[INFO] updating cached repository eminence/snapshot_trim
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/eminence/snapshot_trim
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/eminence/snapshot_trim" "work/ex/beta-1.38-1/sources/1.37.0/gh/eminence/snapshot_trim"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/eminence/snapshot_trim'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/eminence/snapshot_trim" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/eminence/snapshot_trim"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/eminence/snapshot_trim'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b1bb505cdca364d322f9268fbc7a284734044a4b
[INFO] sha for GitHub repo eminence/snapshot_trim: b1bb505cdca364d322f9268fbc7a284734044a4b
[INFO] validating manifest of eminence/snapshot_trim 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 eminence/snapshot_trim 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 eminence/snapshot_trim
[INFO] finished frobbing eminence/snapshot_trim
[INFO] frobbed toml for eminence/snapshot_trim written to work/ex/beta-1.38-1/sources/1.37.0/gh/eminence/snapshot_trim/Cargo.toml
[INFO] started frobbing eminence/snapshot_trim
[INFO] finished frobbing eminence/snapshot_trim
[INFO] frobbed toml for eminence/snapshot_trim written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/eminence/snapshot_trim/Cargo.toml
[INFO] crate eminence/snapshot_trim 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 eminence/snapshot_trim 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/gh/eminence/snapshot_trim:/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] 2b6e82bdfdeb8569cf2a2b6e52dfda48594b43addf491be40df4a449d21db5fa
[INFO] running `"docker" "start" "-a" "2b6e82bdfdeb8569cf2a2b6e52dfda48594b43addf491be40df4a449d21db5fa"`
[INFO] [stderr]    Compiling serde v1.0.24
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling time v0.1.38
[INFO] [stderr]    Compiling serde_derive_internals v0.18.0
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling regex v0.2.3
[INFO] [stderr]    Compiling serde_derive v1.0.24
[INFO] [stderr]    Compiling docopt v0.8.1
[INFO] [stderr]    Compiling toml v0.4.5
[INFO] [stderr]    Compiling snapshot_trim v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |         write!(fmt, "<Snapshot {:?} {:?}>", self.snap, self.state);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 35.26s
[INFO] running `"docker" "inspect" "2b6e82bdfdeb8569cf2a2b6e52dfda48594b43addf491be40df4a449d21db5fa"`
[INFO] running `"docker" "rm" "-f" "2b6e82bdfdeb8569cf2a2b6e52dfda48594b43addf491be40df4a449d21db5fa"`
[INFO] [stdout] 2b6e82bdfdeb8569cf2a2b6e52dfda48594b43addf491be40df4a449d21db5fa
[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/gh/eminence/snapshot_trim:/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] 42c56b0131b311955fc3c7ebc26aa1d2f83af6a9523926df77e4da0cc61be136
[INFO] running `"docker" "start" "-a" "42c56b0131b311955fc3c7ebc26aa1d2f83af6a9523926df77e4da0cc61be136"`
[INFO] [stderr]    Compiling snapshot_trim v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |         write!(fmt, "<Snapshot {:?} {:?}>", self.snap, self.state);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `"docker" "inspect" "42c56b0131b311955fc3c7ebc26aa1d2f83af6a9523926df77e4da0cc61be136"`
[INFO] running `"docker" "rm" "-f" "42c56b0131b311955fc3c7ebc26aa1d2f83af6a9523926df77e4da0cc61be136"`
[INFO] [stdout] 42c56b0131b311955fc3c7ebc26aa1d2f83af6a9523926df77e4da0cc61be136
[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/gh/eminence/snapshot_trim:/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] 586b3a8ef39d24446a350c29651c7665d56e5e3c0e38373971957fd3bbb5940f
[INFO] running `"docker" "start" "-a" "586b3a8ef39d24446a350c29651c7665d56e5e3c0e38373971957fd3bbb5940f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/snapshot_trim-91f56d9a197563ec
[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" "586b3a8ef39d24446a350c29651c7665d56e5e3c0e38373971957fd3bbb5940f"`
[INFO] running `"docker" "rm" "-f" "586b3a8ef39d24446a350c29651c7665d56e5e3c0e38373971957fd3bbb5940f"`
[INFO] [stdout] 586b3a8ef39d24446a350c29651c7665d56e5e3c0e38373971957fd3bbb5940f