[INFO] fetching crate generic-channel 0.2.0...
[INFO] checking generic-channel-0.2.0 against master#90442458ac46b1d5eed752c316da25450f67285b for pr-81477
[INFO] extracting crate generic-channel 0.2.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate generic-channel 0.2.0 on toolchain 90442458ac46b1d5eed752c316da25450f67285b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate generic-channel 0.2.0
[INFO] finished tweaking crates.io crate generic-channel 0.2.0
[INFO] tweaked toml for crates.io crate generic-channel 0.2.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aed5391e5c0b328f8c81d30adc111e71fea7e5346d52df13eb8af514d9892123
[INFO] running `Command { std: "docker" "start" "-a" "aed5391e5c0b328f8c81d30adc111e71fea7e5346d52df13eb8af514d9892123", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aed5391e5c0b328f8c81d30adc111e71fea7e5346d52df13eb8af514d9892123", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aed5391e5c0b328f8c81d30adc111e71fea7e5346d52df13eb8af514d9892123", kill_on_drop: false }`
[INFO] [stdout] aed5391e5c0b328f8c81d30adc111e71fea7e5346d52df13eb8af514d9892123
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ac2c79fe3d360520190ea268f4b405e76d2f744873d7f2af19848b8876a48aee
[INFO] running `Command { std: "docker" "start" "-a" "ac2c79fe3d360520190ea268f4b405e76d2f744873d7f2af19848b8876a48aee", kill_on_drop: false }`
[INFO] [stderr]     Checking generic-channel v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stdout] error[E0596]: cannot borrow `*sender` as mutable, as `sender` is not declared as mutable
[INFO] [stdout]   --> src/lib.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |         let sender: Box<dyn Sender<u8>> = Box::new(sender);
[INFO] [stdout]    |             ------ help: consider changing this to be mutable: `mut sender`
[INFO] [stdout] 54 |         sender.try_send(1).expect("send");
[INFO] [stdout]    |         ^^^^^^ cannot borrow as mutable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow `*sender` as mutable, as `sender` is not declared as mutable
[INFO] [stdout]   --> src/lib.rs:57:20
[INFO] [stdout]    |
[INFO] [stdout] 53 |         let sender: Box<dyn Sender<u8>> = Box::new(sender);
[INFO] [stdout]    |             ------ help: consider changing this to be mutable: `mut sender`
[INFO] [stdout] ...
[INFO] [stdout] 57 |         assert_eq!(sender.try_send(2), Err(TrySendError::Disconnected(2u8)));
[INFO] [stdout]    |                    ^^^^^^ cannot borrow as mutable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `generic-channel`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "ac2c79fe3d360520190ea268f4b405e76d2f744873d7f2af19848b8876a48aee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac2c79fe3d360520190ea268f4b405e76d2f744873d7f2af19848b8876a48aee", kill_on_drop: false }`
[INFO] [stdout] ac2c79fe3d360520190ea268f4b405e76d2f744873d7f2af19848b8876a48aee