[INFO] fetching crate async-gcode 0.2.0...
[INFO] checking async-gcode-0.2.0 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate async-gcode 0.2.0 into /workspace/builds/worker-89/source
[INFO] validating manifest of crates.io crate async-gcode 0.2.0 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-gcode 0.2.0
[INFO] finished tweaking crates.io crate async-gcode 0.2.0
[INFO] tweaked toml for crates.io crate async-gcode 0.2.0 written to /workspace/builds/worker-89/source/Cargo.toml
[INFO] crate crates.io crate async-gcode 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8075214bf78bcb0adddb553690e33f71da4921d60e9d177ae0657aecd174ff06
[INFO] running `Command { std: "docker" "start" "-a" "8075214bf78bcb0adddb553690e33f71da4921d60e9d177ae0657aecd174ff06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8075214bf78bcb0adddb553690e33f71da4921d60e9d177ae0657aecd174ff06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8075214bf78bcb0adddb553690e33f71da4921d60e9d177ae0657aecd174ff06", kill_on_drop: false }`
[INFO] [stdout] 8075214bf78bcb0adddb553690e33f71da4921d60e9d177ae0657aecd174ff06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4b7f55ac85ed0d21f4191ef6ea96e4fa84501f4dee01e8bf979c63ecbf7832b4
[INFO] running `Command { std: "docker" "start" "-a" "4b7f55ac85ed0d21f4191ef6ea96e4fa84501f4dee01e8bf979c63ecbf7832b4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]     Checking once_cell v1.4.0
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]     Checking either v1.6.0
[INFO] [stderr]     Checking pin-project-lite v0.1.7
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking async-gcode v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/stream.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | /     pin_project! {
[INFO] [stdout] 42 | |         pub(crate) struct PushBack<S: TryStream> {
[INFO] [stdout] 43 | |             #[pin]
[INFO] [stdout] 44 | |             stream: S,
[INFO] [stdout] 45 | |             val: Option<S::Ok>,
[INFO] [stdout] 46 | |         }
[INFO] [stdout] 47 | |     }
[INFO] [stdout]    | |_____^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `$crate::__pin_project_internal` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/stream.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | /     pin_project! {
[INFO] [stdout] 42 | |         pub(crate) struct PushBack<S: TryStream> {
[INFO] [stdout] 43 | |             #[pin]
[INFO] [stdout] 44 | |             stream: S,
[INFO] [stdout] 45 | |             val: Option<S::Ok>,
[INFO] [stdout] 46 | |         }
[INFO] [stdout] 47 | |     }
[INFO] [stdout]    | |_____^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `$crate::__pin_project_internal` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.51s
[INFO] running `Command { std: "docker" "inspect" "4b7f55ac85ed0d21f4191ef6ea96e4fa84501f4dee01e8bf979c63ecbf7832b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b7f55ac85ed0d21f4191ef6ea96e4fa84501f4dee01e8bf979c63ecbf7832b4", kill_on_drop: false }`
[INFO] [stdout] 4b7f55ac85ed0d21f4191ef6ea96e4fa84501f4dee01e8bf979c63ecbf7832b4