Dec 05 11:20:59.358 INFO checking keymatrix-0.1.2 against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 11:20:59.359 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-6/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/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 +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-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 05 11:20:59.681 INFO [stdout] d0df245743812522168720673a8473ad870ec617ec9cddf5256c1a8d08dd9dc9
Dec 05 11:20:59.689 INFO running `"docker" "start" "-a" "d0df245743812522168720673a8473ad870ec617ec9cddf5256c1a8d08dd9dc9"`
Dec 05 11:21:00.783 INFO [stderr] usermod: no changes
Dec 05 11:21:00.962 INFO [stderr]    Compiling atsamd21g18a v0.3.1
Dec 05 11:21:00.964 INFO [stderr]    Compiling cortex-m v0.3.1
Dec 05 11:21:00.967 INFO [stderr]     Checking bitfield v0.13.1
Dec 05 11:21:00.967 INFO [stderr]    Compiling cortex-m-rtfm v0.3.4
Dec 05 11:21:00.967 INFO [stderr]     Checking rtfm-core v0.2.0
Dec 05 11:21:00.967 INFO [stderr]     Checking panic-abort v0.2.0
Dec 05 11:21:00.979 INFO [stderr]    Compiling mashup-impl v0.1.9
Dec 05 11:21:00.979 INFO [stderr]    Compiling syn v0.14.9
Dec 05 11:21:01.067 INFO [stderr]    Compiling synstructure v0.10.1
Dec 05 11:21:01.095 INFO [stderr] error[E0557]: feature has been removed
Dec 05 11:21:01.095 INFO [stderr]   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:22:12
Dec 05 11:21:01.095 INFO [stderr]    |
Dec 05 11:21:01.095 INFO [stderr] 22 | #![feature(panic_implementation)]
Dec 05 11:21:01.095 INFO [stderr]    |            ^^^^^^^^^^^^^^^^^^^^
Dec 05 11:21:01.095 INFO [stderr]    |
Dec 05 11:21:01.095 INFO [stderr] note: subsumed by `#[panic_handler]`
Dec 05 11:21:01.095 INFO [stderr]   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:22:12
Dec 05 11:21:01.095 INFO [stderr]    |
Dec 05 11:21:01.095 INFO [stderr] 22 | #![feature(panic_implementation)]
Dec 05 11:21:01.095 INFO [stderr]    |            ^^^^^^^^^^^^^^^^^^^^
Dec 05 11:21:01.095 INFO [stderr] 
Dec 05 11:21:01.138 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 05 11:21:01.138 INFO [stderr]   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:28:3
Dec 05 11:21:01.138 INFO [stderr]    |
Dec 05 11:21:01.138 INFO [stderr] 28 | #[panic_implementation]
Dec 05 11:21:01.138 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^
Dec 05 11:21:01.140 INFO [stderr]    |
Dec 05 11:21:01.140 INFO [stderr]    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Dec 05 11:21:01.140 INFO [stderr] 
Dec 05 11:21:01.141 INFO [stderr] error: aborting due to 2 previous errors
Dec 05 11:21:01.141 INFO [stderr] 
Dec 05 11:21:01.141 INFO [stderr] Some errors occurred: E0557, E0658.
Dec 05 11:21:01.141 INFO [stderr] For more information about an error, try `rustc --explain E0557`.
Dec 05 11:21:01.154 INFO [stderr] error: Could not compile `panic-abort`.
Dec 05 11:21:01.154 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 05 11:21:19.093 INFO [stderr] error: build failed
Dec 05 11:21:19.094 INFO [stderr] su: No module specific data is present
Dec 05 11:21:19.555 INFO running `"docker" "inspect" "d0df245743812522168720673a8473ad870ec617ec9cddf5256c1a8d08dd9dc9"`
Dec 05 11:21:19.895 INFO running `"docker" "rm" "-f" "d0df245743812522168720673a8473ad870ec617ec9cddf5256c1a8d08dd9dc9"`
Dec 05 11:21:20.273 INFO [stdout] d0df245743812522168720673a8473ad870ec617ec9cddf5256c1a8d08dd9dc9