[INFO] fetching crate async-core 0.3.1...
[INFO] checking async-core-0.3.1 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1
[INFO] extracting crate async-core 0.3.1 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate async-core 0.3.1
[INFO] finished tweaking crates.io crate async-core 0.3.1
[INFO] tweaked toml for crates.io crate async-core 0.3.1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate async-core 0.3.1 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate async-core 0.3.1 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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c9d2c6bbf1cf21c9a334d6d50295bea370c8c2e5aa24f27001435fdbec814842
[INFO] running `Command { std: "docker" "start" "-a" "c9d2c6bbf1cf21c9a334d6d50295bea370c8c2e5aa24f27001435fdbec814842", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c9d2c6bbf1cf21c9a334d6d50295bea370c8c2e5aa24f27001435fdbec814842", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9d2c6bbf1cf21c9a334d6d50295bea370c8c2e5aa24f27001435fdbec814842", kill_on_drop: false }`
[INFO] [stdout] c9d2c6bbf1cf21c9a334d6d50295bea370c8c2e5aa24f27001435fdbec814842
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b24ea87bfdbc7cdaf8aba8324069480ba2b1c25274c8985f7ea1d4b4f0eb9fe9
[INFO] running `Command { std: "docker" "start" "-a" "b24ea87bfdbc7cdaf8aba8324069480ba2b1c25274c8985f7ea1d4b4f0eb9fe9", kill_on_drop: false }`
[INFO] [stderr]     Checking async-core v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> src/runtime.rs:86:49
[INFO] [stdout]    |
[INFO] [stdout] 86 | pub struct OwnedRuntime<'a>(RuntimeWrapper<'a>, pub(crate) Box<dyn InternalRuntime + 'a>);
[INFO] [stdout]    |            ------------ field in this struct    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> src/runtime.rs:86:49
[INFO] [stdout]    |
[INFO] [stdout] 86 | pub struct OwnedRuntime<'a>(RuntimeWrapper<'a>, pub(crate) Box<dyn InternalRuntime + 'a>);
[INFO] [stdout]    |            ------------ field in this struct    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "b24ea87bfdbc7cdaf8aba8324069480ba2b1c25274c8985f7ea1d4b4f0eb9fe9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b24ea87bfdbc7cdaf8aba8324069480ba2b1c25274c8985f7ea1d4b4f0eb9fe9", kill_on_drop: false }`
[INFO] [stdout] b24ea87bfdbc7cdaf8aba8324069480ba2b1c25274c8985f7ea1d4b4f0eb9fe9