[INFO] updating cached repository https://github.com/sirscratchalot/rustwordladder
[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] b6721e0c8e9ffd60ebade71f4b719d704c721d94
[INFO] testing sirscratchalot/rustwordladder against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsirscratchalot%2Frustwordladder" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sirscratchalot/rustwordladder 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/sirscratchalot/rustwordladder
[INFO] finished tweaking git repo https://github.com/sirscratchalot/rustwordladder
[INFO] tweaked toml for git repo https://github.com/sirscratchalot/rustwordladder written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/sirscratchalot/rustwordladder 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-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] 730b8af9c905b51d135f6da503d64a13234f678aa2a1a670499d1d4bfd3ed4c3
[INFO] running `"docker" "start" "-a" "730b8af9c905b51d135f6da503d64a13234f678aa2a1a670499d1d4bfd3ed4c3"`
[INFO] [stderr]    Compiling wordladder v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/graph/mod.rs:44:13
[INFO] [stderr]    |
[INFO] [stderr] 44 |         for mut node in self.nodes.iter_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 0.82s
[INFO] running `"docker" "inspect" "730b8af9c905b51d135f6da503d64a13234f678aa2a1a670499d1d4bfd3ed4c3"`
[INFO] running `"docker" "rm" "-f" "730b8af9c905b51d135f6da503d64a13234f678aa2a1a670499d1d4bfd3ed4c3"`
[INFO] [stdout] 730b8af9c905b51d135f6da503d64a13234f678aa2a1a670499d1d4bfd3ed4c3
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] e6c2c98776313e5d9be8083d3234c8142a0f6c63902c939f521a4651f11bcb37
[INFO] running `"docker" "start" "-a" "e6c2c98776313e5d9be8083d3234c8142a0f6c63902c939f521a4651f11bcb37"`
[INFO] [stderr]    Compiling wordladder v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `node`
[INFO] [stderr]    --> src/graph/mod.rs:198:12
[INFO] [stderr]     |
[INFO] [stderr] 198 |     for (i,node) in graph.nodes.iter().enumerate() {
[INFO] [stderr]     |            ^^^^ help: consider prefixing with an underscore: `_node`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/graph/mod.rs:44:13
[INFO] [stderr]    |
[INFO] [stderr] 44 |         for mut node in self.nodes.iter_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 0.83s
[INFO] running `"docker" "inspect" "e6c2c98776313e5d9be8083d3234c8142a0f6c63902c939f521a4651f11bcb37"`
[INFO] running `"docker" "rm" "-f" "e6c2c98776313e5d9be8083d3234c8142a0f6c63902c939f521a4651f11bcb37"`
[INFO] [stdout] e6c2c98776313e5d9be8083d3234c8142a0f6c63902c939f521a4651f11bcb37
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] 8c0737ae88729cd1c0c14a938f6e611a415e095f39ede6dbd4204478665252c2
[INFO] running `"docker" "start" "-a" "8c0737ae88729cd1c0c14a938f6e611a415e095f39ede6dbd4204478665252c2"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/wordladder-2222b6ab9b6ce6d9
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test graph::tests::test_circular ... ok
[INFO] [stdout] test graph::tests::test_longest ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "8c0737ae88729cd1c0c14a938f6e611a415e095f39ede6dbd4204478665252c2"`
[INFO] running `"docker" "rm" "-f" "8c0737ae88729cd1c0c14a938f6e611a415e095f39ede6dbd4204478665252c2"`
[INFO] [stdout] 8c0737ae88729cd1c0c14a938f6e611a415e095f39ede6dbd4204478665252c2