[INFO] updating cached repository jacobvaneijk/dmr
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jacobvaneijk/dmr
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jacobvaneijk/dmr" "work/ex/beta-1.38-1/sources/1.37.0/gh/jacobvaneijk/dmr"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jacobvaneijk/dmr'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jacobvaneijk/dmr" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jacobvaneijk/dmr"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jacobvaneijk/dmr'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b0c6d6be3c20f30371995b74866af4ecf4e77ac8
[INFO] sha for GitHub repo jacobvaneijk/dmr: b0c6d6be3c20f30371995b74866af4ecf4e77ac8
[INFO] validating manifest of jacobvaneijk/dmr 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 jacobvaneijk/dmr 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 jacobvaneijk/dmr
[INFO] finished frobbing jacobvaneijk/dmr
[INFO] frobbed toml for jacobvaneijk/dmr written to work/ex/beta-1.38-1/sources/1.37.0/gh/jacobvaneijk/dmr/Cargo.toml
[INFO] started frobbing jacobvaneijk/dmr
[INFO] finished frobbing jacobvaneijk/dmr
[INFO] frobbed toml for jacobvaneijk/dmr written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jacobvaneijk/dmr/Cargo.toml
[INFO] crate jacobvaneijk/dmr 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 jacobvaneijk/dmr 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jacobvaneijk/dmr:/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] d8ff389c4296c8d478becea3aeca10dc533e453a56cb8248435f25ff92be06ed
[INFO] running `"docker" "start" "-a" "d8ff389c4296c8d478becea3aeca10dc533e453a56cb8248435f25ff92be06ed"`
[INFO] [stderr]    Compiling dmr v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `output`
[INFO] [stderr]   --> src/main.rs:47:9
[INFO] [stderr]    |
[INFO] [stderr] 47 |     let output = match matches.opt_str("o") {
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_output`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/driver.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut src = match read_file(filename) {
[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 1.28s
[INFO] running `"docker" "inspect" "d8ff389c4296c8d478becea3aeca10dc533e453a56cb8248435f25ff92be06ed"`
[INFO] running `"docker" "rm" "-f" "d8ff389c4296c8d478becea3aeca10dc533e453a56cb8248435f25ff92be06ed"`
[INFO] [stdout] d8ff389c4296c8d478becea3aeca10dc533e453a56cb8248435f25ff92be06ed
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jacobvaneijk/dmr:/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] 52f9c977c99c91a7887306a95b6b2489130b0db8d07ac153020b3758a7bad908
[INFO] running `"docker" "start" "-a" "52f9c977c99c91a7887306a95b6b2489130b0db8d07ac153020b3758a7bad908"`
[INFO] [stderr]    Compiling dmr v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `output`
[INFO] [stderr]   --> src/main.rs:47:9
[INFO] [stderr]    |
[INFO] [stderr] 47 |     let output = match matches.opt_str("o") {
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_output`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/driver.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut src = match read_file(filename) {
[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 0.84s
[INFO] running `"docker" "inspect" "52f9c977c99c91a7887306a95b6b2489130b0db8d07ac153020b3758a7bad908"`
[INFO] running `"docker" "rm" "-f" "52f9c977c99c91a7887306a95b6b2489130b0db8d07ac153020b3758a7bad908"`
[INFO] [stdout] 52f9c977c99c91a7887306a95b6b2489130b0db8d07ac153020b3758a7bad908
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jacobvaneijk/dmr:/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] 6cab227baeab3a779d03e1ad52f78e5bf28d1e8051c2c61148763cb31a43b8d3
[INFO] running `"docker" "start" "-a" "6cab227baeab3a779d03e1ad52f78e5bf28d1e8051c2c61148763cb31a43b8d3"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/dmr-e79938decdc04fbc
[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" "6cab227baeab3a779d03e1ad52f78e5bf28d1e8051c2c61148763cb31a43b8d3"`
[INFO] running `"docker" "rm" "-f" "6cab227baeab3a779d03e1ad52f78e5bf28d1e8051c2c61148763cb31a43b8d3"`
[INFO] [stdout] 6cab227baeab3a779d03e1ad52f78e5bf28d1e8051c2c61148763cb31a43b8d3