[INFO] updating cached repository https://github.com/rschifflin/rust-pubsub
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b07e4f397f298b5bfc7e977b2a18db0a64d010e1
[INFO] testing rschifflin/rust-pubsub against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Frschifflin%2Frust-pubsub" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rschifflin/rust-pubsub on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/rschifflin/rust-pubsub
[INFO] finished tweaking git repo https://github.com/rschifflin/rust-pubsub
[INFO] tweaked toml for git repo https://github.com/rschifflin/rust-pubsub written to work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/rschifflin/rust-pubsub already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] d7b047460656ca94073b7dd16cc863e05b0aa8fa9dbe663521c207af85e7a50a
[INFO] running `"docker" "start" "-a" "d7b047460656ca94073b7dd16cc863e05b0aa8fa9dbe663521c207af85e7a50a"`
[INFO] [stderr]    Compiling pubsub v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(std_misc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0369]: binary operation `+` cannot be applied to type `std::vec::Vec<Event<Channel, Payload>>`
[INFO] [stderr]   --> src/lib.rs:49:33
[INFO] [stderr]    |
[INFO] [stderr] 49 |         self.event_queue = head + &*tail;
[INFO] [stderr]    |                            ---- ^ ------ &[Event<Channel, Payload>]
[INFO] [stderr]    |                            |
[INFO] [stderr]    |                            std::vec::Vec<Event<Channel, Payload>>
[INFO] [stderr]    |
[INFO] [stderr]    = note: an implementation of `std::ops::Add` might be missing for `std::vec::Vec<Event<Channel, Payload>>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0369, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0369`.
[INFO] [stderr] error: Could not compile `pubsub`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d7b047460656ca94073b7dd16cc863e05b0aa8fa9dbe663521c207af85e7a50a"`
[INFO] running `"docker" "rm" "-f" "d7b047460656ca94073b7dd16cc863e05b0aa8fa9dbe663521c207af85e7a50a"`
[INFO] [stdout] d7b047460656ca94073b7dd16cc863e05b0aa8fa9dbe663521c207af85e7a50a