Nov 29 22:40:46.369 INFO checking mattdeboard/prepend_line against master#a49316ddc99d9d595193557fc899f6c52e4d9af9 for pr-56323
Nov 29 22:40:46.369 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56323/worker-1/master#a49316ddc99d9d595193557fc899f6c52e4d9af9:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56323/master#a49316ddc99d9d595193557fc899f6c52e4d9af9:/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 +a49316ddc99d9d595193557fc899f6c52e4d9af9-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 29 22:40:46.771 INFO [stdout] 4a6985517f8a3833e97f058297c7bc5da8e4fa6dcfdcbad476140b1ce94f00bf
Nov 29 22:40:46.778 INFO running `"docker" "start" "-a" "4a6985517f8a3833e97f058297c7bc5da8e4fa6dcfdcbad476140b1ce94f00bf"`
Nov 29 22:40:48.473 INFO [stderr] usermod: no changes
Nov 29 22:40:48.656 INFO [stderr]    Compiling proc-macro2 v0.4.12
Nov 29 22:40:48.656 INFO [stderr]    Compiling ryu v0.2.3
Nov 29 22:40:48.656 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.16
Nov 29 22:40:48.672 INFO [stderr]    Compiling log v0.4.3
Nov 29 22:40:48.672 INFO [stderr]    Compiling lazy_static v1.1.0
Nov 29 22:40:48.672 INFO [stderr]     Checking uuid v0.1.18
Nov 29 22:40:51.436 INFO [stderr]     Checking mktemp v0.3.1
Nov 29 22:40:53.489 INFO [stderr]    Compiling serde_json v1.0.26
Nov 29 22:40:55.358 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Nov 29 22:40:55.358 INFO [stderr]    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Nov 29 22:40:55.358 INFO [stderr]     |
Nov 29 22:40:55.358 INFO [stderr] 346 |             Span::Nightly(proc_macro::Span::def_site())
Nov 29 22:40:55.358 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 29 22:40:55.358 INFO [stderr]     |
Nov 29 22:40:55.358 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Nov 29 22:40:55.358 INFO [stderr] 
Nov 29 22:40:55.391 INFO [stderr] error: aborting due to previous error
Nov 29 22:40:55.392 INFO [stderr] 
Nov 29 22:40:55.392 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Nov 29 22:40:55.405 INFO [stderr] error: Could not compile `proc-macro2`.
Nov 29 22:40:55.406 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Nov 29 22:40:58.281 INFO [stderr] error: build failed
Nov 29 22:40:58.283 INFO [stderr] su: No module specific data is present
Nov 29 22:40:59.284 INFO running `"docker" "inspect" "4a6985517f8a3833e97f058297c7bc5da8e4fa6dcfdcbad476140b1ce94f00bf"`
Nov 29 22:40:59.614 INFO running `"docker" "rm" "-f" "4a6985517f8a3833e97f058297c7bc5da8e4fa6dcfdcbad476140b1ce94f00bf"`
Nov 29 22:40:59.926 INFO [stdout] 4a6985517f8a3833e97f058297c7bc5da8e4fa6dcfdcbad476140b1ce94f00bf