Dec 19 19:31:42.405 INFO checking brson/httptest against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 19:31:42.405 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-2/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/brson/httptest:/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 19:31:42.870 INFO [stdout] c92c4bfe914e37d93be376023bbc0e51d91c028631b1414e8c9bbc3a9d3d2a35
Dec 19 19:31:42.872 INFO running `"docker" "start" "-a" "c92c4bfe914e37d93be376023bbc0e51d91c028631b1414e8c9bbc3a9d3d2a35"`
Dec 19 19:31:45.124 INFO [stderr]     Checking hyper v0.10.5
Dec 19 19:31:48.788 INFO [stderr]     Checking iron v0.5.1
Dec 19 19:31:49.555 INFO [stderr]     Checking router v0.5.1
Dec 19 19:31:50.385 INFO [stderr]     Checking httptest v0.2.0 (/opt/crater/workdir)
Dec 19 19:31:52.385 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.39s
Dec 19 19:31:53.415 INFO running `"docker" "inspect" "c92c4bfe914e37d93be376023bbc0e51d91c028631b1414e8c9bbc3a9d3d2a35"`
Dec 19 19:31:53.827 INFO running `"docker" "rm" "-f" "c92c4bfe914e37d93be376023bbc0e51d91c028631b1414e8c9bbc3a9d3d2a35"`
Dec 19 19:31:54.188 INFO [stdout] c92c4bfe914e37d93be376023bbc0e51d91c028631b1414e8c9bbc3a9d3d2a35