[INFO] updating cached repository lauzi/rustree
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lauzi/rustree
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lauzi/rustree" "work/ex/beta-1.38-1/sources/1.37.0/gh/lauzi/rustree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/lauzi/rustree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lauzi/rustree" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/lauzi/rustree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/lauzi/rustree'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d6ff2f9e381164ebcd45075fbce8ea3d5a5b51fa
[INFO] sha for GitHub repo lauzi/rustree: d6ff2f9e381164ebcd45075fbce8ea3d5a5b51fa
[INFO] validating manifest of lauzi/rustree 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 lauzi/rustree 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 lauzi/rustree
[INFO] finished frobbing lauzi/rustree
[INFO] frobbed toml for lauzi/rustree written to work/ex/beta-1.38-1/sources/1.37.0/gh/lauzi/rustree/Cargo.toml
[INFO] started frobbing lauzi/rustree
[INFO] finished frobbing lauzi/rustree
[INFO] frobbed toml for lauzi/rustree written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/lauzi/rustree/Cargo.toml
[INFO] crate lauzi/rustree 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 lauzi/rustree 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-5/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/lauzi/rustree:/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] b6ca6d684f7f0205c163829f069cbf115a0011bface619ae20fa58843a849487
[INFO] running `"docker" "start" "-a" "b6ca6d684f7f0205c163829f069cbf115a0011bface619ae20fa58843a849487"`
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stderr]    Compiling colored v1.6.1
[INFO] [stderr]    Compiling rustree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:185:17
[INFO] [stderr]     |
[INFO] [stderr] 185 |             let mut is_last_iter: IsLastIterator<_> = children.drain(..).into();
[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 2.46s
[INFO] running `"docker" "inspect" "b6ca6d684f7f0205c163829f069cbf115a0011bface619ae20fa58843a849487"`
[INFO] running `"docker" "rm" "-f" "b6ca6d684f7f0205c163829f069cbf115a0011bface619ae20fa58843a849487"`
[INFO] [stdout] b6ca6d684f7f0205c163829f069cbf115a0011bface619ae20fa58843a849487
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/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/lauzi/rustree:/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] e54298e0edc45c43286fb0f5a3b6e6e27528aab28a3d31c8e211a6b9cbfc4083
[INFO] running `"docker" "start" "-a" "e54298e0edc45c43286fb0f5a3b6e6e27528aab28a3d31c8e211a6b9cbfc4083"`
[INFO] [stderr]    Compiling rustree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:185:17
[INFO] [stderr]     |
[INFO] [stderr] 185 |             let mut is_last_iter: IsLastIterator<_> = children.drain(..).into();
[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 0.56s
[INFO] running `"docker" "inspect" "e54298e0edc45c43286fb0f5a3b6e6e27528aab28a3d31c8e211a6b9cbfc4083"`
[INFO] running `"docker" "rm" "-f" "e54298e0edc45c43286fb0f5a3b6e6e27528aab28a3d31c8e211a6b9cbfc4083"`
[INFO] [stdout] e54298e0edc45c43286fb0f5a3b6e6e27528aab28a3d31c8e211a6b9cbfc4083
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/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/lauzi/rustree:/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] ecfd21ef310e5e0fef8943ea1f7958ec49fb8674103d35d1bf66b93d16075792
[INFO] running `"docker" "start" "-a" "ecfd21ef310e5e0fef8943ea1f7958ec49fb8674103d35d1bf66b93d16075792"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rustree-518f864fb0ec5f86
[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" "ecfd21ef310e5e0fef8943ea1f7958ec49fb8674103d35d1bf66b93d16075792"`
[INFO] running `"docker" "rm" "-f" "ecfd21ef310e5e0fef8943ea1f7958ec49fb8674103d35d1bf66b93d16075792"`
[INFO] [stdout] ecfd21ef310e5e0fef8943ea1f7958ec49fb8674103d35d1bf66b93d16075792