[INFO] updating cached repository ymmtmdk/shadow_cost_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ymmtmdk/shadow_cost_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ymmtmdk/shadow_cost_rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/ymmtmdk/shadow_cost_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ymmtmdk/shadow_cost_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ymmtmdk/shadow_cost_rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ymmtmdk/shadow_cost_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ymmtmdk/shadow_cost_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3503bcbde45271f3dd4010fb9d0d611e55c51a0a
[INFO] sha for GitHub repo ymmtmdk/shadow_cost_rust: 3503bcbde45271f3dd4010fb9d0d611e55c51a0a
[INFO] validating manifest of ymmtmdk/shadow_cost_rust 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 ymmtmdk/shadow_cost_rust 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 ymmtmdk/shadow_cost_rust
[INFO] finished frobbing ymmtmdk/shadow_cost_rust
[INFO] frobbed toml for ymmtmdk/shadow_cost_rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/ymmtmdk/shadow_cost_rust/Cargo.toml
[INFO] started frobbing ymmtmdk/shadow_cost_rust
[INFO] finished frobbing ymmtmdk/shadow_cost_rust
[INFO] frobbed toml for ymmtmdk/shadow_cost_rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ymmtmdk/shadow_cost_rust/Cargo.toml
[INFO] crate ymmtmdk/shadow_cost_rust 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 ymmtmdk/shadow_cost_rust 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ymmtmdk/shadow_cost_rust:/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] b5b66e323b8685f6f7eb4fcdae1643d14bf43a63025054db711dbaf0a0104046
[INFO] running `"docker" "start" "-a" "b5b66e323b8685f6f7eb4fcdae1643d14bf43a63025054db711dbaf0a0104046"`
[INFO] [stderr]    Compiling shadow_cost_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:294:17
[INFO] [stderr]     |
[INFO] [stderr] 294 |             let mut t = self.cache.get_mut(key).unwrap();
[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 2.52s
[INFO] running `"docker" "inspect" "b5b66e323b8685f6f7eb4fcdae1643d14bf43a63025054db711dbaf0a0104046"`
[INFO] running `"docker" "rm" "-f" "b5b66e323b8685f6f7eb4fcdae1643d14bf43a63025054db711dbaf0a0104046"`
[INFO] [stdout] b5b66e323b8685f6f7eb4fcdae1643d14bf43a63025054db711dbaf0a0104046
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ymmtmdk/shadow_cost_rust:/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] 1c0797e84706bfb6efb8d05f06009ec3615fa4b66f48fe7a30fdccd5e1304628
[INFO] running `"docker" "start" "-a" "1c0797e84706bfb6efb8d05f06009ec3615fa4b66f48fe7a30fdccd5e1304628"`
[INFO] [stderr]    Compiling shadow_cost_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:294:17
[INFO] [stderr]     |
[INFO] [stderr] 294 |             let mut t = self.cache.get_mut(key).unwrap();
[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 1.76s
[INFO] running `"docker" "inspect" "1c0797e84706bfb6efb8d05f06009ec3615fa4b66f48fe7a30fdccd5e1304628"`
[INFO] running `"docker" "rm" "-f" "1c0797e84706bfb6efb8d05f06009ec3615fa4b66f48fe7a30fdccd5e1304628"`
[INFO] [stdout] 1c0797e84706bfb6efb8d05f06009ec3615fa4b66f48fe7a30fdccd5e1304628
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ymmtmdk/shadow_cost_rust:/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] 366e15d0b0be7c4615c7b98c7251eb41eff698e538725dbed998eeab95fddebe
[INFO] running `"docker" "start" "-a" "366e15d0b0be7c4615c7b98c7251eb41eff698e538725dbed998eeab95fddebe"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/shadow_cost_rust-de743d629ba56ae7
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stdout] test tests::remove ... ok
[INFO] [stdout] test tests::player ... ok
[INFO] [stdout] test tests::play ... ok
[INFO] [stdout] test tests::new ... ok
[INFO] [stdout] test tests::less_than ... ok
[INFO] [stdout] test tests::trial ... ok
[INFO] [stdout] test tests::size ... ok
[INFO] [stdout] test tests::draw ... ok
[INFO] [stdout] test tests::add ... ok
[INFO] [stdout] test tests::cost_sim ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/shadow_cost_rust-12e1fcbde9707fc0
[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 shadow_cost_rust
[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" "366e15d0b0be7c4615c7b98c7251eb41eff698e538725dbed998eeab95fddebe"`
[INFO] running `"docker" "rm" "-f" "366e15d0b0be7c4615c7b98c7251eb41eff698e538725dbed998eeab95fddebe"`
[INFO] [stdout] 366e15d0b0be7c4615c7b98c7251eb41eff698e538725dbed998eeab95fddebe