Dec 13 11:22:21.444 INFO testing mattdeboard/prepend_line against try#aa49d8ef14939ddec0e34b346b60174a5673d48f for pr-56550
Dec 13 11:22:21.444 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-4/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56550/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/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 +aa49d8ef14939ddec0e34b346b60174a5673d48f-alt build --frozen" "-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 13 11:22:21.854 INFO [stdout] 14837c2fa8e76c256b86a0de57f561017807cb6ce2b171333074520515e2a824
Dec 13 11:22:21.854 INFO running `"docker" "start" "-a" "14837c2fa8e76c256b86a0de57f561017807cb6ce2b171333074520515e2a824"`
Dec 13 11:22:22.631 INFO [stderr] usermod: no changes
Dec 13 11:22:22.743 INFO [stderr]    Compiling proc-macro2 v0.4.12
Dec 13 11:22:22.743 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.16
Dec 13 11:22:22.743 INFO [stderr]    Compiling log v0.4.3
Dec 13 11:22:22.743 INFO [stderr]    Compiling uuid v0.1.18
Dec 13 11:22:24.259 INFO [stderr]    Compiling mktemp v0.3.1
Dec 13 11:22:24.431 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 13 11:22:24.431 INFO [stderr]    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Dec 13 11:22:24.431 INFO [stderr]     |
Dec 13 11:22:24.431 INFO [stderr] 346 |             Span::Nightly(proc_macro::Span::def_site())
Dec 13 11:22:24.431 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 11:22:24.431 INFO [stderr]     |
Dec 13 11:22:24.431 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 13 11:22:24.431 INFO [stderr] 
Dec 13 11:22:24.451 INFO [stderr] error: aborting due to previous error
Dec 13 11:22:24.451 INFO [stderr] 
Dec 13 11:22:24.451 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 13 11:22:24.456 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 13 11:22:24.456 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 13 11:22:24.763 INFO [stderr] error: build failed
Dec 13 11:22:24.763 INFO [stderr] su: No module specific data is present
Dec 13 11:22:25.271 INFO running `"docker" "inspect" "14837c2fa8e76c256b86a0de57f561017807cb6ce2b171333074520515e2a824"`
Dec 13 11:22:25.577 INFO running `"docker" "rm" "-f" "14837c2fa8e76c256b86a0de57f561017807cb6ce2b171333074520515e2a824"`
Dec 13 11:22:26.089 INFO [stdout] 14837c2fa8e76c256b86a0de57f561017807cb6ce2b171333074520515e2a824