[INFO] updating cached repository ctm/mdck
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ctm/mdck
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ctm/mdck" "work/ex/beta-1.38-1/sources/1.37.0/gh/ctm/mdck"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ctm/mdck'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ctm/mdck" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ctm/mdck"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ctm/mdck'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7151cc6b9163d6f45026b1367bbda75af6b1676a
[INFO] sha for GitHub repo ctm/mdck: 7151cc6b9163d6f45026b1367bbda75af6b1676a
[INFO] validating manifest of ctm/mdck 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 ctm/mdck 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 ctm/mdck
[INFO] finished frobbing ctm/mdck
[INFO] frobbed toml for ctm/mdck written to work/ex/beta-1.38-1/sources/1.37.0/gh/ctm/mdck/Cargo.toml
[INFO] started frobbing ctm/mdck
[INFO] finished frobbing ctm/mdck
[INFO] frobbed toml for ctm/mdck written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ctm/mdck/Cargo.toml
[INFO] crate ctm/mdck 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 ctm/mdck 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ctm/mdck:/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] 4d3e6b4076e6712dd058977bf09f4a69e2342ed4955f48d3e35a64c423547d72
[INFO] running `"docker" "start" "-a" "4d3e6b4076e6712dd058977bf09f4a69e2342ed4955f48d3e35a64c423547d72"`
[INFO] [stderr]    Compiling bytecount v0.5.0
[INFO] [stderr]    Compiling term_size v0.3.1
[INFO] [stderr]    Compiling textwrap v0.10.0
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling structopt v0.2.14
[INFO] [stderr]    Compiling mdck v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/error.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |         let mut walkdir_err;
[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 22.02s
[INFO] running `"docker" "inspect" "4d3e6b4076e6712dd058977bf09f4a69e2342ed4955f48d3e35a64c423547d72"`
[INFO] running `"docker" "rm" "-f" "4d3e6b4076e6712dd058977bf09f4a69e2342ed4955f48d3e35a64c423547d72"`
[INFO] [stdout] 4d3e6b4076e6712dd058977bf09f4a69e2342ed4955f48d3e35a64c423547d72
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ctm/mdck:/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] 837a8ae4da2fc47f18bbf176f6c9297c26cc72717d6392f57e646b8da5d2d991
[INFO] running `"docker" "start" "-a" "837a8ae4da2fc47f18bbf176f6c9297c26cc72717d6392f57e646b8da5d2d991"`
[INFO] [stderr]    Compiling mdck v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/error.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |         let mut walkdir_err;
[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 1.52s
[INFO] running `"docker" "inspect" "837a8ae4da2fc47f18bbf176f6c9297c26cc72717d6392f57e646b8da5d2d991"`
[INFO] running `"docker" "rm" "-f" "837a8ae4da2fc47f18bbf176f6c9297c26cc72717d6392f57e646b8da5d2d991"`
[INFO] [stdout] 837a8ae4da2fc47f18bbf176f6c9297c26cc72717d6392f57e646b8da5d2d991
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ctm/mdck:/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] 854730cccd546409c3f931a87abc522061d82441eae1016d2430ef26fa44ae58
[INFO] running `"docker" "start" "-a" "854730cccd546409c3f931a87abc522061d82441eae1016d2430ef26fa44ae58"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mdck-4cca1b4b36479cf0
[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/mdck-9f06669dc852ec05
[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 mdck
[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" "854730cccd546409c3f931a87abc522061d82441eae1016d2430ef26fa44ae58"`
[INFO] running `"docker" "rm" "-f" "854730cccd546409c3f931a87abc522061d82441eae1016d2430ef26fa44ae58"`
[INFO] [stdout] 854730cccd546409c3f931a87abc522061d82441eae1016d2430ef26fa44ae58