Oct 12 17:44:57.951 INFO checking mattdeboard/prepend_line against master#5af0bb83044c3fb43d59ad5f49ee5ae1a293901f for pr-54977
Oct 12 17:44:57.951 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-0/master#5af0bb83044c3fb43d59ad5f49ee5ae1a293901f:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-0/pr-54977/master#5af0bb83044c3fb43d59ad5f49ee5ae1a293901f:/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 +5af0bb83044c3fb43d59ad5f49ee5ae1a293901f-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"`
Oct 12 17:44:58.331 INFO blam! b86c3d23e33df560a33e93c04c9b258f4fd5224735c5a2dfe3719559511447e1
Oct 12 17:44:58.332 INFO running `"docker" "start" "-a" "b86c3d23e33df560a33e93c04c9b258f4fd5224735c5a2dfe3719559511447e1"`
Oct 12 17:44:59.808 INFO kablam! usermod: no changes
Oct 12 17:45:00.035 INFO kablam!    Compiling proc-macro2 v0.4.12
Oct 12 17:45:00.035 INFO kablam!    Compiling serde_json v1.0.26
Oct 12 17:45:00.035 INFO kablam!     Checking uuid v0.1.18
Oct 12 17:45:01.806 INFO kablam!     Checking mktemp v0.3.1
Oct 12 17:45:03.556 INFO kablam! error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Oct 12 17:45:03.556 INFO kablam!    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Oct 12 17:45:03.556 INFO kablam!     |
Oct 12 17:45:03.556 INFO kablam! 346 |             Span::Nightly(proc_macro::Span::def_site())
Oct 12 17:45:03.556 INFO kablam!     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 12 17:45:03.556 INFO kablam!     |
Oct 12 17:45:03.556 INFO kablam!     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Oct 12 17:45:03.556 INFO kablam! 
Oct 12 17:45:03.584 INFO kablam! error: aborting due to previous error
Oct 12 17:45:03.584 INFO kablam! 
Oct 12 17:45:03.584 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Oct 12 17:45:03.591 INFO kablam! error: Could not compile `proc-macro2`.
Oct 12 17:45:03.591 INFO kablam! warning: build failed, waiting for other jobs to finish...
Oct 12 17:45:05.804 INFO kablam! error: build failed
Oct 12 17:45:05.806 INFO kablam! su: No module specific data is present
Oct 12 17:45:06.805 INFO running `"docker" "rm" "-f" "b86c3d23e33df560a33e93c04c9b258f4fd5224735c5a2dfe3719559511447e1"`
Oct 12 17:45:07.109 INFO blam! b86c3d23e33df560a33e93c04c9b258f4fd5224735c5a2dfe3719559511447e1