Dec 01 11:37:17.665 INFO documenting mattdeboard/prepend_line against try#f86f76f89ea2b1ccbfb3741962ec2029d878a389 for pr-55318-1
Dec 01 11:37:17.665 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55318-1/worker-3/try#f86f76f89ea2b1ccbfb3741962ec2029d878a389:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-55318-1/try#f86f76f89ea2b1ccbfb3741962ec2029d878a389:/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 +f86f76f89ea2b1ccbfb3741962ec2029d878a389-alt doc --frozen --no-deps --document-private-items" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 01 11:37:18.128 INFO [stdout] 9544afd8dca3d21ed0120e76b0d7ac31bbf70e15422f0a141b9e17e5efe23774
Dec 01 11:37:18.160 INFO running `"docker" "start" "-a" "9544afd8dca3d21ed0120e76b0d7ac31bbf70e15422f0a141b9e17e5efe23774"`
Dec 01 11:37:19.349 INFO [stderr] usermod: no changes
Dec 01 11:37:19.632 INFO [stderr]    Compiling proc-macro2 v0.4.12
Dec 01 11:37:19.632 INFO [stderr]    Compiling ryu v0.2.3
Dec 01 11:37:19.632 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.16
Dec 01 11:37:19.648 INFO [stderr]    Compiling log v0.4.3
Dec 01 11:37:19.648 INFO [stderr]    Compiling serde v1.0.71
Dec 01 11:37:19.648 INFO [stderr]     Checking uuid v0.1.18
Dec 01 11:37:22.220 INFO [stderr]     Checking mktemp v0.3.1
Dec 01 11:37:25.680 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 01 11:37:25.680 INFO [stderr]    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
Dec 01 11:37:25.680 INFO [stderr]     |
Dec 01 11:37:25.680 INFO [stderr] 346 |             Span::Nightly(proc_macro::Span::def_site())
Dec 01 11:37:25.680 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 11:37:25.680 INFO [stderr]     |
Dec 01 11:37:25.680 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 01 11:37:25.680 INFO [stderr] 
Dec 01 11:37:25.752 INFO [stderr] error: aborting due to previous error
Dec 01 11:37:25.752 INFO [stderr] 
Dec 01 11:37:25.752 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 01 11:37:25.782 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 01 11:37:25.782 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 01 11:37:34.603 INFO [stderr] error: build failed
Dec 01 11:37:34.603 INFO [stderr] su: No module specific data is present
Dec 01 11:37:36.032 INFO running `"docker" "inspect" "9544afd8dca3d21ed0120e76b0d7ac31bbf70e15422f0a141b9e17e5efe23774"`
Dec 01 11:37:36.254 INFO running `"docker" "rm" "-f" "9544afd8dca3d21ed0120e76b0d7ac31bbf70e15422f0a141b9e17e5efe23774"`
Dec 01 11:37:36.597 INFO [stdout] 9544afd8dca3d21ed0120e76b0d7ac31bbf70e15422f0a141b9e17e5efe23774