Dec 04 14:27:52.656 INFO checking mattdeboard/prepend_line against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 04 14:27:52.656 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-5/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/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 04 14:27:52.936 INFO [stdout] f74137c02673e05fbadf40b940bbae6db71ef42485c3ecb6ecbb28add4631b1e
Dec 04 14:27:52.943 INFO running `"docker" "start" "-a" "f74137c02673e05fbadf40b940bbae6db71ef42485c3ecb6ecbb28add4631b1e"`
Dec 04 14:27:54.059 INFO [stderr] usermod: no changes
Dec 04 14:27:54.223 INFO [stderr]    Compiling proc-macro2 v0.4.12
Dec 04 14:27:54.223 INFO [stderr]    Compiling ryu v0.2.3
Dec 04 14:27:54.223 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.16
Dec 04 14:27:54.239 INFO [stderr]    Compiling log v0.4.3
Dec 04 14:27:54.239 INFO [stderr]     Checking uuid v0.1.18
Dec 04 14:27:56.543 INFO [stderr]     Checking mktemp v0.3.1
Dec 04 14:27:57.624 INFO [stderr]    Compiling serde_json v1.0.26
Dec 04 14:27:57.851 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 04 14:27:57.851 INFO [stderr]    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Dec 04 14:27:57.851 INFO [stderr]     |
Dec 04 14:27:57.851 INFO [stderr] 346 |             Span::Nightly(proc_macro::Span::def_site())
Dec 04 14:27:57.851 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 04 14:27:57.851 INFO [stderr]     |
Dec 04 14:27:57.851 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 04 14:27:57.851 INFO [stderr] 
Dec 04 14:27:57.871 INFO [stderr] error: aborting due to previous error
Dec 04 14:27:57.871 INFO [stderr] 
Dec 04 14:27:57.871 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 04 14:27:57.894 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 04 14:27:57.895 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 04 14:28:01.911 INFO [stderr] error: build failed
Dec 04 14:28:01.919 INFO [stderr] su: No module specific data is present
Dec 04 14:28:03.067 INFO running `"docker" "inspect" "f74137c02673e05fbadf40b940bbae6db71ef42485c3ecb6ecbb28add4631b1e"`
Dec 04 14:28:03.313 INFO running `"docker" "rm" "-f" "f74137c02673e05fbadf40b940bbae6db71ef42485c3ecb6ecbb28add4631b1e"`
Dec 04 14:28:03.683 INFO [stdout] f74137c02673e05fbadf40b940bbae6db71ef42485c3ecb6ecbb28add4631b1e