[INFO] fetching crate generic-channel 0.2.0...
[INFO] checking generic-channel-0.2.0 against master#506512391b1a75ae450d36c9420978402a91abcc for pr-125384
[INFO] extracting crate generic-channel 0.2.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate generic-channel 0.2.0 on toolchain 506512391b1a75ae450d36c9420978402a91abcc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "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-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "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 cfg-if v0.1.10 (latest: v1.0.0)
[INFO] [stderr]       Adding crossbeam-channel v0.3.9 (latest: v0.5.13)
[INFO] [stderr]       Adding crossbeam-utils v0.6.6 (latest: v0.8.20)
[INFO] [stderr]       Adding futures v0.1.31 (latest: v0.3.30)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e5925daf8dbe252a6b0e730e8b82c4275d51f09773aac7cac202bb41634302a1
[INFO] running `Command { std: "docker" "start" "-a" "e5925daf8dbe252a6b0e730e8b82c4275d51f09773aac7cac202bb41634302a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e5925daf8dbe252a6b0e730e8b82c4275d51f09773aac7cac202bb41634302a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e5925daf8dbe252a6b0e730e8b82c4275d51f09773aac7cac202bb41634302a1", kill_on_drop: false }`
[INFO] [stdout] e5925daf8dbe252a6b0e730e8b82c4275d51f09773aac7cac202bb41634302a1
[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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 12bcba78acd3e13c8dcb8b5fc9e206458d1818266e8113c578ec336700213313
[INFO] running `Command { std: "docker" "start" "-a" "12bcba78acd3e13c8dcb8b5fc9e206458d1818266e8113c578ec336700213313", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.10
[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:53:13
[INFO] [stdout]    |
[INFO] [stdout] 53 |         let sender: Box<dyn Sender<u8>> = Box::new(sender);
[INFO] [stdout]    |             ^^^^^^ not mutable
[INFO] [stdout] 54 |         sender.try_send(1).expect("send");
[INFO] [stdout]    |         ------ cannot borrow as mutable
[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] help: consider changing this to be mutable
[INFO] [stdout]    |
[INFO] [stdout] 53 |         let mut sender: Box<dyn Sender<u8>> = Box::new(sender);
[INFO] [stdout]    |             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[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` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "12bcba78acd3e13c8dcb8b5fc9e206458d1818266e8113c578ec336700213313", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12bcba78acd3e13c8dcb8b5fc9e206458d1818266e8113c578ec336700213313", kill_on_drop: false }`
[INFO] [stdout] 12bcba78acd3e13c8dcb8b5fc9e206458d1818266e8113c578ec336700213313
[INFO] checking generic-channel-0.2.0 against try#dae34b759e282c069aa28752564694effd121a63 for pr-125384
[INFO] extracting crate generic-channel 0.2.0 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate generic-channel 0.2.0 on toolchain dae34b759e282c069aa28752564694effd121a63
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "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-2-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "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 cfg-if v0.1.10 (latest: v1.0.0)
[INFO] [stderr]       Adding crossbeam-channel v0.3.9 (latest: v0.5.13)
[INFO] [stderr]       Adding crossbeam-utils v0.6.6 (latest: v0.8.20)
[INFO] [stderr]       Adding futures v0.1.31 (latest: v0.3.30)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fa4ab49b738c66292328d1e777a3492fa88e90a25def82bf6e99056c24276675
[INFO] running `Command { std: "docker" "start" "-a" "fa4ab49b738c66292328d1e777a3492fa88e90a25def82bf6e99056c24276675", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fa4ab49b738c66292328d1e777a3492fa88e90a25def82bf6e99056c24276675", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa4ab49b738c66292328d1e777a3492fa88e90a25def82bf6e99056c24276675", kill_on_drop: false }`
[INFO] [stdout] fa4ab49b738c66292328d1e777a3492fa88e90a25def82bf6e99056c24276675
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8429c86e5d3d9deea7787d14b167ed6052b759ee3c2c27e8f40a925b875e2271
[INFO] running `Command { std: "docker" "start" "-a" "8429c86e5d3d9deea7787d14b167ed6052b759ee3c2c27e8f40a925b875e2271", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] skipping non-2021 edition `2018`
[INFO] running `Command { std: "docker" "inspect" "8429c86e5d3d9deea7787d14b167ed6052b759ee3c2c27e8f40a925b875e2271", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8429c86e5d3d9deea7787d14b167ed6052b759ee3c2c27e8f40a925b875e2271", kill_on_drop: false }`
[INFO] [stdout] 8429c86e5d3d9deea7787d14b167ed6052b759ee3c2c27e8f40a925b875e2271