[INFO] fetching crate buffer_io 1.0.0...
[INFO] checking buffer_io-1.0.0 against master#6250d56355d72264ece721e8d0dc95b16a6824b1 for pr-68350
[INFO] extracting crate buffer_io 1.0.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate buffer_io 1.0.0 on toolchain 6250d56355d72264ece721e8d0dc95b16a6824b1
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6250d56355d72264ece721e8d0dc95b16a6824b1" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate buffer_io 1.0.0
[INFO] finished tweaking crates.io crate buffer_io 1.0.0
[INFO] tweaked toml for crates.io crate buffer_io 1.0.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6250d56355d72264ece721e8d0dc95b16a6824b1" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6250d56355d72264ece721e8d0dc95b16a6824b1" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+6250d56355d72264ece721e8d0dc95b16a6824b1" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b5672ef7f142b93f7d16a0f6b6ae51d869f568bc42fd51760b389b3ad79f90d1
[INFO] running `"docker" "start" "-a" "b5672ef7f142b93f7d16a0f6b6ae51d869f568bc42fd51760b389b3ad79f90d1"`
[INFO] [stderr]     Checking buffer_io v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: value assigned to `b` is never read
[INFO] [stderr]    --> src/lib.rs:214:21
[INFO] [stderr]     |
[INFO] [stderr] 214 |             let mut b: u8 = 0;
[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] warning: value assigned to `b` is never read
[INFO] [stderr]    --> src/lib.rs:214:21
[INFO] [stderr]     |
[INFO] [stderr] 214 |             let mut b: u8 = 0;
[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 1.04s
[INFO] running `"docker" "inspect" "b5672ef7f142b93f7d16a0f6b6ae51d869f568bc42fd51760b389b3ad79f90d1"`
[INFO] running `"docker" "rm" "-f" "b5672ef7f142b93f7d16a0f6b6ae51d869f568bc42fd51760b389b3ad79f90d1"`
[INFO] [stdout] b5672ef7f142b93f7d16a0f6b6ae51d869f568bc42fd51760b389b3ad79f90d1