Dec 18 13:50:40.867 INFO checking mscorlib_safe_derive-0.1.3 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 13:50:40.867 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/mscorlib_safe_derive/0.1.3:/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 13:50:41.156 INFO [stdout] 864d8075e589733bcaa643a439c50d8b83df1436b809a6c5a0daad25b4d8b5a5
Dec 18 13:50:41.160 INFO running `"docker" "start" "-a" "864d8075e589733bcaa643a439c50d8b83df1436b809a6c5a0daad25b4d8b5a5"`
Dec 18 13:50:42.412 INFO [stderr]    Compiling proc-macro2 v0.4.24
Dec 18 13:50:44.330 INFO [stderr]     Checking quote v0.6.10
Dec 18 13:50:44.710 INFO [stderr]     Checking syn v0.14.9
Dec 18 13:50:47.553 INFO [stderr]     Checking mscorlib_safe_derive v0.1.3 (/opt/crater/workdir)
Dec 18 13:50:48.032 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.69s
Dec 18 13:50:48.442 INFO running `"docker" "inspect" "864d8075e589733bcaa643a439c50d8b83df1436b809a6c5a0daad25b4d8b5a5"`
Dec 18 13:50:48.518 INFO running `"docker" "rm" "-f" "864d8075e589733bcaa643a439c50d8b83df1436b809a6c5a0daad25b4d8b5a5"`
Dec 18 13:50:48.590 INFO [stdout] 864d8075e589733bcaa643a439c50d8b83df1436b809a6c5a0daad25b4d8b5a5