Nov 01 01:12:17.377 INFO checking mattdeboard/prepend_line against try#d7816399d50d407bbce1efe9dbadf8faaaf568fc for pr-55538
Nov 01 01:12:17.377 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55538/worker-1/try#d7816399d50d407bbce1efe9dbadf8faaaf568fc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-55538/try#d7816399d50d407bbce1efe9dbadf8faaaf568fc:/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 +d7816399d50d407bbce1efe9dbadf8faaaf568fc-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"`
Nov 01 01:12:17.644 INFO blam! e192356c86d1920c47c535b68004be4afdcd54953c0fe5a19222f848bb23661c
Nov 01 01:12:17.648 INFO running `"docker" "start" "-a" "e192356c86d1920c47c535b68004be4afdcd54953c0fe5a19222f848bb23661c"`
Nov 01 01:12:18.444 INFO kablam! usermod: no changes
Nov 01 01:12:18.608 INFO kablam!    Compiling proc-macro2 v0.4.12
Nov 01 01:12:18.608 INFO kablam!    Compiling serde_json v1.0.26
Nov 01 01:12:18.608 INFO kablam!     Checking uuid v0.1.18
Nov 01 01:12:19.832 INFO kablam!     Checking mktemp v0.3.1
Nov 01 01:12:21.548 INFO kablam! error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Nov 01 01:12:21.548 INFO kablam!    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Nov 01 01:12:21.548 INFO kablam!     |
Nov 01 01:12:21.548 INFO kablam! 346 |             Span::Nightly(proc_macro::Span::def_site())
Nov 01 01:12:21.548 INFO kablam!     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 01 01:12:21.548 INFO kablam!     |
Nov 01 01:12:21.548 INFO kablam!     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Nov 01 01:12:21.548 INFO kablam! 
Nov 01 01:12:21.572 INFO kablam! error: aborting due to previous error
Nov 01 01:12:21.572 INFO kablam! 
Nov 01 01:12:21.572 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Nov 01 01:12:21.584 INFO kablam! error: Could not compile `proc-macro2`.
Nov 01 01:12:21.584 INFO kablam! warning: build failed, waiting for other jobs to finish...
Nov 01 01:12:24.626 INFO kablam! error: build failed
Nov 01 01:12:24.627 INFO kablam! su: No module specific data is present
Nov 01 01:12:25.529 INFO running `"docker" "rm" "-f" "e192356c86d1920c47c535b68004be4afdcd54953c0fe5a19222f848bb23661c"`
Nov 01 01:12:25.931 INFO blam! e192356c86d1920c47c535b68004be4afdcd54953c0fe5a19222f848bb23661c