Dec 17 19:59:33.708 INFO checking mattdeboard/prepend_line against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 19:59:33.708 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-7/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 19:59:33.986 INFO [stdout] 130bd397f5956df402642f92c87714bd763e3eff076a069d812f3ef9c63ddaeb
Dec 17 19:59:33.988 INFO running `"docker" "start" "-a" "130bd397f5956df402642f92c87714bd763e3eff076a069d812f3ef9c63ddaeb"`
Dec 17 19:59:35.482 INFO [stderr]    Compiling proc-macro2 v0.4.12
Dec 17 19:59:35.482 INFO [stderr]    Compiling serde_json v1.0.26
Dec 17 19:59:35.482 INFO [stderr]     Checking uuid v0.1.18
Dec 17 19:59:36.388 INFO [stderr]     Checking mktemp v0.3.1
Dec 17 19:59:36.431 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 17 19:59:36.431 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Dec 17 19:59:36.431 INFO [stderr]     |
Dec 17 19:59:36.431 INFO [stderr] 346 |             Span::Nightly(proc_macro::Span::def_site())
Dec 17 19:59:36.431 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 19:59:36.431 INFO [stderr]     |
Dec 17 19:59:36.431 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 17 19:59:36.431 INFO [stderr] 
Dec 17 19:59:36.449 INFO [stderr] error: aborting due to previous error
Dec 17 19:59:36.449 INFO [stderr] 
Dec 17 19:59:36.449 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 17 19:59:36.476 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 17 19:59:36.477 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 17 19:59:38.664 INFO [stderr] error: build failed
Dec 17 19:59:39.146 INFO running `"docker" "inspect" "130bd397f5956df402642f92c87714bd763e3eff076a069d812f3ef9c63ddaeb"`
Dec 17 19:59:39.386 INFO running `"docker" "rm" "-f" "130bd397f5956df402642f92c87714bd763e3eff076a069d812f3ef9c63ddaeb"`
Dec 17 19:59:39.676 INFO [stdout] 130bd397f5956df402642f92c87714bd763e3eff076a069d812f3ef9c63ddaeb