Nov 02 10:37:26.703 INFO checking mattdeboard/prepend_line against try#dc8b02d6f1e93f212fc39844ea688b634b4a03c7 for pr-55517
Nov 02 10:37:26.704 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55517/worker-0/try#dc8b02d6f1e93f212fc39844ea688b634b4a03c7:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/pr-55517/try#dc8b02d6f1e93f212fc39844ea688b634b4a03c7:/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 +dc8b02d6f1e93f212fc39844ea688b634b4a03c7-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 02 10:37:27.152 INFO blam! cde8c9b59753b8fa244864cd705f3e38a7cb72df79f97ec23702b57a992df724
Nov 02 10:37:27.155 INFO running `"docker" "start" "-a" "cde8c9b59753b8fa244864cd705f3e38a7cb72df79f97ec23702b57a992df724"`
Nov 02 10:37:28.445 INFO kablam! usermod: no changes
Nov 02 10:37:28.639 INFO kablam!    Compiling proc-macro2 v0.4.12
Nov 02 10:37:28.648 INFO kablam!    Compiling wasm-bindgen-shared v0.2.16
Nov 02 10:37:28.668 INFO kablam!    Compiling log v0.4.3
Nov 02 10:37:28.668 INFO kablam!    Compiling ryu v0.2.3
Nov 02 10:37:28.668 INFO kablam!     Checking uuid v0.1.18
Nov 02 10:37:30.776 INFO kablam!    Compiling serde_json v1.0.26
Nov 02 10:37:31.768 INFO kablam!     Checking mktemp v0.3.1
Nov 02 10:37:35.483 INFO kablam! error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Nov 02 10:37:35.484 INFO kablam!    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Nov 02 10:37:35.484 INFO kablam!     |
Nov 02 10:37:35.485 INFO kablam! 346 |             Span::Nightly(proc_macro::Span::def_site())
Nov 02 10:37:35.486 INFO kablam!     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 02 10:37:35.486 INFO kablam!     |
Nov 02 10:37:35.487 INFO kablam!     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Nov 02 10:37:35.487 INFO kablam! 
Nov 02 10:37:35.532 INFO kablam! error: aborting due to previous error
Nov 02 10:37:35.533 INFO kablam! 
Nov 02 10:37:35.534 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Nov 02 10:37:35.549 INFO kablam! error: Could not compile `proc-macro2`.
Nov 02 10:37:35.550 INFO kablam! warning: build failed, waiting for other jobs to finish...
Nov 02 10:37:38.097 INFO kablam! error: build failed
Nov 02 10:37:38.099 INFO kablam! su: No module specific data is present
Nov 02 10:37:39.384 INFO running `"docker" "rm" "-f" "cde8c9b59753b8fa244864cd705f3e38a7cb72df79f97ec23702b57a992df724"`
Nov 02 10:37:39.748 INFO blam! cde8c9b59753b8fa244864cd705f3e38a7cb72df79f97ec23702b57a992df724