[INFO] crate pool 0.1.4 is already in cache
[INFO] extracting crate pool 0.1.4 into work/ex/beta-1.38-1/sources/1.37.0/reg/pool/0.1.4
[INFO] extracting crate pool 0.1.4 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pool/0.1.4
[INFO] validating manifest of pool-0.1.4 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 pool-0.1.4 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 pool-0.1.4
[INFO] removed 1 missing tests
[INFO] finished frobbing pool-0.1.4
[INFO] frobbed toml for pool-0.1.4 written to work/ex/beta-1.38-1/sources/1.37.0/reg/pool/0.1.4/Cargo.toml
[INFO] started frobbing pool-0.1.4
[INFO] removed 1 missing tests
[INFO] finished frobbing pool-0.1.4
[INFO] frobbed toml for pool-0.1.4 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pool/0.1.4/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 pool-0.1.4 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/pool/0.1.4:/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] af5451ce5190d69cfedbbb212f09a13fc214cabb4d1a89132019f732ddc80845
[INFO] running `"docker" "start" "-a" "af5451ce5190d69cfedbbb212f09a13fc214cabb4d1a89132019f732ddc80845"`
[INFO] [stderr]    Compiling pool v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:266:13
[INFO] [stderr]     |
[INFO] [stderr] 266 |         let mut idx;
[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 0.40s
[INFO] running `"docker" "inspect" "af5451ce5190d69cfedbbb212f09a13fc214cabb4d1a89132019f732ddc80845"`
[INFO] running `"docker" "rm" "-f" "af5451ce5190d69cfedbbb212f09a13fc214cabb4d1a89132019f732ddc80845"`
[INFO] [stdout] af5451ce5190d69cfedbbb212f09a13fc214cabb4d1a89132019f732ddc80845
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/pool/0.1.4:/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] 101290e29bbf3b14cab5d5f01dc5edac358db2bcd98340ff8bb7826f599cfff0
[INFO] running `"docker" "start" "-a" "101290e29bbf3b14cab5d5f01dc5edac358db2bcd98340ff8bb7826f599cfff0"`
[INFO] [stderr]    Compiling pool v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:266:13
[INFO] [stderr]     |
[INFO] [stderr] 266 |         let mut idx;
[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" "101290e29bbf3b14cab5d5f01dc5edac358db2bcd98340ff8bb7826f599cfff0"`
[INFO] running `"docker" "rm" "-f" "101290e29bbf3b14cab5d5f01dc5edac358db2bcd98340ff8bb7826f599cfff0"`
[INFO] [stdout] 101290e29bbf3b14cab5d5f01dc5edac358db2bcd98340ff8bb7826f599cfff0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/pool/0.1.4:/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] 576c88347d6126c4997fe188629666441054fe418b9ffc53fc6bda9468d7f81d
[INFO] running `"docker" "start" "-a" "576c88347d6126c4997fe188629666441054fe418b9ffc53fc6bda9468d7f81d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/pool-e76865b56b63ae1e
[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] [stderr]    Doc-tests pool
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs -  (line 10) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "576c88347d6126c4997fe188629666441054fe418b9ffc53fc6bda9468d7f81d"`
[INFO] running `"docker" "rm" "-f" "576c88347d6126c4997fe188629666441054fe418b9ffc53fc6bda9468d7f81d"`
[INFO] [stdout] 576c88347d6126c4997fe188629666441054fe418b9ffc53fc6bda9468d7f81d