[INFO] updating cached repository squidarth/optimal-line-length
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/squidarth/optimal-line-length
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/squidarth/optimal-line-length" "work/ex/beta-1.38-1/sources/1.37.0/gh/squidarth/optimal-line-length"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/squidarth/optimal-line-length'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/squidarth/optimal-line-length" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/squidarth/optimal-line-length"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/squidarth/optimal-line-length'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8daab2974035469ebe2c850347dcff48bb49dd3a
[INFO] sha for GitHub repo squidarth/optimal-line-length: 8daab2974035469ebe2c850347dcff48bb49dd3a
[INFO] validating manifest of squidarth/optimal-line-length 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 squidarth/optimal-line-length 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 squidarth/optimal-line-length
[INFO] finished frobbing squidarth/optimal-line-length
[INFO] frobbed toml for squidarth/optimal-line-length written to work/ex/beta-1.38-1/sources/1.37.0/gh/squidarth/optimal-line-length/Cargo.toml
[INFO] started frobbing squidarth/optimal-line-length
[INFO] finished frobbing squidarth/optimal-line-length
[INFO] frobbed toml for squidarth/optimal-line-length written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/squidarth/optimal-line-length/Cargo.toml
[INFO] crate squidarth/optimal-line-length 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 squidarth/optimal-line-length 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-2/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/squidarth/optimal-line-length:/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] 5d630dae6ffae50b105f27014804089f8f73ee3dc971f05838131c29f22f615a
[INFO] running `"docker" "start" "-a" "5d630dae6ffae50b105f27014804089f8f73ee3dc971f05838131c29f22f615a"`
[INFO] [stderr]    Compiling line_breaks v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:50:19
[INFO] [stderr]    |
[INFO] [stderr] 50 |               let mut previous_cost: i32;
[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 1.42s
[INFO] running `"docker" "inspect" "5d630dae6ffae50b105f27014804089f8f73ee3dc971f05838131c29f22f615a"`
[INFO] running `"docker" "rm" "-f" "5d630dae6ffae50b105f27014804089f8f73ee3dc971f05838131c29f22f615a"`
[INFO] [stdout] 5d630dae6ffae50b105f27014804089f8f73ee3dc971f05838131c29f22f615a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/squidarth/optimal-line-length:/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] 9dbce9bcd2adc990a53cef91c9c9ce8fec653d5845c33b0289db57dc685fbfc7
[INFO] running `"docker" "start" "-a" "9dbce9bcd2adc990a53cef91c9c9ce8fec653d5845c33b0289db57dc685fbfc7"`
[INFO] [stderr]    Compiling line_breaks v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:50:19
[INFO] [stderr]    |
[INFO] [stderr] 50 |               let mut previous_cost: i32;
[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 0.88s
[INFO] running `"docker" "inspect" "9dbce9bcd2adc990a53cef91c9c9ce8fec653d5845c33b0289db57dc685fbfc7"`
[INFO] running `"docker" "rm" "-f" "9dbce9bcd2adc990a53cef91c9c9ce8fec653d5845c33b0289db57dc685fbfc7"`
[INFO] [stdout] 9dbce9bcd2adc990a53cef91c9c9ce8fec653d5845c33b0289db57dc685fbfc7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/squidarth/optimal-line-length:/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] 528dd176d0b169279006525daf732282d95ace855519f523964af2baec78518a
[INFO] running `"docker" "start" "-a" "528dd176d0b169279006525daf732282d95ace855519f523964af2baec78518a"`
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/line_breaks-f23364fd566871f3
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "528dd176d0b169279006525daf732282d95ace855519f523964af2baec78518a"`
[INFO] running `"docker" "rm" "-f" "528dd176d0b169279006525daf732282d95ace855519f523964af2baec78518a"`
[INFO] [stdout] 528dd176d0b169279006525daf732282d95ace855519f523964af2baec78518a