[INFO] updating cached repository LiteUnder/testing_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/LiteUnder/testing_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/LiteUnder/testing_rust" "work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/LiteUnder/testing_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/LiteUnder/testing_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/LiteUnder/testing_rust" "work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/LiteUnder/testing_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/LiteUnder/testing_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b5f19a3e64bea5039ce205c45b934a0492d3d494
[INFO] sha for GitHub repo LiteUnder/testing_rust: b5f19a3e64bea5039ce205c45b934a0492d3d494
[INFO] validating manifest of LiteUnder/testing_rust on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of LiteUnder/testing_rust on toolchain try#7fea0229842e79db1159ea58ad9a653b288efee9
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing LiteUnder/testing_rust
[INFO] finished frobbing LiteUnder/testing_rust
[INFO] frobbed toml for LiteUnder/testing_rust written to work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/LiteUnder/testing_rust/Cargo.toml
[INFO] started frobbing LiteUnder/testing_rust
[INFO] finished frobbing LiteUnder/testing_rust
[INFO] frobbed toml for LiteUnder/testing_rust written to work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/LiteUnder/testing_rust/Cargo.toml
[INFO] crate LiteUnder/testing_rust has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing LiteUnder/testing_rust against master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54 for pr-57967
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-4/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/LiteUnder/testing_rust:/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=forbid" "-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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "build" "--frozen"`
[INFO] [stdout] 3b538fde3b5363ce876da49e0cf8e360d71504c283d75fc3f00bade467feefac
[INFO] running `"docker" "start" "-a" "3b538fde3b5363ce876da49e0cf8e360d71504c283d75fc3f00bade467feefac"`
[INFO] [stderr]    Compiling testing_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/main.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let x = Some(5);
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/main.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let y: Option<i8> = None;
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.40s
[INFO] running `"docker" "inspect" "3b538fde3b5363ce876da49e0cf8e360d71504c283d75fc3f00bade467feefac"`
[INFO] running `"docker" "rm" "-f" "3b538fde3b5363ce876da49e0cf8e360d71504c283d75fc3f00bade467feefac"`
[INFO] [stdout] 3b538fde3b5363ce876da49e0cf8e360d71504c283d75fc3f00bade467feefac
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-4/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/LiteUnder/testing_rust:/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=forbid" "-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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] 580bb6111c5fee6bf649eb1de0c3e31e6423599139a3e3040482d3f671333fbc
[INFO] running `"docker" "start" "-a" "580bb6111c5fee6bf649eb1de0c3e31e6423599139a3e3040482d3f671333fbc"`
[INFO] [stderr]    Compiling testing_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/main.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let x = Some(5);
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/main.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let y: Option<i8> = None;
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `"docker" "inspect" "580bb6111c5fee6bf649eb1de0c3e31e6423599139a3e3040482d3f671333fbc"`
[INFO] running `"docker" "rm" "-f" "580bb6111c5fee6bf649eb1de0c3e31e6423599139a3e3040482d3f671333fbc"`
[INFO] [stdout] 580bb6111c5fee6bf649eb1de0c3e31e6423599139a3e3040482d3f671333fbc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-4/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/LiteUnder/testing_rust:/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=forbid" "-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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen"`
[INFO] [stdout] 81c722f2f6bc340a5d7453a4a263a4ae8dcb690fabd6ba585966f0b1b8b2fc83
[INFO] running `"docker" "start" "-a" "81c722f2f6bc340a5d7453a4a263a4ae8dcb690fabd6ba585966f0b1b8b2fc83"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/testing_rust-3b9dd38403979154
[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" "81c722f2f6bc340a5d7453a4a263a4ae8dcb690fabd6ba585966f0b1b8b2fc83"`
[INFO] running `"docker" "rm" "-f" "81c722f2f6bc340a5d7453a4a263a4ae8dcb690fabd6ba585966f0b1b8b2fc83"`
[INFO] [stdout] 81c722f2f6bc340a5d7453a4a263a4ae8dcb690fabd6ba585966f0b1b8b2fc83