[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 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-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 1f89efe5eaac18541f37ff6d32df2a8420510daa9f30338bf323c28534dd7182
[INFO] running `"docker" "start" "-a" "1f89efe5eaac18541f37ff6d32df2a8420510daa9f30338bf323c28534dd7182"`
[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 2.00s
[INFO] running `"docker" "inspect" "1f89efe5eaac18541f37ff6d32df2a8420510daa9f30338bf323c28534dd7182"`
[INFO] running `"docker" "rm" "-f" "1f89efe5eaac18541f37ff6d32df2a8420510daa9f30338bf323c28534dd7182"`
[INFO] [stdout] 1f89efe5eaac18541f37ff6d32df2a8420510daa9f30338bf323c28534dd7182
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 9e1154fec4291a456fce27989a70e7c2378e0e74ed0852962b1f606a7302f759
[INFO] running `"docker" "start" "-a" "9e1154fec4291a456fce27989a70e7c2378e0e74ed0852962b1f606a7302f759"`
[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 0.86s
[INFO] running `"docker" "inspect" "9e1154fec4291a456fce27989a70e7c2378e0e74ed0852962b1f606a7302f759"`
[INFO] running `"docker" "rm" "-f" "9e1154fec4291a456fce27989a70e7c2378e0e74ed0852962b1f606a7302f759"`
[INFO] [stdout] 9e1154fec4291a456fce27989a70e7c2378e0e74ed0852962b1f606a7302f759
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 8838ab313518ae4328714bbe5c70ec50036ea13957ed4448aff35b30e2d3a4c9
[INFO] running `"docker" "start" "-a" "8838ab313518ae4328714bbe5c70ec50036ea13957ed4448aff35b30e2d3a4c9"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/trusty-abcd97a888a51506
[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] [stderr]      Running /opt/crater/target/debug/deps/trusty-7ddacd5bad15e4fb
[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] [stderr]    Doc-tests trusty
[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" "8838ab313518ae4328714bbe5c70ec50036ea13957ed4448aff35b30e2d3a4c9"`
[INFO] running `"docker" "rm" "-f" "8838ab313518ae4328714bbe5c70ec50036ea13957ed4448aff35b30e2d3a4c9"`
[INFO] [stdout] 8838ab313518ae4328714bbe5c70ec50036ea13957ed4448aff35b30e2d3a4c9