[INFO] crate file_diff 1.0.0 is already in cache
[INFO] extracting crate file_diff 1.0.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/file_diff/1.0.0
[INFO] extracting crate file_diff 1.0.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/file_diff/1.0.0
[INFO] validating manifest of file_diff-1.0.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of file_diff-1.0.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing file_diff-1.0.0
[INFO] finished frobbing file_diff-1.0.0
[INFO] frobbed toml for file_diff-1.0.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/file_diff/1.0.0/Cargo.toml
[INFO] started frobbing file_diff-1.0.0
[INFO] finished frobbing file_diff-1.0.0
[INFO] frobbed toml for file_diff-1.0.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/file_diff/1.0.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing file_diff-1.0.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/file_diff/1.0.0:/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 4f31f9ef25e23a5c3a466f305a728b7c0099cb6e2d0b08a371978c02d7ab684b
[INFO] running `"docker" "start" "-a" "4f31f9ef25e23a5c3a466f305a728b7c0099cb6e2d0b08a371978c02d7ab684b"`
[INFO] [stderr]    Compiling file_diff v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let mut buff1 : &mut [u8] = &mut [0; 1024];
[INFO] [stderr]    |         ----^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 |     let mut buff2 : &mut [u8] = &mut [0; 1024];
[INFO] [stderr]    |         ----^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `"docker" "inspect" "4f31f9ef25e23a5c3a466f305a728b7c0099cb6e2d0b08a371978c02d7ab684b"`
[INFO] running `"docker" "rm" "-f" "4f31f9ef25e23a5c3a466f305a728b7c0099cb6e2d0b08a371978c02d7ab684b"`
[INFO] [stdout] 4f31f9ef25e23a5c3a466f305a728b7c0099cb6e2d0b08a371978c02d7ab684b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/file_diff/1.0.0:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] f7bf1db64205a72f278ae0ec45040e7461d37f539a5a16d71a01af3274abdfd7
[INFO] running `"docker" "start" "-a" "f7bf1db64205a72f278ae0ec45040e7461d37f539a5a16d71a01af3274abdfd7"`
[INFO] [stderr]    Compiling file_diff v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let mut buff1 : &mut [u8] = &mut [0; 1024];
[INFO] [stderr]    |         ----^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 |     let mut buff2 : &mut [u8] = &mut [0; 1024];
[INFO] [stderr]    |         ----^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `"docker" "inspect" "f7bf1db64205a72f278ae0ec45040e7461d37f539a5a16d71a01af3274abdfd7"`
[INFO] running `"docker" "rm" "-f" "f7bf1db64205a72f278ae0ec45040e7461d37f539a5a16d71a01af3274abdfd7"`
[INFO] [stdout] f7bf1db64205a72f278ae0ec45040e7461d37f539a5a16d71a01af3274abdfd7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/file_diff/1.0.0:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] cbc297131a8fc7dc5ea9e3a701f1fcf923ae955c052816320055b582c857fbc8
[INFO] running `"docker" "start" "-a" "cbc297131a8fc7dc5ea9e3a701f1fcf923ae955c052816320055b582c857fbc8"`
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] running 5 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/file_diff-2e5468d2be713783
[INFO] [stdout] test tests::diff_the_same_text_file ... ok
[INFO] [stderr]    Doc-tests file_diff
[INFO] [stdout] test tests::diff_the_same_binary_file ... ok
[INFO] [stdout] test tests::diff_identical_binary_files ... ok
[INFO] [stdout] test tests::diff_different_text_files ... ok
[INFO] [stdout] test tests::diff_different_binary_files ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs -  (line 14) ... ok
[INFO] [stdout] test src/lib.rs -  (line 33) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "cbc297131a8fc7dc5ea9e3a701f1fcf923ae955c052816320055b582c857fbc8"`
[INFO] running `"docker" "rm" "-f" "cbc297131a8fc7dc5ea9e3a701f1fcf923ae955c052816320055b582c857fbc8"`
[INFO] [stdout] cbc297131a8fc7dc5ea9e3a701f1fcf923ae955c052816320055b582c857fbc8