[INFO] updating cached repository ustulation/ffi-trait-poc
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ustulation/ffi-trait-poc
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ustulation/ffi-trait-poc" "work/ex/beta-1.38-1/sources/1.37.0/gh/ustulation/ffi-trait-poc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ustulation/ffi-trait-poc'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ustulation/ffi-trait-poc" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ustulation/ffi-trait-poc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ustulation/ffi-trait-poc'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7d131d9f948fbc7162c6938698dff20043949199
[INFO] sha for GitHub repo ustulation/ffi-trait-poc: 7d131d9f948fbc7162c6938698dff20043949199
[INFO] validating manifest of ustulation/ffi-trait-poc 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 ustulation/ffi-trait-poc 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 ustulation/ffi-trait-poc
[INFO] finished frobbing ustulation/ffi-trait-poc
[INFO] frobbed toml for ustulation/ffi-trait-poc written to work/ex/beta-1.38-1/sources/1.37.0/gh/ustulation/ffi-trait-poc/Cargo.toml
[INFO] started frobbing ustulation/ffi-trait-poc
[INFO] finished frobbing ustulation/ffi-trait-poc
[INFO] frobbed toml for ustulation/ffi-trait-poc written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ustulation/ffi-trait-poc/Cargo.toml
[INFO] crate ustulation/ffi-trait-poc already has a lockfile, it will not be regenerated
[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 ustulation/ffi-trait-poc 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-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ustulation/ffi-trait-poc:/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] 074792a71f3543d9c5d5a8540171951321899f3946fc79322b6d058fd61b086e
[INFO] running `"docker" "start" "-a" "074792a71f3543d9c5d5a8540171951321899f3946fc79322b6d058fd61b086e"`
[INFO] [stderr]    Compiling ffi-trait-poc v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/main.rs:56:12
[INFO] [stderr]    |
[INFO] [stderr] 56 |         Ok((CString::new(self)?.into_raw()))
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.20s
[INFO] running `"docker" "inspect" "074792a71f3543d9c5d5a8540171951321899f3946fc79322b6d058fd61b086e"`
[INFO] running `"docker" "rm" "-f" "074792a71f3543d9c5d5a8540171951321899f3946fc79322b6d058fd61b086e"`
[INFO] [stdout] 074792a71f3543d9c5d5a8540171951321899f3946fc79322b6d058fd61b086e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ustulation/ffi-trait-poc:/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] 66ebfc72906025b83b5e8fa8c232325554b6fae383e222ef8404d2639b698415
[INFO] running `"docker" "start" "-a" "66ebfc72906025b83b5e8fa8c232325554b6fae383e222ef8404d2639b698415"`
[INFO] [stderr]    Compiling ffi-trait-poc v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/main.rs:56:12
[INFO] [stderr]    |
[INFO] [stderr] 56 |         Ok((CString::new(self)?.into_raw()))
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `"docker" "inspect" "66ebfc72906025b83b5e8fa8c232325554b6fae383e222ef8404d2639b698415"`
[INFO] running `"docker" "rm" "-f" "66ebfc72906025b83b5e8fa8c232325554b6fae383e222ef8404d2639b698415"`
[INFO] [stdout] 66ebfc72906025b83b5e8fa8c232325554b6fae383e222ef8404d2639b698415
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ustulation/ffi-trait-poc:/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] f2fc918fff892c11f49e8889478bd8b2f7d44c21862157271800a459b2cd8eeb
[INFO] running `"docker" "start" "-a" "f2fc918fff892c11f49e8889478bd8b2f7d44c21862157271800a459b2cd8eeb"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/ffi_trait_poc-0b87c996ffbb0c85
[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] running `"docker" "inspect" "f2fc918fff892c11f49e8889478bd8b2f7d44c21862157271800a459b2cd8eeb"`
[INFO] running `"docker" "rm" "-f" "f2fc918fff892c11f49e8889478bd8b2f7d44c21862157271800a459b2cd8eeb"`
[INFO] [stdout] f2fc918fff892c11f49e8889478bd8b2f7d44c21862157271800a459b2cd8eeb