Dec 18 08:06:51.117 INFO checking ColbyCypherSociety/ChatDemo against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 08:06:51.117 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-5/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/ColbyCypherSociety/ChatDemo:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 08:06:51.460 INFO [stdout] 063ecceb6bf1341a37ab6611abe2d6862141d986795a5edb840209218d7ba443
Dec 18 08:06:51.466 INFO running `"docker" "start" "-a" "063ecceb6bf1341a37ab6611abe2d6862141d986795a5edb840209218d7ba443"`
Dec 18 08:06:52.428 INFO [stderr]    Compiling proc-macro2 v0.4.13
Dec 18 08:06:52.428 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.17
Dec 18 08:06:52.428 INFO [stderr]    Compiling num-bigint v0.2.0
Dec 18 08:06:52.432 INFO [stderr]    Compiling ryu v0.2.4
Dec 18 08:06:52.432 INFO [stderr]     Checking num-iter v0.1.37
Dec 18 08:06:53.576 INFO [stderr]    Compiling serde_json v1.0.26
Dec 18 08:06:54.268 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 18 08:06:54.268 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.13/src/unstable.rs:359:27
Dec 18 08:06:54.268 INFO [stderr]     |
Dec 18 08:06:54.268 INFO [stderr] 359 |             Span::Nightly(proc_macro::Span::def_site())
Dec 18 08:06:54.268 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 08:06:54.268 INFO [stderr]     |
Dec 18 08:06:54.268 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 18 08:06:54.268 INFO [stderr] 
Dec 18 08:06:54.284 INFO [stderr] error: aborting due to previous error
Dec 18 08:06:54.284 INFO [stderr] 
Dec 18 08:06:54.284 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 18 08:06:54.288 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 18 08:06:54.288 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 08:06:57.094 INFO [stderr] error: build failed
Dec 18 08:06:57.350 INFO running `"docker" "inspect" "063ecceb6bf1341a37ab6611abe2d6862141d986795a5edb840209218d7ba443"`
Dec 18 08:06:57.442 INFO running `"docker" "rm" "-f" "063ecceb6bf1341a37ab6611abe2d6862141d986795a5edb840209218d7ba443"`
Dec 18 08:06:57.534 INFO [stdout] 063ecceb6bf1341a37ab6611abe2d6862141d986795a5edb840209218d7ba443