[INFO] crate sliding_windows 3.0.0 is already in cache
[INFO] extracting crate sliding_windows 3.0.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/sliding_windows/3.0.0
[INFO] extracting crate sliding_windows 3.0.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/sliding_windows/3.0.0
[INFO] validating manifest of sliding_windows-3.0.0 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 sliding_windows-3.0.0 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 sliding_windows-3.0.0
[INFO] finished frobbing sliding_windows-3.0.0
[INFO] frobbed toml for sliding_windows-3.0.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/sliding_windows/3.0.0/Cargo.toml
[INFO] started frobbing sliding_windows-3.0.0
[INFO] finished frobbing sliding_windows-3.0.0
[INFO] frobbed toml for sliding_windows-3.0.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/sliding_windows/3.0.0/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] [stderr]     Blocking waiting for file lock on package cache
[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 sliding_windows-3.0.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/sliding_windows/3.0.0:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 460e8598fc2b6028c07c830de0546e27338b337fdfbfdd38ea8daa920679f673
[INFO] running `"docker" "start" "-a" "460e8598fc2b6028c07c830de0546e27338b337fdfbfdd38ea8daa920679f673"`
[INFO] [stderr]    Compiling sliding_windows v3.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]   --> src/sliding_windows.rs:94:9
[INFO] [stderr]    |
[INFO] [stderr] 94 |         unsafe {
[INFO] [stderr]    |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `"docker" "inspect" "460e8598fc2b6028c07c830de0546e27338b337fdfbfdd38ea8daa920679f673"`
[INFO] running `"docker" "rm" "-f" "460e8598fc2b6028c07c830de0546e27338b337fdfbfdd38ea8daa920679f673"`
[INFO] [stdout] 460e8598fc2b6028c07c830de0546e27338b337fdfbfdd38ea8daa920679f673
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/sliding_windows/3.0.0:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] e16f9da9e5f7246fc6deef60d4b787185f9ae062b7d25d857f0c979b2743cbdc
[INFO] running `"docker" "start" "-a" "e16f9da9e5f7246fc6deef60d4b787185f9ae062b7d25d857f0c979b2743cbdc"`
[INFO] [stderr]    Compiling sliding_windows v3.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tests.rs:35:13
[INFO] [stderr]    |
[INFO] [stderr] 35 |         let mut element_1 = iter_mut.next().unwrap();
[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] warning: unnecessary `unsafe` block
[INFO] [stderr]   --> src/sliding_windows.rs:94:9
[INFO] [stderr]    |
[INFO] [stderr] 94 |         unsafe {
[INFO] [stderr]    |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `"docker" "inspect" "e16f9da9e5f7246fc6deef60d4b787185f9ae062b7d25d857f0c979b2743cbdc"`
[INFO] running `"docker" "rm" "-f" "e16f9da9e5f7246fc6deef60d4b787185f9ae062b7d25d857f0c979b2743cbdc"`
[INFO] [stdout] e16f9da9e5f7246fc6deef60d4b787185f9ae062b7d25d857f0c979b2743cbdc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/sliding_windows/3.0.0:/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 1d0d2060146de89d94ca9c78510dde1fd3a821dfd2e7bcaa9d2c7ae48f3db917
[INFO] running `"docker" "start" "-a" "1d0d2060146de89d94ca9c78510dde1fd3a821dfd2e7bcaa9d2c7ae48f3db917"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sliding_windows-cf0833e750818184
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test tests::sliding_windows_2 ... ok
[INFO] [stdout] test tests::sliding_windows_1 ... ok
[INFO] [stdout] test tests::sliding_windows_4 ... ok
[INFO] [stdout] test tests::sliding_windows_5 ... ok
[INFO] [stdout] test tests::sliding_windows_6 ... ok
[INFO] [stdout] test tests::sliding_windows_3 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests sliding_windows
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs -  (line 62) ... ok
[INFO] [stdout] test src/sliding_windows.rs - sliding_windows::Window (line 106) ... ok
[INFO] [stdout] test src/lib.rs -  (line 20) ... ok
[INFO] [stdout] test src/lib.rs -  (line 37) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "1d0d2060146de89d94ca9c78510dde1fd3a821dfd2e7bcaa9d2c7ae48f3db917"`
[INFO] running `"docker" "rm" "-f" "1d0d2060146de89d94ca9c78510dde1fd3a821dfd2e7bcaa9d2c7ae48f3db917"`
[INFO] [stdout] 1d0d2060146de89d94ca9c78510dde1fd3a821dfd2e7bcaa9d2c7ae48f3db917