[INFO] crate buffer_io 1.0.0 is already in cache
[INFO] checking buffer_io-1.0.0 against master#209b2be09fcaff937480d1fbbe8b31646e361c7a for pr-70917
[INFO] extracting crate buffer_io 1.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate buffer_io 1.0.0 on toolchain 209b2be09fcaff937480d1fbbe8b31646e361c7a
[INFO] running `"/workspace/cargo-home/bin/cargo" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "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-6/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+209b2be09fcaff937480d1fbbe8b31646e361c7a" "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] 70d4ab3c32605f8791fc6fcda953eb3029e74f78705b319639133a10f3d2c002
[INFO] running `"docker" "start" "-a" "70d4ab3c32605f8791fc6fcda953eb3029e74f78705b319639133a10f3d2c002"`
[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 0.62s
[INFO] running `"docker" "inspect" "70d4ab3c32605f8791fc6fcda953eb3029e74f78705b319639133a10f3d2c002"`
[INFO] running `"docker" "rm" "-f" "70d4ab3c32605f8791fc6fcda953eb3029e74f78705b319639133a10f3d2c002"`
[INFO] [stdout] 70d4ab3c32605f8791fc6fcda953eb3029e74f78705b319639133a10f3d2c002
