Dec 01 17:00:03.784 INFO documenting dflemstr/semantic-editor against try#f86f76f89ea2b1ccbfb3741962ec2029d878a389 for pr-55318-1
Dec 01 17:00:03.784 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55318-1/worker-0/try#f86f76f89ea2b1ccbfb3741962ec2029d878a389:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/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 17:00:04.049 INFO [stdout] a67b51ce6439923cd863524f733e037a34444e4dfde5b8037ef306bbf71e056e
Dec 01 17:00:04.053 INFO running `"docker" "start" "-a" "a67b51ce6439923cd863524f733e037a34444e4dfde5b8037ef306bbf71e056e"`
Dec 01 17:00:04.700 INFO [stderr] usermod: no changes
Dec 01 17:00:05.188 INFO [stderr]    Compiling termcolor v1.0.1
Dec 01 17:00:05.188 INFO [stderr]    Compiling alloc-no-stdlib v1.3.0
Dec 01 17:00:05.226 INFO [stderr]     Checking slog v2.3.2
Dec 01 17:00:05.226 INFO [stderr]    Compiling bytesize v1.0.0
Dec 01 17:00:05.226 INFO [stderr]    Compiling type-info v0.2.1
Dec 01 17:00:05.226 INFO [stderr]     Checking futures-await-await-macro v0.1.1
Dec 01 17:00:06.132 INFO [stderr]    Compiling iovec v0.1.2
Dec 01 17:00:06.973 INFO [stderr]    Compiling log v0.4.3
Dec 01 17:00:07.040 INFO [stderr]    Compiling humantime v1.1.1
Dec 01 17:00:07.264 INFO [stderr]    Compiling walkdir v2.2.5
Dec 01 17:00:08.476 INFO [stderr]    Compiling proc-macro2 v0.4.13
Dec 01 17:00:08.652 INFO [stderr]    Compiling brotli-decompressor v1.3.1
Dec 01 17:00:08.652 INFO [stderr]    Compiling tempdir v0.3.7
Dec 01 17:00:11.304 INFO [stderr]     Checking mio v0.6.15
Dec 01 17:00:11.312 INFO [stderr]     Checking slog-scope v4.0.1
Dec 01 17:00:11.312 INFO [stderr]     Checking semantic v0.1.0 (/source/semantic)
Dec 01 17:00:11.374 INFO [stderr]    Compiling backtrace-sys v0.1.23
Dec 01 17:00:12.912 INFO [stderr]    Compiling bytes v0.4.9
Dec 01 17:00:13.132 INFO [stderr]    Compiling env_logger v0.5.12
Dec 01 17:00:13.796 INFO [stderr]    Compiling serde_json v1.0.24
Dec 01 17:00:13.912 INFO [stderr]     Checking tokio-io v0.1.7
Dec 01 17:00:16.444 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 01 17:00:16.444 INFO [stderr]    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.13/src/unstable.rs:359:27
Dec 01 17:00:16.444 INFO [stderr]     |
Dec 01 17:00:16.444 INFO [stderr] 359 |             Span::Nightly(proc_macro::Span::def_site())
Dec 01 17:00:16.444 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 17:00:16.444 INFO [stderr]     |
Dec 01 17:00:16.444 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 01 17:00:16.444 INFO [stderr] 
Dec 01 17:00:16.497 INFO [stderr] error: aborting due to previous error
Dec 01 17:00:16.497 INFO [stderr] 
Dec 01 17:00:16.497 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 01 17:00:16.520 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 01 17:00:16.520 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 01 17:00:22.345 INFO [stderr] error: build failed
Dec 01 17:00:22.345 INFO [stderr] su: No module specific data is present
Dec 01 17:00:23.080 INFO running `"docker" "inspect" "a67b51ce6439923cd863524f733e037a34444e4dfde5b8037ef306bbf71e056e"`
Dec 01 17:00:23.420 INFO running `"docker" "rm" "-f" "a67b51ce6439923cd863524f733e037a34444e4dfde5b8037ef306bbf71e056e"`
Dec 01 17:00:23.618 INFO [stdout] a67b51ce6439923cd863524f733e037a34444e4dfde5b8037ef306bbf71e056e