[INFO] updating cached repository northerner/taxicab
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/northerner/taxicab
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/northerner/taxicab" "work/ex/beta-1.38-1/sources/1.37.0/gh/northerner/taxicab"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/northerner/taxicab'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/northerner/taxicab" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/northerner/taxicab"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/northerner/taxicab'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dd1b0673b1c7ff4a80eb4dd52bf6a02a2f15bfc8
[INFO] sha for GitHub repo northerner/taxicab: dd1b0673b1c7ff4a80eb4dd52bf6a02a2f15bfc8
[INFO] validating manifest of northerner/taxicab 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 northerner/taxicab 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 northerner/taxicab
[INFO] finished frobbing northerner/taxicab
[INFO] frobbed toml for northerner/taxicab written to work/ex/beta-1.38-1/sources/1.37.0/gh/northerner/taxicab/Cargo.toml
[INFO] started frobbing northerner/taxicab
[INFO] finished frobbing northerner/taxicab
[INFO] frobbed toml for northerner/taxicab written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/northerner/taxicab/Cargo.toml
[INFO] crate northerner/taxicab 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 northerner/taxicab 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/northerner/taxicab:/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] 904a321fbefb51cb012a947f250d05829419feee68cba2d9be24a5c8579d906f
[INFO] running `"docker" "start" "-a" "904a321fbefb51cb012a947f250d05829419feee68cba2d9be24a5c8579d906f"`
[INFO] [stderr]    Compiling taxicab v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     file.read_to_string(&mut buffer);
[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 0.81s
[INFO] running `"docker" "inspect" "904a321fbefb51cb012a947f250d05829419feee68cba2d9be24a5c8579d906f"`
[INFO] running `"docker" "rm" "-f" "904a321fbefb51cb012a947f250d05829419feee68cba2d9be24a5c8579d906f"`
[INFO] [stdout] 904a321fbefb51cb012a947f250d05829419feee68cba2d9be24a5c8579d906f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/northerner/taxicab:/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] d5fc3fe4a4a34f911b946e0bd7899863083365a5ca959036d668a902402c2d1b
[INFO] running `"docker" "start" "-a" "d5fc3fe4a4a34f911b946e0bd7899863083365a5ca959036d668a902402c2d1b"`
[INFO] [stderr]    Compiling taxicab v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     file.read_to_string(&mut buffer);
[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 0.85s
[INFO] running `"docker" "inspect" "d5fc3fe4a4a34f911b946e0bd7899863083365a5ca959036d668a902402c2d1b"`
[INFO] running `"docker" "rm" "-f" "d5fc3fe4a4a34f911b946e0bd7899863083365a5ca959036d668a902402c2d1b"`
[INFO] [stdout] d5fc3fe4a4a34f911b946e0bd7899863083365a5ca959036d668a902402c2d1b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/northerner/taxicab:/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] 7076c48e4ab5088f1b76a25ba967ce5100dbc468a1eaab7f7910ef8155be23eb
[INFO] running `"docker" "start" "-a" "7076c48e4ab5088f1b76a25ba967ce5100dbc468a1eaab7f7910ef8155be23eb"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/taxicab-3871b2ece2d1dea4
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test returns_count_of_valid_triangles ... ok
[INFO] [stdout] test returns_true_if_valid_triangle ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "7076c48e4ab5088f1b76a25ba967ce5100dbc468a1eaab7f7910ef8155be23eb"`
[INFO] running `"docker" "rm" "-f" "7076c48e4ab5088f1b76a25ba967ce5100dbc468a1eaab7f7910ef8155be23eb"`
[INFO] [stdout] 7076c48e4ab5088f1b76a25ba967ce5100dbc468a1eaab7f7910ef8155be23eb