[INFO] crate veb-rs 0.1.1 is already in cache
[INFO] extracting crate veb-rs 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/veb-rs/0.1.1
[INFO] extracting crate veb-rs 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/veb-rs/0.1.1
[INFO] validating manifest of veb-rs-0.1.1 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 veb-rs-0.1.1 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 veb-rs-0.1.1
[INFO] finished frobbing veb-rs-0.1.1
[INFO] frobbed toml for veb-rs-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/veb-rs/0.1.1/Cargo.toml
[INFO] started frobbing veb-rs-0.1.1
[INFO] finished frobbing veb-rs-0.1.1
[INFO] frobbed toml for veb-rs-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/veb-rs/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 veb-rs-0.1.1 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/veb-rs/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] a3c5657648a81800145088ab4eb2faaa05a02298dfb5cc6db6417adeef1fe23a
[INFO] running `"docker" "start" "-a" "a3c5657648a81800145088ab4eb2faaa05a02298dfb5cc6db6417adeef1fe23a"`
[INFO] [stderr]    Compiling veb-rs v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:254:21
[INFO] [stderr]     |
[INFO] [stderr] 254 |                 let mut subtree = &mut self.children[idx as usize];
[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 0.44s
[INFO] running `"docker" "inspect" "a3c5657648a81800145088ab4eb2faaa05a02298dfb5cc6db6417adeef1fe23a"`
[INFO] running `"docker" "rm" "-f" "a3c5657648a81800145088ab4eb2faaa05a02298dfb5cc6db6417adeef1fe23a"`
[INFO] [stdout] a3c5657648a81800145088ab4eb2faaa05a02298dfb5cc6db6417adeef1fe23a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/veb-rs/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 56342be9159a5ffe20f0b0551935374519f57e37c576c6ff7b93968d0e12518d
[INFO] running `"docker" "start" "-a" "56342be9159a5ffe20f0b0551935374519f57e37c576c6ff7b93968d0e12518d"`
[INFO] [stderr]    Compiling veb-rs v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:254:21
[INFO] [stderr]     |
[INFO] [stderr] 254 |                 let mut subtree = &mut self.children[idx as usize];
[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 0.65s
[INFO] running `"docker" "inspect" "56342be9159a5ffe20f0b0551935374519f57e37c576c6ff7b93968d0e12518d"`
[INFO] running `"docker" "rm" "-f" "56342be9159a5ffe20f0b0551935374519f57e37c576c6ff7b93968d0e12518d"`
[INFO] [stdout] 56342be9159a5ffe20f0b0551935374519f57e37c576c6ff7b93968d0e12518d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/veb-rs/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 2c09bd574d187f00349cb3bc3ffeaf67ee825d72634925e4fb4e27d2d131fcb9
[INFO] running `"docker" "start" "-a" "2c09bd574d187f00349cb3bc3ffeaf67ee825d72634925e4fb4e27d2d131fcb9"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/veb_rs-e2c50623c83ca019
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test creation_fail ... ok
[INFO] [stderr]    Doc-tests veb-rs
[INFO] [stdout] test find_next ... ok
[INFO] [stdout] test insertion_and_has ... ok
[INFO] [stdout] test creation ... ok
[INFO] [stdout] test delete ... ok
[INFO] [stdout] test is_empty ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 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" "2c09bd574d187f00349cb3bc3ffeaf67ee825d72634925e4fb4e27d2d131fcb9"`
[INFO] running `"docker" "rm" "-f" "2c09bd574d187f00349cb3bc3ffeaf67ee825d72634925e4fb4e27d2d131fcb9"`
[INFO] [stdout] 2c09bd574d187f00349cb3bc3ffeaf67ee825d72634925e4fb4e27d2d131fcb9