[INFO] updating cached repository a7p/learn-rust-stringmixer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/a7p/learn-rust-stringmixer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/a7p/learn-rust-stringmixer" "work/ex/beta-1.37-6/sources/1.36.0/gh/a7p/learn-rust-stringmixer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/a7p/learn-rust-stringmixer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/a7p/learn-rust-stringmixer" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/a7p/learn-rust-stringmixer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/a7p/learn-rust-stringmixer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fcb40481b878e6596a5284902fa4cf1a2a04252e
[INFO] sha for GitHub repo a7p/learn-rust-stringmixer: fcb40481b878e6596a5284902fa4cf1a2a04252e
[INFO] validating manifest of a7p/learn-rust-stringmixer on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of a7p/learn-rust-stringmixer on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing a7p/learn-rust-stringmixer
[INFO] finished frobbing a7p/learn-rust-stringmixer
[INFO] frobbed toml for a7p/learn-rust-stringmixer written to work/ex/beta-1.37-6/sources/1.36.0/gh/a7p/learn-rust-stringmixer/Cargo.toml
[INFO] started frobbing a7p/learn-rust-stringmixer
[INFO] finished frobbing a7p/learn-rust-stringmixer
[INFO] frobbed toml for a7p/learn-rust-stringmixer written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/a7p/learn-rust-stringmixer/Cargo.toml
[INFO] crate a7p/learn-rust-stringmixer already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/a7p/learn-rust-stringmixer/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing a7p/learn-rust-stringmixer against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/a7p/learn-rust-stringmixer:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 88ff5bd4d5d7f395980ad196df918c4dad5fdf60748578390e8463b5d8ae32e7
[INFO] running `"docker" "start" "-a" "88ff5bd4d5d7f395980ad196df918c4dad5fdf60748578390e8463b5d8ae32e7"`
[INFO] [stderr]    Compiling stringmixer v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |         let mut v = &mut g[1..l];
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.93s
[INFO] running `"docker" "inspect" "88ff5bd4d5d7f395980ad196df918c4dad5fdf60748578390e8463b5d8ae32e7"`
[INFO] running `"docker" "rm" "-f" "88ff5bd4d5d7f395980ad196df918c4dad5fdf60748578390e8463b5d8ae32e7"`
[INFO] [stdout] 88ff5bd4d5d7f395980ad196df918c4dad5fdf60748578390e8463b5d8ae32e7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/a7p/learn-rust-stringmixer:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] e0def45639159ae6beeb7d22437d39192a80c3512889c43f596507def8c61804
[INFO] running `"docker" "start" "-a" "e0def45639159ae6beeb7d22437d39192a80c3512889c43f596507def8c61804"`
[INFO] [stderr]    Compiling stringmixer v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |         let mut v = &mut g[1..l];
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
[INFO] running `"docker" "inspect" "e0def45639159ae6beeb7d22437d39192a80c3512889c43f596507def8c61804"`
[INFO] running `"docker" "rm" "-f" "e0def45639159ae6beeb7d22437d39192a80c3512889c43f596507def8c61804"`
[INFO] [stdout] e0def45639159ae6beeb7d22437d39192a80c3512889c43f596507def8c61804
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/a7p/learn-rust-stringmixer:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 443d8ba47d9962c53f36a8160b2c1ffefc9e6aee9420ca7c342fdfb14753f9d0
[INFO] running `"docker" "start" "-a" "443d8ba47d9962c53f36a8160b2c1ffefc9e6aee9420ca7c342fdfb14753f9d0"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/stringmixer-ef07f9058a23e1c7
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_same ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mixer-6dcb3a4f8ae54f84
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "443d8ba47d9962c53f36a8160b2c1ffefc9e6aee9420ca7c342fdfb14753f9d0"`
[INFO] running `"docker" "rm" "-f" "443d8ba47d9962c53f36a8160b2c1ffefc9e6aee9420ca7c342fdfb14753f9d0"`
[INFO] [stdout] 443d8ba47d9962c53f36a8160b2c1ffefc9e6aee9420ca7c342fdfb14753f9d0