[INFO] fetching crate generic-channel 0.2.0...
[INFO] checking generic-channel-0.2.0 against master#3e826bb11228508fbe749e594038d6727208aa94 for pr-82322
[INFO] extracting crate generic-channel 0.2.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate generic-channel 0.2.0 on toolchain 3e826bb11228508fbe749e594038d6727208aa94
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "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-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4d32c610f71195ea89536dc868a94a583c34ab2d13b3d344cc2cc72bd5da525a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4d32c610f71195ea89536dc868a94a583c34ab2d13b3d344cc2cc72bd5da525a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4d32c610f71195ea89536dc868a94a583c34ab2d13b3d344cc2cc72bd5da525a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d32c610f71195ea89536dc868a94a583c34ab2d13b3d344cc2cc72bd5da525a", kill_on_drop: false }`
[INFO] [stdout] 4d32c610f71195ea89536dc868a94a583c34ab2d13b3d344cc2cc72bd5da525a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f8c0662befe4ba616f5d1ec23e8b6e469c637631f40b492f78017fa7281cd03b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f8c0662befe4ba616f5d1ec23e8b6e469c637631f40b492f78017fa7281cd03b", kill_on_drop: false }`
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]     Checking generic-channel v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[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" "f8c0662befe4ba616f5d1ec23e8b6e469c637631f40b492f78017fa7281cd03b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8c0662befe4ba616f5d1ec23e8b6e469c637631f40b492f78017fa7281cd03b", kill_on_drop: false }`
[INFO] [stdout] f8c0662befe4ba616f5d1ec23e8b6e469c637631f40b492f78017fa7281cd03b