Dec 17 19:59:32.900 INFO checking mattdeboard/prepend_line against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 19:59:32.900 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/mattdeboard/prepend_line:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 19:59:33.256 INFO [stdout] c7b6099526d9890850499f01c0ef19511b86f07edf55f810fe77c655ed2fdfa0
Dec 17 19:59:33.258 INFO running `"docker" "start" "-a" "c7b6099526d9890850499f01c0ef19511b86f07edf55f810fe77c655ed2fdfa0"`
Dec 17 19:59:34.532 INFO [stderr]    Compiling proc-macro2 v0.4.12
Dec 17 19:59:34.532 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.16
Dec 17 19:59:34.532 INFO [stderr]    Compiling itoa v0.4.2
Dec 17 19:59:34.540 INFO [stderr]    Compiling log v0.4.3
Dec 17 19:59:34.540 INFO [stderr]    Compiling serde v1.0.71
Dec 17 19:59:34.540 INFO [stderr]    Compiling ryu v0.2.3
Dec 17 19:59:34.540 INFO [stderr]     Checking uuid v0.1.18
Dec 17 19:59:35.709 INFO [stderr]     Checking mktemp v0.3.1
Dec 17 19:59:36.572 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 17 19:59:36.573 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Dec 17 19:59:36.573 INFO [stderr]     |
Dec 17 19:59:36.573 INFO [stderr] 346 |             Span::Nightly(proc_macro::Span::def_site())
Dec 17 19:59:36.574 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 19:59:36.574 INFO [stderr]     |
Dec 17 19:59:36.574 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 17 19:59:36.575 INFO [stderr] 
Dec 17 19:59:36.586 INFO [stderr] error: aborting due to previous error
Dec 17 19:59:36.586 INFO [stderr] 
Dec 17 19:59:36.586 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 17 19:59:36.596 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 17 19:59:36.596 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 17 19:59:45.936 INFO [stderr] error: build failed
Dec 17 19:59:46.913 INFO running `"docker" "inspect" "c7b6099526d9890850499f01c0ef19511b86f07edf55f810fe77c655ed2fdfa0"`
Dec 17 19:59:47.258 INFO running `"docker" "rm" "-f" "c7b6099526d9890850499f01c0ef19511b86f07edf55f810fe77c655ed2fdfa0"`
Dec 17 19:59:47.507 INFO [stdout] c7b6099526d9890850499f01c0ef19511b86f07edf55f810fe77c655ed2fdfa0