[INFO] updating cached repository https://github.com/IsaacWoods/teensy_kbd
[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] c7fc064d791e54c2f45e2909b87e7eac250aa470
[INFO] testing IsaacWoods/teensy_kbd against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FIsaacWoods%2Fteensy_kbd" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/IsaacWoods/teensy_kbd 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/IsaacWoods/teensy_kbd
[INFO] finished tweaking git repo https://github.com/IsaacWoods/teensy_kbd
[INFO] tweaked toml for git repo https://github.com/IsaacWoods/teensy_kbd written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/IsaacWoods/teensy_kbd 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-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/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] 89820a8934f6e2ab6876beeec80287ac5966537009755131a33cf1574c0a25e2
[INFO] running `"docker" "start" "-a" "89820a8934f6e2ab6876beeec80287ac5966537009755131a33cf1574c0a25e2"`
[INFO] [stderr]    Compiling volatile v0.2.4
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr]    Compiling teensy_kbd v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(lang_items, asm, const_fn, decl_macro)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: language item required, but not found: `eh_personality`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/main.rs:71:70
[INFO] [stderr]    |
[INFO] [stderr] 71 | pub static _VECTORS: [unsafe extern "C" fn() -> !; 2] = [_stack_top, main];
[INFO] [stderr]    |                                                                      ^^^^ expected fn pointer, found fn item
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `unsafe extern "C" fn() -> !`
[INFO] [stderr]               found type `extern "C" fn() {main}`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `teensy_kbd`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "89820a8934f6e2ab6876beeec80287ac5966537009755131a33cf1574c0a25e2"`
[INFO] running `"docker" "rm" "-f" "89820a8934f6e2ab6876beeec80287ac5966537009755131a33cf1574c0a25e2"`
[INFO] [stdout] 89820a8934f6e2ab6876beeec80287ac5966537009755131a33cf1574c0a25e2