[INFO] fetching crate nostd_async 0.6.1...
[INFO] checking nostd_async-0.6.1 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate nostd_async 0.6.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate nostd_async 0.6.1 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nostd_async 0.6.1
[INFO] finished tweaking crates.io crate nostd_async 0.6.1
[INFO] tweaked toml for crates.io crate nostd_async 0.6.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate nostd_async 0.6.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded volatile-register v0.2.1
[INFO] [stderr]   Downloaded futures-micro v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4301e429d70c5957bb9c9d0196b8667453c15fd75e942d2901588d67a7f9ab5c
[INFO] running `Command { std: "docker" "start" "-a" "4301e429d70c5957bb9c9d0196b8667453c15fd75e942d2901588d67a7f9ab5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4301e429d70c5957bb9c9d0196b8667453c15fd75e942d2901588d67a7f9ab5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4301e429d70c5957bb9c9d0196b8667453c15fd75e942d2901588d67a7f9ab5c", kill_on_drop: false }`
[INFO] [stdout] 4301e429d70c5957bb9c9d0196b8667453c15fd75e942d2901588d67a7f9ab5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTDOCFLAGS=--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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2911688acb3e9677a5a28f46f97e7526dbb2a3578947ac8d9e3380758fb2d0d3
[INFO] running `Command { std: "docker" "start" "-a" "2911688acb3e9677a5a28f46f97e7526dbb2a3578947ac8d9e3380758fb2d0d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking futures-micro v0.5.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking nostd_async v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `insert_front` is never used
[INFO] [stdout]   --> src/linked_list.rs:98:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | pub trait LinkedListItem: Sized {
[INFO] [stdout]    |           -------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 98 |     fn insert_front(&self, cs: &CriticalSection) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.64s
[INFO] running `Command { std: "docker" "inspect" "2911688acb3e9677a5a28f46f97e7526dbb2a3578947ac8d9e3380758fb2d0d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2911688acb3e9677a5a28f46f97e7526dbb2a3578947ac8d9e3380758fb2d0d3", kill_on_drop: false }`
[INFO] [stdout] 2911688acb3e9677a5a28f46f97e7526dbb2a3578947ac8d9e3380758fb2d0d3