[INFO] updating cached repository matthewa150/rusty_euler
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/matthewa150/rusty_euler
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/matthewa150/rusty_euler" "work/ex/beta-1.38-1/sources/1.37.0/gh/matthewa150/rusty_euler"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/matthewa150/rusty_euler'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/matthewa150/rusty_euler" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/matthewa150/rusty_euler"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/matthewa150/rusty_euler'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b881b96e770cf7d5afd500e68e2561dbc1895306
[INFO] sha for GitHub repo matthewa150/rusty_euler: b881b96e770cf7d5afd500e68e2561dbc1895306
[INFO] validating manifest of matthewa150/rusty_euler 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 matthewa150/rusty_euler 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 matthewa150/rusty_euler
[INFO] finished frobbing matthewa150/rusty_euler
[INFO] frobbed toml for matthewa150/rusty_euler written to work/ex/beta-1.38-1/sources/1.37.0/gh/matthewa150/rusty_euler/Cargo.toml
[INFO] started frobbing matthewa150/rusty_euler
[INFO] finished frobbing matthewa150/rusty_euler
[INFO] frobbed toml for matthewa150/rusty_euler written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/matthewa150/rusty_euler/Cargo.toml
[INFO] crate matthewa150/rusty_euler 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 matthewa150/rusty_euler 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/matthewa150/rusty_euler:/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] 2a75fa27ef0af6544f29a3ff0c93d090c5b6d639f5ab1e8d1c2e091591c8084a
[INFO] running `"docker" "start" "-a" "2a75fa27ef0af6544f29a3ff0c93d090c5b6d639f5ab1e8d1c2e091591c8084a"`
[INFO] [stderr]    Compiling primes v0.2.0
[INFO] [stderr]    Compiling num-bigint v0.1.40
[INFO] [stderr]    Compiling num-rational v0.1.39
[INFO] [stderr]    Compiling num v0.1.40
[INFO] [stderr]    Compiling rusty_euler v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/question/one_ten.rs:53:21
[INFO] [stderr]    |
[INFO] [stderr] 53 |                 let mut flip = flip.as_mut_vec();
[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 4.79s
[INFO] running `"docker" "inspect" "2a75fa27ef0af6544f29a3ff0c93d090c5b6d639f5ab1e8d1c2e091591c8084a"`
[INFO] running `"docker" "rm" "-f" "2a75fa27ef0af6544f29a3ff0c93d090c5b6d639f5ab1e8d1c2e091591c8084a"`
[INFO] [stdout] 2a75fa27ef0af6544f29a3ff0c93d090c5b6d639f5ab1e8d1c2e091591c8084a
[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/matthewa150/rusty_euler:/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] a370385867da26e1284b230a85de40fb6f8f40076095214aa08e70fcd4c8f98f
[INFO] running `"docker" "start" "-a" "a370385867da26e1284b230a85de40fb6f8f40076095214aa08e70fcd4c8f98f"`
[INFO] [stderr]    Compiling rusty_euler v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/question/one_ten.rs:53:21
[INFO] [stderr]    |
[INFO] [stderr] 53 |                 let mut flip = flip.as_mut_vec();
[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 0.95s
[INFO] running `"docker" "inspect" "a370385867da26e1284b230a85de40fb6f8f40076095214aa08e70fcd4c8f98f"`
[INFO] running `"docker" "rm" "-f" "a370385867da26e1284b230a85de40fb6f8f40076095214aa08e70fcd4c8f98f"`
[INFO] [stdout] a370385867da26e1284b230a85de40fb6f8f40076095214aa08e70fcd4c8f98f
[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/matthewa150/rusty_euler:/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] 1f22b02c008202ca47749868186016fb018df61e12521c2e795852e5170d23c3
[INFO] running `"docker" "start" "-a" "1f22b02c008202ca47749868186016fb018df61e12521c2e795852e5170d23c3"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rusty_euler-d2d263e208b93218
[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" "1f22b02c008202ca47749868186016fb018df61e12521c2e795852e5170d23c3"`
[INFO] running `"docker" "rm" "-f" "1f22b02c008202ca47749868186016fb018df61e12521c2e795852e5170d23c3"`
[INFO] [stdout] 1f22b02c008202ca47749868186016fb018df61e12521c2e795852e5170d23c3