[INFO] fetching crate maybe-single 0.4.0...
[INFO] extracting crate maybe-single 0.4.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/maybe-single/0.4.0
[INFO] extracting crate maybe-single 0.4.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/maybe-single/0.4.0
[INFO] validating manifest of maybe-single-0.4.0 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 maybe-single-0.4.0 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 maybe-single-0.4.0
[INFO] finished frobbing maybe-single-0.4.0
[INFO] frobbed toml for maybe-single-0.4.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/maybe-single/0.4.0/Cargo.toml
[INFO] started frobbing maybe-single-0.4.0
[INFO] finished frobbing maybe-single-0.4.0
[INFO] frobbed toml for maybe-single-0.4.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/maybe-single/0.4.0/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 maybe-single-0.4.0 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-5/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/maybe-single/0.4.0:/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] 6aaba190aa714415f3f3be5471d17b3e3b118f0a3927116e9f40a2a813e7d1b2
[INFO] running `"docker" "start" "-a" "6aaba190aa714415f3f3be5471d17b3e3b118f0a3927116e9f40a2a813e7d1b2"`
[INFO] [stderr]    Compiling maybe-single v0.4.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `"docker" "inspect" "6aaba190aa714415f3f3be5471d17b3e3b118f0a3927116e9f40a2a813e7d1b2"`
[INFO] running `"docker" "rm" "-f" "6aaba190aa714415f3f3be5471d17b3e3b118f0a3927116e9f40a2a813e7d1b2"`
[INFO] [stdout] 6aaba190aa714415f3f3be5471d17b3e3b118f0a3927116e9f40a2a813e7d1b2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/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/maybe-single/0.4.0:/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] 4f3179dfa35c21ba98067138a501f91b58e92bba9054eac59834c538fad74653
[INFO] running `"docker" "start" "-a" "4f3179dfa35c21ba98067138a501f91b58e92bba9054eac59834c538fad74653"`
[INFO] [stderr]    Compiling maybe-single v0.4.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `"docker" "inspect" "4f3179dfa35c21ba98067138a501f91b58e92bba9054eac59834c538fad74653"`
[INFO] running `"docker" "rm" "-f" "4f3179dfa35c21ba98067138a501f91b58e92bba9054eac59834c538fad74653"`
[INFO] [stdout] 4f3179dfa35c21ba98067138a501f91b58e92bba9054eac59834c538fad74653
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/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/maybe-single/0.4.0:/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] 796d3ac9a3367c7fbfbb9439b49e387919d862838f7e2875b6f1cae245d9275b
[INFO] running `"docker" "start" "-a" "796d3ac9a3367c7fbfbb9439b49e387919d862838f7e2875b6f1cae245d9275b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/maybe_single-52e82201fc0d089d
[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] [stderr]    Doc-tests maybe-single
[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" "796d3ac9a3367c7fbfbb9439b49e387919d862838f7e2875b6f1cae245d9275b"`
[INFO] running `"docker" "rm" "-f" "796d3ac9a3367c7fbfbb9439b49e387919d862838f7e2875b6f1cae245d9275b"`
[INFO] [stdout] 796d3ac9a3367c7fbfbb9439b49e387919d862838f7e2875b6f1cae245d9275b