[INFO] crate graph-similarity-cmd 0.0.1 is already in cache
[INFO] extracting crate graph-similarity-cmd 0.0.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/graph-similarity-cmd/0.0.1
[INFO] extracting crate graph-similarity-cmd 0.0.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/graph-similarity-cmd/0.0.1
[INFO] validating manifest of graph-similarity-cmd-0.0.1 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 graph-similarity-cmd-0.0.1 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 graph-similarity-cmd-0.0.1
[INFO] finished frobbing graph-similarity-cmd-0.0.1
[INFO] frobbed toml for graph-similarity-cmd-0.0.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/graph-similarity-cmd/0.0.1/Cargo.toml
[INFO] started frobbing graph-similarity-cmd-0.0.1
[INFO] finished frobbing graph-similarity-cmd-0.0.1
[INFO] frobbed toml for graph-similarity-cmd-0.0.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/graph-similarity-cmd/0.0.1/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 graph-similarity-cmd-0.0.1 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-1/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/graph-similarity-cmd/0.0.1:/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] 460bda140f89f311ed2f6fae4ccc1edd0cadd99493b992571cd0ac20ff311782
[INFO] running `"docker" "start" "-a" "460bda140f89f311ed2f6fae4ccc1edd0cadd99493b992571cd0ac20ff311782"`
[INFO] [stderr]    Compiling asexp v0.3.2
[INFO] [stderr]    Compiling munkres v0.3.0
[INFO] [stderr]    Compiling petgraph v0.2.10
[INFO] [stderr]    Compiling nalgebra v0.5.1
[INFO] [stderr] error[E0658]: use of unstable library feature 'test': `bench` is a part of custom test frameworks which are unstable
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/munkres-0.3.0/src/lib.rs:734:3
[INFO] [stderr]     |
[INFO] [stderr] 734 | #[bench]
[INFO] [stderr]     |   ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/50297
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: Could not compile `munkres`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "460bda140f89f311ed2f6fae4ccc1edd0cadd99493b992571cd0ac20ff311782"`
[INFO] running `"docker" "rm" "-f" "460bda140f89f311ed2f6fae4ccc1edd0cadd99493b992571cd0ac20ff311782"`
[INFO] [stdout] 460bda140f89f311ed2f6fae4ccc1edd0cadd99493b992571cd0ac20ff311782