[INFO] crate mutate_once 0.1.0 is already in cache
[INFO] extracting crate mutate_once 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/mutate_once/0.1.0
[INFO] extracting crate mutate_once 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mutate_once/0.1.0
[INFO] validating manifest of mutate_once-0.1.0 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 mutate_once-0.1.0 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 mutate_once-0.1.0
[INFO] finished frobbing mutate_once-0.1.0
[INFO] frobbed toml for mutate_once-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/mutate_once/0.1.0/Cargo.toml
[INFO] started frobbing mutate_once-0.1.0
[INFO] finished frobbing mutate_once-0.1.0
[INFO] frobbed toml for mutate_once-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mutate_once/0.1.0/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] 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 mutate_once-0.1.0 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-6/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/mutate_once/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] dcb6d3a6db7de578fb259149211c5bc30ab12eddc525114924ac7faaad646b38
[INFO] running `"docker" "start" "-a" "dcb6d3a6db7de578fb259149211c5bc30ab12eddc525114924ac7faaad646b38"`
[INFO] [stderr]    Compiling mutate_once v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `"docker" "inspect" "dcb6d3a6db7de578fb259149211c5bc30ab12eddc525114924ac7faaad646b38"`
[INFO] running `"docker" "rm" "-f" "dcb6d3a6db7de578fb259149211c5bc30ab12eddc525114924ac7faaad646b38"`
[INFO] [stdout] dcb6d3a6db7de578fb259149211c5bc30ab12eddc525114924ac7faaad646b38
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/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/mutate_once/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] ab6473e3f4ff7eaddbb198c51258c862d1b0b69cc4757b7839934f4c3f7c82b4
[INFO] running `"docker" "start" "-a" "ab6473e3f4ff7eaddbb198c51258c862d1b0b69cc4757b7839934f4c3f7c82b4"`
[INFO] [stderr]    Compiling mutate_once v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.72s
[INFO] running `"docker" "inspect" "ab6473e3f4ff7eaddbb198c51258c862d1b0b69cc4757b7839934f4c3f7c82b4"`
[INFO] running `"docker" "rm" "-f" "ab6473e3f4ff7eaddbb198c51258c862d1b0b69cc4757b7839934f4c3f7c82b4"`
[INFO] [stdout] ab6473e3f4ff7eaddbb198c51258c862d1b0b69cc4757b7839934f4c3f7c82b4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/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/mutate_once/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 4f4ed8e96f34cc180a165781810c1efa12ab69fa7a10164a4bf64ff716dcf6a3
[INFO] running `"docker" "start" "-a" "4f4ed8e96f34cc180a165781810c1efa12ab69fa7a10164a4bf64ff716dcf6a3"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mutate_once-c573b11a5e33ee48
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test tests::multiple_refs ... ok
[INFO] [stdout] test tests::temporary_value ... ok
[INFO] [stdout] test tests::repeated_muts ... ok
[INFO] [stdout] test tests::ref_while_mut ... ok
[INFO] [stdout] test tests::mut_after_ref ... ok
[INFO] [stdout] test tests::multiple_muts ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/getter-8f5a3138d3be8551
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test single ... ok
[INFO] [stdout] test collection ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mutate_once
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test src/lib.rs - MutOnce<T>::get_ref (line 160) ... ok
[INFO] [stdout] test src/lib.rs - MutOnce<T>::get_ref (line 152) ... ok
[INFO] [stdout] test src/lib.rs - MutOnce<T>::get_mut (line 125) ... ok
[INFO] [stdout] test src/lib.rs - MutOnce<T>::get_mut (line 117) ... ok
[INFO] [stdout] test src/lib.rs - MutOnce<T>::get_mut (line 108) ... ok
[INFO] [stdout] test src/lib.rs - MutOnce (line 59) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "4f4ed8e96f34cc180a165781810c1efa12ab69fa7a10164a4bf64ff716dcf6a3"`
[INFO] running `"docker" "rm" "-f" "4f4ed8e96f34cc180a165781810c1efa12ab69fa7a10164a4bf64ff716dcf6a3"`
[INFO] [stdout] 4f4ed8e96f34cc180a165781810c1efa12ab69fa7a10164a4bf64ff716dcf6a3