[INFO] updating cached repository BookOwl/trusty
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/BookOwl/trusty
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/BookOwl/trusty" "work/ex/beta-1.38-1/sources/1.37.0/gh/BookOwl/trusty"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/BookOwl/trusty'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/BookOwl/trusty" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/BookOwl/trusty"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/BookOwl/trusty'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3a48518972028db78b328e259a1efc3e570f7257
[INFO] sha for GitHub repo BookOwl/trusty: 3a48518972028db78b328e259a1efc3e570f7257
[INFO] validating manifest of BookOwl/trusty 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 BookOwl/trusty 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 BookOwl/trusty
[INFO] finished frobbing BookOwl/trusty
[INFO] frobbed toml for BookOwl/trusty written to work/ex/beta-1.38-1/sources/1.37.0/gh/BookOwl/trusty/Cargo.toml
[INFO] started frobbing BookOwl/trusty
[INFO] finished frobbing BookOwl/trusty
[INFO] frobbed toml for BookOwl/trusty written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/BookOwl/trusty/Cargo.toml
[INFO] crate BookOwl/trusty already has a lockfile, it will not be regenerated
[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 BookOwl/trusty against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/BookOwl/trusty:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 3342595d3f9f049688f0ffef850f845c519d0bca44f9e23a8956eebd2aa86ba1
[INFO] running `"docker" "start" "-a" "3342595d3f9f049688f0ffef850f845c519d0bca44f9e23a8956eebd2aa86ba1"`
[INFO] [stderr]    Compiling left-pad v1.0.1
[INFO] [stderr]    Compiling termion v1.1.4
[INFO] [stderr]    Compiling trusty v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/backend.rs:62:17
[INFO] [stderr]    |
[INFO] [stderr] 62 |             let mut buf = self.current_buffer_mut();
[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 2.43s
[INFO] running `"docker" "inspect" "3342595d3f9f049688f0ffef850f845c519d0bca44f9e23a8956eebd2aa86ba1"`
[INFO] running `"docker" "rm" "-f" "3342595d3f9f049688f0ffef850f845c519d0bca44f9e23a8956eebd2aa86ba1"`
[INFO] [stdout] 3342595d3f9f049688f0ffef850f845c519d0bca44f9e23a8956eebd2aa86ba1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/BookOwl/trusty:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] c97c1ba364e9da5c0bbe8b1da7f5a13c677d35be2d4f36c4e6d6560341832a93
[INFO] running `"docker" "start" "-a" "c97c1ba364e9da5c0bbe8b1da7f5a13c677d35be2d4f36c4e6d6560341832a93"`
[INFO] [stderr]    Compiling trusty v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/backend.rs:62:17
[INFO] [stderr]    |
[INFO] [stderr] 62 |             let mut buf = self.current_buffer_mut();
[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 1.19s
[INFO] running `"docker" "inspect" "c97c1ba364e9da5c0bbe8b1da7f5a13c677d35be2d4f36c4e6d6560341832a93"`
[INFO] running `"docker" "rm" "-f" "c97c1ba364e9da5c0bbe8b1da7f5a13c677d35be2d4f36c4e6d6560341832a93"`
[INFO] [stdout] c97c1ba364e9da5c0bbe8b1da7f5a13c677d35be2d4f36c4e6d6560341832a93
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/BookOwl/trusty:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 266c17c1682b9b6b34993e5affeeff3e4d219b8b4f1d5b314e275ebd2a67e836
[INFO] running `"docker" "start" "-a" "266c17c1682b9b6b34993e5affeeff3e4d219b8b4f1d5b314e275ebd2a67e836"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/trusty-5e39559853505581
[INFO] [stderr]      Running /opt/crater/target/debug/deps/trusty-33e28141dad964fc
[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] [stdout] 
[INFO] [stderr]    Doc-tests trusty
[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] [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" "266c17c1682b9b6b34993e5affeeff3e4d219b8b4f1d5b314e275ebd2a67e836"`
[INFO] running `"docker" "rm" "-f" "266c17c1682b9b6b34993e5affeeff3e4d219b8b4f1d5b314e275ebd2a67e836"`
[INFO] [stdout] 266c17c1682b9b6b34993e5affeeff3e4d219b8b4f1d5b314e275ebd2a67e836