[INFO] crate mucell 0.3.5 is already in cache
[INFO] extracting crate mucell 0.3.5 into work/ex/beta-1.38-1/sources/1.37.0/reg/mucell/0.3.5
[INFO] extracting crate mucell 0.3.5 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mucell/0.3.5
[INFO] validating manifest of mucell-0.3.5 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 mucell-0.3.5 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 mucell-0.3.5
[INFO] finished frobbing mucell-0.3.5
[INFO] frobbed toml for mucell-0.3.5 written to work/ex/beta-1.38-1/sources/1.37.0/reg/mucell/0.3.5/Cargo.toml
[INFO] started frobbing mucell-0.3.5
[INFO] finished frobbing mucell-0.3.5
[INFO] frobbed toml for mucell-0.3.5 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mucell/0.3.5/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 mucell-0.3.5 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-3/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/mucell/0.3.5:/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] 083e844a062e5f035232216be09d5f567be87f49d4b7691d0338dc912f45e74b
[INFO] running `"docker" "start" "-a" "083e844a062e5f035232216be09d5f567be87f49d4b7691d0338dc912f45e74b"`
[INFO] [stderr]    Compiling mucell v0.3.5 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/lib.rs:149:9
[INFO] [stderr]     |
[INFO] [stderr] 149 |         unsafe { self.value.into_inner() }
[INFO] [stderr]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]     |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]    --> src/lib.rs:68:20
[INFO] [stderr]     |
[INFO] [stderr] 68  | #![warn(bad_style, unused, missing_docs)]
[INFO] [stderr]     |                    ^^^^^^
[INFO] [stderr]     = note: `#[warn(unused_unsafe)]` implied by `#[warn(unused)]`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `"docker" "inspect" "083e844a062e5f035232216be09d5f567be87f49d4b7691d0338dc912f45e74b"`
[INFO] running `"docker" "rm" "-f" "083e844a062e5f035232216be09d5f567be87f49d4b7691d0338dc912f45e74b"`
[INFO] [stdout] 083e844a062e5f035232216be09d5f567be87f49d4b7691d0338dc912f45e74b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/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/mucell/0.3.5:/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] d829f3e39d89a53d4cae61f9798504e12226e01eec99824dd93198646e6a62c7
[INFO] running `"docker" "start" "-a" "d829f3e39d89a53d4cae61f9798504e12226e01eec99824dd93198646e6a62c7"`
[INFO] [stderr]    Compiling mucell v0.3.5 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> examples/vector_munger.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use] extern crate mucell;
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/lib.rs:149:9
[INFO] [stderr]     |
[INFO] [stderr] 149 |         unsafe { self.value.into_inner() }
[INFO] [stderr]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]     |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]    --> src/lib.rs:68:20
[INFO] [stderr]     |
[INFO] [stderr] 68  | #![warn(bad_style, unused, missing_docs)]
[INFO] [stderr]     |                    ^^^^^^
[INFO] [stderr]     = note: `#[warn(unused_unsafe)]` implied by `#[warn(unused)]`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `"docker" "inspect" "d829f3e39d89a53d4cae61f9798504e12226e01eec99824dd93198646e6a62c7"`
[INFO] running `"docker" "rm" "-f" "d829f3e39d89a53d4cae61f9798504e12226e01eec99824dd93198646e6a62c7"`
[INFO] [stdout] d829f3e39d89a53d4cae61f9798504e12226e01eec99824dd93198646e6a62c7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/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/mucell/0.3.5:/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] 14e9255fefa6d9ab7f621c2d473c8dad22ab06eb11b582105dbf2b5fb53dfd18
[INFO] running `"docker" "start" "-a" "14e9255fefa6d9ab7f621c2d473c8dad22ab06eb11b582105dbf2b5fb53dfd18"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mucell-fecc3201c7a67f56
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test unsafe_subversion_demo ... ok
[INFO] [stdout] test test_try_mutate_in_try_mutate ... ok
[INFO] [stdout] test test_borrow_in_try_mutate ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mucell
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test src/lib.rs - MuCell<T>::new (line 111) ... ok
[INFO] [stdout] test src/lib.rs - MuCell<T>::into_inner (line 136) ... ok
[INFO] [stdout] test src/lib.rs - Ref::filter_map_unsafe (line 428) ... ok
[INFO] [stdout] test src/lib.rs - Ref::map_unsafe (line 375) ... ok
[INFO] [stdout] test src/lib.rs - Ref::into_inner (line 311) ... ok
[INFO] [stdout] test src/lib.rs - Ref::into_owned (line 338) ... ok
[INFO] [stdout] test src/lib.rs -  (line 27) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "14e9255fefa6d9ab7f621c2d473c8dad22ab06eb11b582105dbf2b5fb53dfd18"`
[INFO] running `"docker" "rm" "-f" "14e9255fefa6d9ab7f621c2d473c8dad22ab06eb11b582105dbf2b5fb53dfd18"`
[INFO] [stdout] 14e9255fefa6d9ab7f621c2d473c8dad22ab06eb11b582105dbf2b5fb53dfd18