[INFO] updating cached repository https://github.com/ffjanp/finding_cycles
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7681c5b78f8998a8c9db7cfc6a1a7de70834b09b
[INFO] testing ffjanp/finding_cycles against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fffjanp%2Ffinding_cycles" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ffjanp/finding_cycles on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ffjanp/finding_cycles
[INFO] finished tweaking git repo https://github.com/ffjanp/finding_cycles
[INFO] tweaked toml for git repo https://github.com/ffjanp/finding_cycles written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/ffjanp/finding_cycles already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 009994b55d80aed1e02c5186d705d35c21fb720e8001d0c6e2ed028dc4988ddd
[INFO] running `"docker" "start" "-a" "009994b55d80aed1e02c5186d705d35c21fb720e8001d0c6e2ed028dc4988ddd"`
[INFO] [stderr]    Compiling byteorder v1.2.7
[INFO] [stderr]    Compiling rand v0.6.3
[INFO] [stderr]    Compiling rand_os v0.1.0
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling rand_xoshiro v0.1.0
[INFO] [stderr]    Compiling finding_cycles v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:153:13
[INFO] [stderr]     |
[INFO] [stderr] 153 |         let mut length: usize = new_graph.nodes.len();
[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 9.57s
[INFO] running `"docker" "inspect" "009994b55d80aed1e02c5186d705d35c21fb720e8001d0c6e2ed028dc4988ddd"`
[INFO] running `"docker" "rm" "-f" "009994b55d80aed1e02c5186d705d35c21fb720e8001d0c6e2ed028dc4988ddd"`
[INFO] [stdout] 009994b55d80aed1e02c5186d705d35c21fb720e8001d0c6e2ed028dc4988ddd
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen" "--no-run"`
[INFO] [stdout] d943b0b425b59d9c8b39660afb5a4a78b8738d4fdd2f14f8103dedc7662977a7
[INFO] running `"docker" "start" "-a" "d943b0b425b59d9c8b39660afb5a4a78b8738d4fdd2f14f8103dedc7662977a7"`
[INFO] [stderr]    Compiling finding_cycles v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:153:13
[INFO] [stderr]     |
[INFO] [stderr] 153 |         let mut length: usize = new_graph.nodes.len();
[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 1.11s
[INFO] running `"docker" "inspect" "d943b0b425b59d9c8b39660afb5a4a78b8738d4fdd2f14f8103dedc7662977a7"`
[INFO] running `"docker" "rm" "-f" "d943b0b425b59d9c8b39660afb5a4a78b8738d4fdd2f14f8103dedc7662977a7"`
[INFO] [stdout] d943b0b425b59d9c8b39660afb5a4a78b8738d4fdd2f14f8103dedc7662977a7
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen"`
[INFO] [stdout] cd256da0f40159ad45d32d251514ef4dd40646578e9847b216d569c83bc85cc8
[INFO] running `"docker" "start" "-a" "cd256da0f40159ad45d32d251514ef4dd40646578e9847b216d569c83bc85cc8"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.13s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/finding_cycles-2338ccaa25eeaa3b
[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" "cd256da0f40159ad45d32d251514ef4dd40646578e9847b216d569c83bc85cc8"`
[INFO] running `"docker" "rm" "-f" "cd256da0f40159ad45d32d251514ef4dd40646578e9847b216d569c83bc85cc8"`
[INFO] [stdout] cd256da0f40159ad45d32d251514ef4dd40646578e9847b216d569c83bc85cc8