[INFO] updating cached repository olgert/mr
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/olgert/mr
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/olgert/mr" "work/ex/beta-1.38-1/sources/1.37.0/gh/olgert/mr"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/olgert/mr'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/olgert/mr" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olgert/mr"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olgert/mr'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 750296e9e945b8e2e9f33816a0bcab03da59c021
[INFO] sha for GitHub repo olgert/mr: 750296e9e945b8e2e9f33816a0bcab03da59c021
[INFO] validating manifest of olgert/mr 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 olgert/mr 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 olgert/mr
[INFO] finished frobbing olgert/mr
[INFO] frobbed toml for olgert/mr written to work/ex/beta-1.38-1/sources/1.37.0/gh/olgert/mr/Cargo.toml
[INFO] started frobbing olgert/mr
[INFO] finished frobbing olgert/mr
[INFO] frobbed toml for olgert/mr written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olgert/mr/Cargo.toml
[INFO] crate olgert/mr 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 olgert/mr 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/olgert/mr:/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] 8b5cdc5640b5e61b70cb079ece2f8181880a993837853e542dd4574be3786928
[INFO] running `"docker" "start" "-a" "8b5cdc5640b5e61b70cb079ece2f8181880a993837853e542dd4574be3786928"`
[INFO] [stderr]    Compiling nix v0.13.0
[INFO] [stderr]    Compiling mr v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `spwn`
[INFO] [stderr]    --> src/main.rs:121:13
[INFO] [stderr]     |
[INFO] [stderr] 121 |         let spwn = thread::Builder::new()
[INFO] [stderr]     |             ^^^^ help: consider prefixing with an underscore: `_spwn`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `RunResult`
[INFO] [stderr]    --> src/main.rs:162:1
[INFO] [stderr]     |
[INFO] [stderr] 162 | struct RunResult {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.44s
[INFO] running `"docker" "inspect" "8b5cdc5640b5e61b70cb079ece2f8181880a993837853e542dd4574be3786928"`
[INFO] running `"docker" "rm" "-f" "8b5cdc5640b5e61b70cb079ece2f8181880a993837853e542dd4574be3786928"`
[INFO] [stdout] 8b5cdc5640b5e61b70cb079ece2f8181880a993837853e542dd4574be3786928
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/olgert/mr:/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] 21645dc32c0a744dba26a5b1e3d42a996d15b8bdcaf379683ac770eddb8153eb
[INFO] running `"docker" "start" "-a" "21645dc32c0a744dba26a5b1e3d42a996d15b8bdcaf379683ac770eddb8153eb"`
[INFO] [stderr]    Compiling mr v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `spwn`
[INFO] [stderr]    --> src/main.rs:121:13
[INFO] [stderr]     |
[INFO] [stderr] 121 |         let spwn = thread::Builder::new()
[INFO] [stderr]     |             ^^^^ help: consider prefixing with an underscore: `_spwn`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `RunResult`
[INFO] [stderr]    --> src/main.rs:162:1
[INFO] [stderr]     |
[INFO] [stderr] 162 | struct RunResult {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.02s
[INFO] running `"docker" "inspect" "21645dc32c0a744dba26a5b1e3d42a996d15b8bdcaf379683ac770eddb8153eb"`
[INFO] running `"docker" "rm" "-f" "21645dc32c0a744dba26a5b1e3d42a996d15b8bdcaf379683ac770eddb8153eb"`
[INFO] [stdout] 21645dc32c0a744dba26a5b1e3d42a996d15b8bdcaf379683ac770eddb8153eb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/olgert/mr:/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] 39449b343c318ea7cced5db703054a3c22c50c5de12642de47cd221fc2600f97
[INFO] running `"docker" "start" "-a" "39449b343c318ea7cced5db703054a3c22c50c5de12642de47cd221fc2600f97"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[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]      Running /opt/crater/target/debug/deps/mr-59a7bc085de2c96c
[INFO] running `"docker" "inspect" "39449b343c318ea7cced5db703054a3c22c50c5de12642de47cd221fc2600f97"`
[INFO] running `"docker" "rm" "-f" "39449b343c318ea7cced5db703054a3c22c50c5de12642de47cd221fc2600f97"`
[INFO] [stdout] 39449b343c318ea7cced5db703054a3c22c50c5de12642de47cd221fc2600f97