Dec 12 12:25:23.461 INFO checking keymatrix-0.1.2 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 12:25:23.461 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-5/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 12 12:25:23.901 INFO [stdout] 5609901246e5fe232cd9a8d1940cd0d248923b320627ce86c5b793249f18060f
Dec 12 12:25:23.901 INFO running `"docker" "start" "-a" "5609901246e5fe232cd9a8d1940cd0d248923b320627ce86c5b793249f18060f"`
Dec 12 12:25:24.628 INFO [stderr] usermod: no changes
Dec 12 12:25:24.740 INFO [stderr]    Compiling atsamd21g18a v0.3.1
Dec 12 12:25:24.748 INFO [stderr]    Compiling cortex-m v0.3.1
Dec 12 12:25:24.748 INFO [stderr]    Compiling cortex-m-rtfm v0.3.4
Dec 12 12:25:24.748 INFO [stderr]     Checking bitfield v0.13.1
Dec 12 12:25:24.748 INFO [stderr]     Checking rtfm-core v0.2.0
Dec 12 12:25:24.748 INFO [stderr]     Checking panic-abort v0.2.0
Dec 12 12:25:24.748 INFO [stderr]    Compiling mashup-impl v0.1.9
Dec 12 12:25:24.754 INFO [stderr]    Compiling syn v0.14.9
Dec 12 12:25:24.916 INFO [stderr] error[E0557]: feature has been removed
Dec 12 12:25:24.916 INFO [stderr]   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:22:12
Dec 12 12:25:24.916 INFO [stderr]    |
Dec 12 12:25:24.916 INFO [stderr] 22 | #![feature(panic_implementation)]
Dec 12 12:25:24.916 INFO [stderr]    |            ^^^^^^^^^^^^^^^^^^^^
Dec 12 12:25:24.920 INFO [stderr]    |
Dec 12 12:25:24.920 INFO [stderr] note: subsumed by `#[panic_handler]`
Dec 12 12:25:24.920 INFO [stderr]   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:22:12
Dec 12 12:25:24.920 INFO [stderr]    |
Dec 12 12:25:24.920 INFO [stderr] 22 | #![feature(panic_implementation)]
Dec 12 12:25:24.920 INFO [stderr]    |            ^^^^^^^^^^^^^^^^^^^^
Dec 12 12:25:24.920 INFO [stderr] 
Dec 12 12:25:24.957 INFO [stderr] error[E0658]: The attribute `panic_implementation` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Dec 12 12:25:24.957 INFO [stderr]   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:28:3
Dec 12 12:25:24.957 INFO [stderr]    |
Dec 12 12:25:24.957 INFO [stderr] 28 | #[panic_implementation]
Dec 12 12:25:24.957 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^
Dec 12 12:25:24.957 INFO [stderr]    |
Dec 12 12:25:24.957 INFO [stderr]    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Dec 12 12:25:24.957 INFO [stderr] 
Dec 12 12:25:24.957 INFO [stderr] error: aborting due to 2 previous errors
Dec 12 12:25:24.957 INFO [stderr] 
Dec 12 12:25:24.957 INFO [stderr] Some errors occurred: E0557, E0658.
Dec 12 12:25:24.957 INFO [stderr] For more information about an error, try `rustc --explain E0557`.
Dec 12 12:25:24.957 INFO [stderr] error: Could not compile `panic-abort`.
Dec 12 12:25:24.957 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 12 12:25:41.498 INFO [stderr] error: build failed
Dec 12 12:25:41.499 INFO [stderr] su: No module specific data is present
Dec 12 12:25:41.946 INFO running `"docker" "inspect" "5609901246e5fe232cd9a8d1940cd0d248923b320627ce86c5b793249f18060f"`
Dec 12 12:25:42.105 INFO running `"docker" "rm" "-f" "5609901246e5fe232cd9a8d1940cd0d248923b320627ce86c5b793249f18060f"`
Dec 12 12:25:42.250 INFO [stdout] 5609901246e5fe232cd9a8d1940cd0d248923b320627ce86c5b793249f18060f