[INFO] updating cached repository amk91/config_exchanger
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/amk91/config_exchanger
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/amk91/config_exchanger" "work/ex/beta-1.37-6/sources/1.36.0/gh/amk91/config_exchanger"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/amk91/config_exchanger'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/amk91/config_exchanger" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/amk91/config_exchanger"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/amk91/config_exchanger'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4f6d4b4dba2625887202d3e8b3697f65e21b1fd4
[INFO] sha for GitHub repo amk91/config_exchanger: 4f6d4b4dba2625887202d3e8b3697f65e21b1fd4
[INFO] validating manifest of amk91/config_exchanger on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of amk91/config_exchanger on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing amk91/config_exchanger
[INFO] finished frobbing amk91/config_exchanger
[INFO] frobbed toml for amk91/config_exchanger written to work/ex/beta-1.37-6/sources/1.36.0/gh/amk91/config_exchanger/Cargo.toml
[INFO] started frobbing amk91/config_exchanger
[INFO] finished frobbing amk91/config_exchanger
[INFO] frobbed toml for amk91/config_exchanger written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/amk91/config_exchanger/Cargo.toml
[INFO] crate amk91/config_exchanger already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing amk91/config_exchanger against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/amk91/config_exchanger:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 902c68cb48b73ca7ae3de67be94dfe8bfc120e2504c30cd949a843801c095f83
[INFO] running `"docker" "start" "-a" "902c68cb48b73ca7ae3de67be94dfe8bfc120e2504c30cd949a843801c095f83"`
[INFO] [stderr]    Compiling xmlparser v0.6.0
[INFO] [stderr]    Compiling config_exchanger v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:244:21
[INFO] [stderr]     |
[INFO] [stderr] 244 |                 let mut buffer = String::from(whitespaces.to_str());
[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 3.23s
[INFO] running `"docker" "inspect" "902c68cb48b73ca7ae3de67be94dfe8bfc120e2504c30cd949a843801c095f83"`
[INFO] running `"docker" "rm" "-f" "902c68cb48b73ca7ae3de67be94dfe8bfc120e2504c30cd949a843801c095f83"`
[INFO] [stdout] 902c68cb48b73ca7ae3de67be94dfe8bfc120e2504c30cd949a843801c095f83
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/amk91/config_exchanger:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] e5841ecd30449c104fe00395e0c44f16f3a7568f9e941515e52a09d91633ad6f
[INFO] running `"docker" "start" "-a" "e5841ecd30449c104fe00395e0c44f16f3a7568f9e941515e52a09d91633ad6f"`
[INFO] [stderr]    Compiling config_exchanger v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:244:21
[INFO] [stderr]     |
[INFO] [stderr] 244 |                 let mut buffer = String::from(whitespaces.to_str());
[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 0.83s
[INFO] running `"docker" "inspect" "e5841ecd30449c104fe00395e0c44f16f3a7568f9e941515e52a09d91633ad6f"`
[INFO] running `"docker" "rm" "-f" "e5841ecd30449c104fe00395e0c44f16f3a7568f9e941515e52a09d91633ad6f"`
[INFO] [stdout] e5841ecd30449c104fe00395e0c44f16f3a7568f9e941515e52a09d91633ad6f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/amk91/config_exchanger:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 1f08efaa6d1a3e08af76e19a77f211a4cb79e46b48460a219226fb01ea97a993
[INFO] running `"docker" "start" "-a" "1f08efaa6d1a3e08af76e19a77f211a4cb79e46b48460a219226fb01ea97a993"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/config_exchanger-1a4feb1e89b47719
[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" "1f08efaa6d1a3e08af76e19a77f211a4cb79e46b48460a219226fb01ea97a993"`
[INFO] running `"docker" "rm" "-f" "1f08efaa6d1a3e08af76e19a77f211a4cb79e46b48460a219226fb01ea97a993"`
[INFO] [stdout] 1f08efaa6d1a3e08af76e19a77f211a4cb79e46b48460a219226fb01ea97a993