Dec 05 15:08:25.759 INFO testing mattdeboard/prepend_line against master#906deae0790bd18681b937fe9a141a3c26cf1855 for pr-56514
Dec 05 15:08:25.759 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-2/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-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 05 15:08:25.919 INFO [stdout] c72910d75e00e51cc7a2123161809ef769889a5d54435b8d4202caf528a97041
Dec 05 15:08:25.920 INFO running `"docker" "start" "-a" "c72910d75e00e51cc7a2123161809ef769889a5d54435b8d4202caf528a97041"`
Dec 05 15:08:26.468 INFO [stderr] usermod: no changes
Dec 05 15:08:26.628 INFO [stderr]    Compiling proc-macro2 v0.4.12
Dec 05 15:08:26.630 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.16
Dec 05 15:08:26.631 INFO [stderr]    Compiling log v0.4.3
Dec 05 15:08:26.632 INFO [stderr]    Compiling uuid v0.1.18
Dec 05 15:08:28.152 INFO [stderr]    Compiling mktemp v0.3.1
Dec 05 15:08:28.233 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 05 15:08:28.233 INFO [stderr]    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Dec 05 15:08:28.233 INFO [stderr]     |
Dec 05 15:08:28.233 INFO [stderr] 346 |             Span::Nightly(proc_macro::Span::def_site())
Dec 05 15:08:28.233 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 15:08:28.233 INFO [stderr]     |
Dec 05 15:08:28.233 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 05 15:08:28.233 INFO [stderr] 
Dec 05 15:08:28.249 INFO [stderr] error: aborting due to previous error
Dec 05 15:08:28.249 INFO [stderr] 
Dec 05 15:08:28.249 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 05 15:08:28.256 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 05 15:08:28.256 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 05 15:08:28.688 INFO [stderr] error: build failed
Dec 05 15:08:28.690 INFO [stderr] su: No module specific data is present
Dec 05 15:08:29.087 INFO running `"docker" "inspect" "c72910d75e00e51cc7a2123161809ef769889a5d54435b8d4202caf528a97041"`
Dec 05 15:08:29.364 INFO running `"docker" "rm" "-f" "c72910d75e00e51cc7a2123161809ef769889a5d54435b8d4202caf528a97041"`
Dec 05 15:08:29.596 INFO [stdout] c72910d75e00e51cc7a2123161809ef769889a5d54435b8d4202caf528a97041