[INFO] crate generic-channel 0.2.0 is already in cache
[INFO] extracting crate generic-channel 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/generic-channel/0.2.0
[INFO] extracting crate generic-channel 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/generic-channel/0.2.0
[INFO] validating manifest of generic-channel-0.2.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of generic-channel-0.2.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing generic-channel-0.2.0
[INFO] finished frobbing generic-channel-0.2.0
[INFO] frobbed toml for generic-channel-0.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/generic-channel/0.2.0/Cargo.toml
[INFO] started frobbing generic-channel-0.2.0
[INFO] finished frobbing generic-channel-0.2.0
[INFO] frobbed toml for generic-channel-0.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/generic-channel/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing generic-channel-0.2.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/generic-channel/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] fd9216e938f6969f0c99142ea480f60ac829e20fd42066f023fa50902895e1dd
[INFO] running `"docker" "start" "-a" "fd9216e938f6969f0c99142ea480f60ac829e20fd42066f023fa50902895e1dd"`
[INFO] [stderr]    Compiling generic-channel v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `"docker" "inspect" "fd9216e938f6969f0c99142ea480f60ac829e20fd42066f023fa50902895e1dd"`
[INFO] running `"docker" "rm" "-f" "fd9216e938f6969f0c99142ea480f60ac829e20fd42066f023fa50902895e1dd"`
[INFO] [stdout] fd9216e938f6969f0c99142ea480f60ac829e20fd42066f023fa50902895e1dd
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/generic-channel/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] c0921e9874e9fb8e259510fbaa8b1861f6dfbd4ec48265d0d4101048bac7dd7c
[INFO] running `"docker" "start" "-a" "c0921e9874e9fb8e259510fbaa8b1861f6dfbd4ec48265d0d4101048bac7dd7c"`
[INFO] [stderr]    Compiling generic-channel v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0596]: cannot borrow `*sender` as mutable, as `sender` is not declared as mutable
[INFO] [stderr]   --> src/lib.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |         let sender: Box<dyn Sender<u8>> = Box::new(sender);
[INFO] [stderr]    |             ------ help: consider changing this to be mutable: `mut sender`
[INFO] [stderr] 54 |         sender.try_send(1).expect("send");
[INFO] [stderr]    |         ^^^^^^ cannot borrow as mutable
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow `*sender` as mutable, as `sender` is not declared as mutable
[INFO] [stderr]   --> src/lib.rs:57:20
[INFO] [stderr]    |
[INFO] [stderr] 53 |         let sender: Box<dyn Sender<u8>> = Box::new(sender);
[INFO] [stderr]    |             ------ help: consider changing this to be mutable: `mut sender`
[INFO] [stderr] ...
[INFO] [stderr] 57 |         assert_eq!(sender.try_send(2), Err(TrySendError::Disconnected(2u8)));
[INFO] [stderr]    |                    ^^^^^^ cannot borrow as mutable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0596`.
[INFO] [stderr] error: Could not compile `generic-channel`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c0921e9874e9fb8e259510fbaa8b1861f6dfbd4ec48265d0d4101048bac7dd7c"`
[INFO] running `"docker" "rm" "-f" "c0921e9874e9fb8e259510fbaa8b1861f6dfbd4ec48265d0d4101048bac7dd7c"`
[INFO] [stdout] c0921e9874e9fb8e259510fbaa8b1861f6dfbd4ec48265d0d4101048bac7dd7c