[INFO] updating cached repository 3541/shell
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/3541/shell
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/3541/shell" "work/ex/beta-1.38-1/sources/1.37.0/gh/3541/shell"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/3541/shell'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/3541/shell" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/3541/shell"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/3541/shell'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 173aa3509cd1cccc8422ffee622efb2fb0661406
[INFO] sha for GitHub repo 3541/shell: 173aa3509cd1cccc8422ffee622efb2fb0661406
[INFO] validating manifest of 3541/shell 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 3541/shell 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 3541/shell
[INFO] finished frobbing 3541/shell
[INFO] frobbed toml for 3541/shell written to work/ex/beta-1.38-1/sources/1.37.0/gh/3541/shell/Cargo.toml
[INFO] started frobbing 3541/shell
[INFO] finished frobbing 3541/shell
[INFO] frobbed toml for 3541/shell written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/3541/shell/Cargo.toml
[INFO] crate 3541/shell 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 3541/shell 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/3541/shell:/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] 73bd7652a1c1c13c01205618fd4fd90934aa8df6e476497d6b3935e219dd651b
[INFO] running `"docker" "start" "-a" "73bd7652a1c1c13c01205618fd4fd90934aa8df6e476497d6b3935e219dd651b"`
[INFO] [stderr]    Compiling nix v0.7.0
[INFO] [stderr]    Compiling shell v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `c_line` is never read
[INFO] [stderr]   --> src/main.rs:31:13
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let mut c_line = String::new();
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.89s
[INFO] running `"docker" "inspect" "73bd7652a1c1c13c01205618fd4fd90934aa8df6e476497d6b3935e219dd651b"`
[INFO] running `"docker" "rm" "-f" "73bd7652a1c1c13c01205618fd4fd90934aa8df6e476497d6b3935e219dd651b"`
[INFO] [stdout] 73bd7652a1c1c13c01205618fd4fd90934aa8df6e476497d6b3935e219dd651b
[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/3541/shell:/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] 51e6976eb5c1ced99c6cbf67428760dd45834245a17d24391f539d3b15376086
[INFO] running `"docker" "start" "-a" "51e6976eb5c1ced99c6cbf67428760dd45834245a17d24391f539d3b15376086"`
[INFO] [stderr]    Compiling shell v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `c_line` is never read
[INFO] [stderr]   --> src/main.rs:31:13
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let mut c_line = String::new();
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `"docker" "inspect" "51e6976eb5c1ced99c6cbf67428760dd45834245a17d24391f539d3b15376086"`
[INFO] running `"docker" "rm" "-f" "51e6976eb5c1ced99c6cbf67428760dd45834245a17d24391f539d3b15376086"`
[INFO] [stdout] 51e6976eb5c1ced99c6cbf67428760dd45834245a17d24391f539d3b15376086
[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/3541/shell:/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] eb2056b2cbfa858a5ff8b5521933eab6f67e81c290513360c5941499d981f1d6
[INFO] running `"docker" "start" "-a" "eb2056b2cbfa858a5ff8b5521933eab6f67e81c290513360c5941499d981f1d6"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/shell-15cf56414f5d3491
[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" "eb2056b2cbfa858a5ff8b5521933eab6f67e81c290513360c5941499d981f1d6"`
[INFO] running `"docker" "rm" "-f" "eb2056b2cbfa858a5ff8b5521933eab6f67e81c290513360c5941499d981f1d6"`
[INFO] [stdout] eb2056b2cbfa858a5ff8b5521933eab6f67e81c290513360c5941499d981f1d6