[INFO] crate ordered-permutation 0.1.1 is already in cache
[INFO] extracting crate ordered-permutation 0.1.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/ordered-permutation/0.1.1
[INFO] extracting crate ordered-permutation 0.1.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/ordered-permutation/0.1.1
[INFO] validating manifest of ordered-permutation-0.1.1 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ordered-permutation-0.1.1 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ordered-permutation-0.1.1
[INFO] finished frobbing ordered-permutation-0.1.1
[INFO] frobbed toml for ordered-permutation-0.1.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/ordered-permutation/0.1.1/Cargo.toml
[INFO] started frobbing ordered-permutation-0.1.1
[INFO] finished frobbing ordered-permutation-0.1.1
[INFO] frobbed toml for ordered-permutation-0.1.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/ordered-permutation/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ordered-permutation-0.1.1 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/ordered-permutation/0.1.1:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 1835447e6793ff24685e661402c801753c0c39c407427bc41d614ecbe9f2723d
[INFO] running `"docker" "start" "-a" "1835447e6793ff24685e661402c801753c0c39c407427bc41d614ecbe9f2723d"`
[INFO] [stderr]    Compiling ordered-permutation v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:64:17
[INFO] [stderr]    |
[INFO] [stderr] 64 |             for mut node in self.children.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 0.35s
[INFO] running `"docker" "inspect" "1835447e6793ff24685e661402c801753c0c39c407427bc41d614ecbe9f2723d"`
[INFO] running `"docker" "rm" "-f" "1835447e6793ff24685e661402c801753c0c39c407427bc41d614ecbe9f2723d"`
[INFO] [stdout] 1835447e6793ff24685e661402c801753c0c39c407427bc41d614ecbe9f2723d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/ordered-permutation/0.1.1:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 531be5a6692a042f6887e3ab060296ce5aeb49290ed64b3e7265b20fed9bedb2
[INFO] running `"docker" "start" "-a" "531be5a6692a042f6887e3ab060296ce5aeb49290ed64b3e7265b20fed9bedb2"`
[INFO] [stderr]    Compiling ordered-permutation v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:64:17
[INFO] [stderr]    |
[INFO] [stderr] 64 |             for mut node in self.children.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 0.52s
[INFO] running `"docker" "inspect" "531be5a6692a042f6887e3ab060296ce5aeb49290ed64b3e7265b20fed9bedb2"`
[INFO] running `"docker" "rm" "-f" "531be5a6692a042f6887e3ab060296ce5aeb49290ed64b3e7265b20fed9bedb2"`
[INFO] [stdout] 531be5a6692a042f6887e3ab060296ce5aeb49290ed64b3e7265b20fed9bedb2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/ordered-permutation/0.1.1:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] fc437fdd17d8d96de95ec43b43e5ded0d8f4fe293cfa9c9fbc296c1843828ea2
[INFO] running `"docker" "start" "-a" "fc437fdd17d8d96de95ec43b43e5ded0d8f4fe293cfa9c9fbc296c1843828ea2"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/ordered_permutation-14e2af9427a3a10a
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test unique ... ok
[INFO] [stdout] test count ... ok
[INFO] [stderr]    Doc-tests ordered-permutation
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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" "fc437fdd17d8d96de95ec43b43e5ded0d8f4fe293cfa9c9fbc296c1843828ea2"`
[INFO] running `"docker" "rm" "-f" "fc437fdd17d8d96de95ec43b43e5ded0d8f4fe293cfa9c9fbc296c1843828ea2"`
[INFO] [stdout] fc437fdd17d8d96de95ec43b43e5ded0d8f4fe293cfa9c9fbc296c1843828ea2