[INFO] crate completable_future 0.1.0 is already in cache
[INFO] extracting crate completable_future 0.1.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/completable_future/0.1.0
[INFO] extracting crate completable_future 0.1.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/completable_future/0.1.0
[INFO] validating manifest of completable_future-0.1.0 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 completable_future-0.1.0 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 completable_future-0.1.0
[INFO] finished frobbing completable_future-0.1.0
[INFO] frobbed toml for completable_future-0.1.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/completable_future/0.1.0/Cargo.toml
[INFO] started frobbing completable_future-0.1.0
[INFO] finished frobbing completable_future-0.1.0
[INFO] frobbed toml for completable_future-0.1.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/completable_future/0.1.0/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 completable_future-0.1.0 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/completable_future/0.1.0:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] c2f8e26b57e168beae00ff26a6a7901293929be11a0512e92830c9df2315ddfc
[INFO] running `"docker" "start" "-a" "c2f8e26b57e168beae00ff26a6a7901293929be11a0512e92830c9df2315ddfc"`
[INFO] [stderr]    Compiling completable_future v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `"docker" "inspect" "c2f8e26b57e168beae00ff26a6a7901293929be11a0512e92830c9df2315ddfc"`
[INFO] running `"docker" "rm" "-f" "c2f8e26b57e168beae00ff26a6a7901293929be11a0512e92830c9df2315ddfc"`
[INFO] [stdout] c2f8e26b57e168beae00ff26a6a7901293929be11a0512e92830c9df2315ddfc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/completable_future/0.1.0:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] b4d0d01615e3a114ea5b46f8fa6e007d66382f64fe84fa39e509ab79fc70a6c5
[INFO] running `"docker" "start" "-a" "b4d0d01615e3a114ea5b46f8fa6e007d66382f64fe84fa39e509ab79fc70a6c5"`
[INFO] [stderr]    Compiling completable_future v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/tests.rs:75:7
[INFO] [stderr]    |
[INFO] [stderr] 75 |         let mut tm = mutate_counter.clone();
[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: variable does not need to be mutable
[INFO] [stderr]   --> tests/tests.rs:97:7
[INFO] [stderr]    |
[INFO] [stderr] 97 |         let mut tm = mutate_counter.clone();
[INFO] [stderr]    |             ----^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.27s
[INFO] running `"docker" "inspect" "b4d0d01615e3a114ea5b46f8fa6e007d66382f64fe84fa39e509ab79fc70a6c5"`
[INFO] running `"docker" "rm" "-f" "b4d0d01615e3a114ea5b46f8fa6e007d66382f64fe84fa39e509ab79fc70a6c5"`
[INFO] [stdout] b4d0d01615e3a114ea5b46f8fa6e007d66382f64fe84fa39e509ab79fc70a6c5
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/completable_future/0.1.0:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 0876c7dfc0de166b13f6392bf0a24289afd701cddbcc6c7a18e815b8d28989d4
[INFO] running `"docker" "start" "-a" "0876c7dfc0de166b13f6392bf0a24289afd701cddbcc6c7a18e815b8d28989d4"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.14s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/completable_future-3b9205905683ce09
[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] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/tests-e773cbb90fe7554b
[INFO] [stdout] running 6 tests
[INFO] [stdout] test test_errored_future ... ok
[INFO] [stdout] test test_completed_future ... ok
[INFO] [stdout] test test_complete_once ... ok
[INFO] [stdout] test test_error_once ... ok
[INFO] [stdout] test test_signal_error ... ok
[INFO] [stdout] test test_signal_complete ... 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 completable_future
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs -  (line 20) ... 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" "0876c7dfc0de166b13f6392bf0a24289afd701cddbcc6c7a18e815b8d28989d4"`
[INFO] running `"docker" "rm" "-f" "0876c7dfc0de166b13f6392bf0a24289afd701cddbcc6c7a18e815b8d28989d4"`
[INFO] [stdout] 0876c7dfc0de166b13f6392bf0a24289afd701cddbcc6c7a18e815b8d28989d4