[INFO] crate r4 1.0.1 is already in cache
[INFO] checking r4-1.0.1 against try#e689e5eaefe96e6dc3ed5bb629c521b7d207aff7 for pr-64398
[INFO] extracting crate r4 1.0.1 into work/builds/worker-0/source
[INFO] validating manifest of crates.io crate r4 1.0.1 on toolchain e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate r4 1.0.1
[INFO] finished tweaking crates.io crate r4 1.0.1
[INFO] tweaked toml for crates.io crate r4 1.0.1 written to work/builds/worker-0/source/Cargo.toml
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 58da2ba2c9644dadc58c85a3fc2494f517d2c0c4af6789e4f0da33bfcd232881
[INFO] running `"docker" "start" "-a" "58da2ba2c9644dadc58c85a3fc2494f517d2c0c4af6789e4f0da33bfcd232881"`
[INFO] [stderr]     Checking r4 v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:407:34
[INFO] [stderr]     |
[INFO] [stderr] 407 |                     iterate![for i in 0..4;
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/lib.rs:433:34
[INFO] [stderr]     |
[INFO] [stderr] 433 |                     iterate![for x in vs.iter();
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/lib.rs:443:34
[INFO] [stderr]     |
[INFO] [stderr] 443 |                     iterate![for x in vs.iter();
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/lib.rs:474:34
[INFO] [stderr]     |
[INFO] [stderr] 474 | ...                   let a = *x + 3;
[INFO] [stderr]     |                           ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/lib.rs:489:34
[INFO] [stderr]     |
[INFO] [stderr] 489 | ...                   let a = *x + 3;
[INFO] [stderr]     |                           ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]    --> src/lib.rs:506:34
[INFO] [stderr]     |
[INFO] [stderr] 506 | ...                   for y in vs.iter();
[INFO] [stderr]     |                           ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/lib.rs:522:34
[INFO] [stderr]     |
[INFO] [stderr] 522 | ...                   let x = *x + 1;
[INFO] [stderr]     |                           ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.36s
[INFO] running `"docker" "inspect" "58da2ba2c9644dadc58c85a3fc2494f517d2c0c4af6789e4f0da33bfcd232881"`
[INFO] running `"docker" "rm" "-f" "58da2ba2c9644dadc58c85a3fc2494f517d2c0c4af6789e4f0da33bfcd232881"`
[INFO] [stdout] 58da2ba2c9644dadc58c85a3fc2494f517d2c0c4af6789e4f0da33bfcd232881