[INFO] fetching crate maybe-async-channel 1.0.0...
[INFO] testing maybe-async-channel-1.0.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate maybe-async-channel 1.0.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate maybe-async-channel 1.0.0
[INFO] finished tweaking crates.io crate maybe-async-channel 1.0.0
[INFO] tweaked toml for crates.io crate maybe-async-channel 1.0.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate maybe-async-channel 1.0.0 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 6 packages to latest compatible versions
[INFO] [stderr]       Adding async-channel v1.9.0 (available: v2.5.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cce7cfc9ee7d34cf91bb04df606c160f69bb65177c19c812e97c0434854efedb
[INFO] running `Command { std: "docker" "start" "-a" "cce7cfc9ee7d34cf91bb04df606c160f69bb65177c19c812e97c0434854efedb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cce7cfc9ee7d34cf91bb04df606c160f69bb65177c19c812e97c0434854efedb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cce7cfc9ee7d34cf91bb04df606c160f69bb65177c19c812e97c0434854efedb", kill_on_drop: false }`
[INFO] [stdout] cce7cfc9ee7d34cf91bb04df606c160f69bb65177c19c812e97c0434854efedb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 78e425c74ec7667922f0b7d86d7931b3e3619474d815eef55ec148c06584cb6c
[INFO] running `Command { std: "docker" "start" "-a" "78e425c74ec7667922f0b7d86d7931b3e3619474d815eef55ec148c06584cb6c", kill_on_drop: false }`
[INFO] [stderr]    Compiling concurrent-queue v2.5.0
[INFO] [stderr]    Compiling crossbeam-channel v0.5.15
[INFO] [stderr]    Compiling async-channel v1.9.0
[INFO] [stderr]    Compiling maybe-async-channel v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:27:1
[INFO] [stdout]    |
[INFO] [stdout] 27 | #![feature(type_alias_impl_trait)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `impl Trait` in associated types is unstable
[INFO] [stdout]    --> src/lib.rs:137:24
[INFO] [stdout]     |
[INFO] [stdout] 137 |         type Ret<'a> = impl std::future::Future<Output = Result<(), async_channel::SendError<T>>> + 'a where Self: 'a;
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `maybe-async-channel` (lib) due to 2 previous errors
[INFO] [stdout] Some errors have detailed explanations: E0554, E0658.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "78e425c74ec7667922f0b7d86d7931b3e3619474d815eef55ec148c06584cb6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78e425c74ec7667922f0b7d86d7931b3e3619474d815eef55ec148c06584cb6c", kill_on_drop: false }`
[INFO] [stdout] 78e425c74ec7667922f0b7d86d7931b3e3619474d815eef55ec148c06584cb6c
