[INFO] crate python-launcher 0.7.2 is already in cache
[INFO] extracting crate python-launcher 0.7.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/python-launcher/0.7.2
[INFO] extracting crate python-launcher 0.7.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/python-launcher/0.7.2
[INFO] validating manifest of python-launcher-0.7.2 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 python-launcher-0.7.2 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 python-launcher-0.7.2
[INFO] finished frobbing python-launcher-0.7.2
[INFO] frobbed toml for python-launcher-0.7.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/python-launcher/0.7.2/Cargo.toml
[INFO] started frobbing python-launcher-0.7.2
[INFO] finished frobbing python-launcher-0.7.2
[INFO] frobbed toml for python-launcher-0.7.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/python-launcher/0.7.2/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 python-launcher-0.7.2 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/python-launcher/0.7.2:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 8b94c56ae64b0c86ffea38c173778755b5d9840d10cd146ccf003ad0b48f3e0e
[INFO] running `"docker" "start" "-a" "8b94c56ae64b0c86ffea38c173778755b5d9840d10cd146ccf003ad0b48f3e0e"`
[INFO] [stderr]    Compiling python-launcher v0.7.2 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:44:9
[INFO] [stderr]    |
[INFO] [stderr] 44 |     let mut chosen_path: Option<path::PathBuf>;
[INFO] [stderr]    |         ----^^^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.11s
[INFO] running `"docker" "inspect" "8b94c56ae64b0c86ffea38c173778755b5d9840d10cd146ccf003ad0b48f3e0e"`
[INFO] running `"docker" "rm" "-f" "8b94c56ae64b0c86ffea38c173778755b5d9840d10cd146ccf003ad0b48f3e0e"`
[INFO] [stdout] 8b94c56ae64b0c86ffea38c173778755b5d9840d10cd146ccf003ad0b48f3e0e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/python-launcher/0.7.2:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 360c2d56356227d9d6ac9a3927cfef502bee49056aae4cb53fb1b1d404814c82
[INFO] running `"docker" "start" "-a" "360c2d56356227d9d6ac9a3927cfef502bee49056aae4cb53fb1b1d404814c82"`
[INFO] [stderr]    Compiling python-launcher v0.7.2 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:44:9
[INFO] [stderr]    |
[INFO] [stderr] 44 |     let mut chosen_path: Option<path::PathBuf>;
[INFO] [stderr]    |         ----^^^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.79s
[INFO] running `"docker" "inspect" "360c2d56356227d9d6ac9a3927cfef502bee49056aae4cb53fb1b1d404814c82"`
[INFO] running `"docker" "rm" "-f" "360c2d56356227d9d6ac9a3927cfef502bee49056aae4cb53fb1b1d404814c82"`
[INFO] [stdout] 360c2d56356227d9d6ac9a3927cfef502bee49056aae4cb53fb1b1d404814c82
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/python-launcher/0.7.2:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 2dedfcbe6f016fdf86292f01a5455a58bd7af45936bbd0a3f76f51c0c3bb659b
[INFO] running `"docker" "start" "-a" "2dedfcbe6f016fdf86292f01a5455a58bd7af45936bbd0a3f76f51c0c3bb659b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/python_launcher-4d9307d6a2a4e7fb
[INFO] [stdout] 
[INFO] [stdout] running 12 tests
[INFO] [stdout] test tests::test_find_shebang ... ok
[INFO] [stdout] test tests::test_requested_version_env_var ... ok
[INFO] [stdout] test tests::test_split_shebang ... ok
[INFO] [stdout] test tests::test_choose_executable ... ok
[INFO] [stdout] test tests::test_filter_python_executables ... ok
[INFO] [stdout] test tests::test_virtual_env ... ok
[INFO] [stdout] test tests::test_version_matches ... ok
[INFO] [stdout] test tests::test_version_from_flag ... ok
[INFO] [stdout] test tests::unit_test_path_entries ... ok
[INFO] [stdout] test tests::system_test_path_entries ... ok
[INFO] [stdout] test tests::test_RequestedVersion_from_string ... ok
[INFO] [stdout] test tests::test_action_from_args ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/py-70b55f10bc9c6de1
[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 python-launcher
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - action_from_args (line 148) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "2dedfcbe6f016fdf86292f01a5455a58bd7af45936bbd0a3f76f51c0c3bb659b"`
[INFO] running `"docker" "rm" "-f" "2dedfcbe6f016fdf86292f01a5455a58bd7af45936bbd0a3f76f51c0c3bb659b"`
[INFO] [stdout] 2dedfcbe6f016fdf86292f01a5455a58bd7af45936bbd0a3f76f51c0c3bb659b