Dec 19 19:16:12.114 INFO checking cave-dev/dummy-backend-api against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 19:16:12.114 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/cave-dev/dummy-backend-api:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 19:16:12.598 INFO [stdout] 7b61bc9612fc8aa633eaefb41c50afa487a1917e046d54235cd671c4a6a4930d
Dec 19 19:16:12.602 INFO running `"docker" "start" "-a" "7b61bc9612fc8aa633eaefb41c50afa487a1917e046d54235cd671c4a6a4930d"`
Dec 19 19:16:15.561 INFO [stderr]    Compiling pear_codegen v0.0.20
Dec 19 19:16:15.568 INFO [stderr]    Compiling toml v0.4.8
Dec 19 19:16:15.576 INFO [stderr]     Checking unicase_serde v0.1.0
Dec 19 19:16:15.576 INFO [stderr]    Compiling syn v0.15.11
Dec 19 19:16:15.577 INFO [stderr]     Checking url_serde v0.2.0
Dec 19 19:16:15.608 INFO [stderr]    Compiling ring v0.11.0
Dec 19 19:16:22.832 INFO [stderr] error[E0599]: no variant named `concat` found for type `syntax::tokenstream::TokenStream` in the current scope
Dec 19 19:16:22.832 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/pear_codegen-0.0.20/src/lib.rs:330:54
Dec 19 19:16:22.832 INFO [stderr]     |
Dec 19 19:16:22.832 INFO [stderr] 330 |                 mac.node.tts = ThinTokenStream::from(TokenStream::concat(streams));
Dec 19 19:16:22.832 INFO [stderr]     |                                                      ^^^^^^^^^^^^^^^^^^^ variant not found in `syntax::tokenstream::TokenStream`
Dec 19 19:16:22.832 INFO [stderr] 
Dec 19 19:16:23.220 INFO [stderr] error: aborting due to previous error
Dec 19 19:16:23.220 INFO [stderr] 
Dec 19 19:16:23.220 INFO [stderr] For more information about this error, try `rustc --explain E0599`.
Dec 19 19:16:23.280 INFO [stderr] error: Could not compile `pear_codegen`.
Dec 19 19:16:23.280 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 19 19:16:34.458 INFO [stderr] error: build failed
Dec 19 19:16:35.970 INFO running `"docker" "inspect" "7b61bc9612fc8aa633eaefb41c50afa487a1917e046d54235cd671c4a6a4930d"`
Dec 19 19:16:36.262 INFO running `"docker" "rm" "-f" "7b61bc9612fc8aa633eaefb41c50afa487a1917e046d54235cd671c4a6a4930d"`
Dec 19 19:16:36.692 INFO [stdout] 7b61bc9612fc8aa633eaefb41c50afa487a1917e046d54235cd671c4a6a4930d