[INFO] updating cached repository Jessime/christmas_card
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Jessime/christmas_card
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Jessime/christmas_card" "work/ex/beta-1.38-1/sources/1.37.0/gh/Jessime/christmas_card"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Jessime/christmas_card'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Jessime/christmas_card" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jessime/christmas_card"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jessime/christmas_card'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cf5c3823e6a882736898cb48c4518a207222438d
[INFO] sha for GitHub repo Jessime/christmas_card: cf5c3823e6a882736898cb48c4518a207222438d
[INFO] validating manifest of Jessime/christmas_card 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 Jessime/christmas_card 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 Jessime/christmas_card
[INFO] finished frobbing Jessime/christmas_card
[INFO] frobbed toml for Jessime/christmas_card written to work/ex/beta-1.38-1/sources/1.37.0/gh/Jessime/christmas_card/Cargo.toml
[INFO] started frobbing Jessime/christmas_card
[INFO] finished frobbing Jessime/christmas_card
[INFO] frobbed toml for Jessime/christmas_card written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jessime/christmas_card/Cargo.toml
[INFO] crate Jessime/christmas_card 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing Jessime/christmas_card 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-4/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/Jessime/christmas_card:/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] c90735b0dbebb39e4951628d3356e0542c9657cb5de21d51849ad58303c5ca5b
[INFO] running `"docker" "start" "-a" "c90735b0dbebb39e4951628d3356e0542c9657cb5de21d51849ad58303c5ca5b"`
[INFO] [stderr]    Compiling patty_card v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:30:13
[INFO] [stderr]    |
[INFO] [stderr] 30 |             io::stdout().flush();
[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] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.07s
[INFO] running `"docker" "inspect" "c90735b0dbebb39e4951628d3356e0542c9657cb5de21d51849ad58303c5ca5b"`
[INFO] running `"docker" "rm" "-f" "c90735b0dbebb39e4951628d3356e0542c9657cb5de21d51849ad58303c5ca5b"`
[INFO] [stdout] c90735b0dbebb39e4951628d3356e0542c9657cb5de21d51849ad58303c5ca5b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/Jessime/christmas_card:/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] 8c013cdd65e638790f295e1b2789473434525f931bac1dc0bada42f54558abbe
[INFO] running `"docker" "start" "-a" "8c013cdd65e638790f295e1b2789473434525f931bac1dc0bada42f54558abbe"`
[INFO] [stderr]    Compiling patty_card v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:30:13
[INFO] [stderr]    |
[INFO] [stderr] 30 |             io::stdout().flush();
[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] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `"docker" "inspect" "8c013cdd65e638790f295e1b2789473434525f931bac1dc0bada42f54558abbe"`
[INFO] running `"docker" "rm" "-f" "8c013cdd65e638790f295e1b2789473434525f931bac1dc0bada42f54558abbe"`
[INFO] [stdout] 8c013cdd65e638790f295e1b2789473434525f931bac1dc0bada42f54558abbe
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/Jessime/christmas_card:/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] ec9b1c7e91085f9d30d587eabb92d16ce8124f4ae6ac8ae38108e6fd17ed3e4a
[INFO] running `"docker" "start" "-a" "ec9b1c7e91085f9d30d587eabb92d16ce8124f4ae6ac8ae38108e6fd17ed3e4a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/patty_card-de3500af3d75af66
[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" "ec9b1c7e91085f9d30d587eabb92d16ce8124f4ae6ac8ae38108e6fd17ed3e4a"`
[INFO] running `"docker" "rm" "-f" "ec9b1c7e91085f9d30d587eabb92d16ce8124f4ae6ac8ae38108e6fd17ed3e4a"`
[INFO] [stdout] ec9b1c7e91085f9d30d587eabb92d16ce8124f4ae6ac8ae38108e6fd17ed3e4a