[INFO] fetching crate critical-section 0.2.1...
[INFO] checking critical-section-0.2.1 against try#07fecb9cf34c4979a772ba38c99d6d9144768413 for pr-87710
[INFO] extracting crate critical-section 0.2.1 into /workspace/builds/worker-36/source
[INFO] validating manifest of crates.io crate critical-section 0.2.1 on toolchain 07fecb9cf34c4979a772ba38c99d6d9144768413
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate critical-section 0.2.1
[INFO] finished tweaking crates.io crate critical-section 0.2.1
[INFO] tweaked toml for crates.io crate critical-section 0.2.1 written to /workspace/builds/worker-36/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c842162babd6285c9068f9093bf62e3b4775f54d7f4177967c4096cb65c88685
[INFO] running `Command { std: "docker" "start" "-a" "c842162babd6285c9068f9093bf62e3b4775f54d7f4177967c4096cb65c88685", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c842162babd6285c9068f9093bf62e3b4775f54d7f4177967c4096cb65c88685", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c842162babd6285c9068f9093bf62e3b4775f54d7f4177967c4096cb65c88685", kill_on_drop: false }`
[INFO] [stdout] c842162babd6285c9068f9093bf62e3b4775f54d7f4177967c4096cb65c88685
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ab6ab5a3d146e2572251cc57d7281ddedef85df2a9434d16cbbfa469fcf02504
[INFO] running `Command { std: "docker" "start" "-a" "ab6ab5a3d146e2572251cc57d7281ddedef85df2a9434d16cbbfa469fcf02504", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling critical-section v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking bare-metal v1.0.0
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:103:31
[INFO] [stdout]     |
[INFO] [stdout] 102 |         unsafe fn _critical_section_acquire() -> u8 {
[INFO] [stdout]     |         ------------------------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] 103 |             INIT.call_once(|| unsafe {
[INFO] [stdout]     |                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:103:31
[INFO] [stdout]     |
[INFO] [stdout] 102 |         unsafe fn _critical_section_acquire() -> u8 {
[INFO] [stdout]     |         ------------------------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] 103 |             INIT.call_once(|| unsafe {
[INFO] [stdout]     |                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.02s
[INFO] running `Command { std: "docker" "inspect" "ab6ab5a3d146e2572251cc57d7281ddedef85df2a9434d16cbbfa469fcf02504", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab6ab5a3d146e2572251cc57d7281ddedef85df2a9434d16cbbfa469fcf02504", kill_on_drop: false }`
[INFO] [stdout] ab6ab5a3d146e2572251cc57d7281ddedef85df2a9434d16cbbfa469fcf02504