Dec 18 10:44:51.668 INFO checking stm32f4xx-hal-0.2.6 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 10:44:51.669 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/reg/stm32f4xx-hal/0.2.6:/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 10:44:53.464 INFO [stdout] 3b1f8246a6badf1294a57fd62cd84d09e6a2220fffcf6ac72851dc33f188fec3
Dec 18 10:44:53.467 INFO running `"docker" "start" "-a" "3b1f8246a6badf1294a57fd62cd84d09e6a2220fffcf6ac72851dc33f188fec3"`
Dec 18 10:44:54.103 INFO [stderr]    Compiling semver-parser v0.7.0
Dec 18 10:44:54.104 INFO [stderr]    Compiling proc-macro2 v0.4.24
Dec 18 10:44:54.104 INFO [stderr]    Compiling unicode-xid v0.1.0
Dec 18 10:44:54.108 INFO [stderr]    Compiling rand_core v0.3.0
Dec 18 10:44:54.108 INFO [stderr]    Compiling cortex-m v0.5.8
Dec 18 10:44:54.108 INFO [stderr]     Checking vcell v0.1.0
Dec 18 10:44:54.108 INFO [stderr]    Compiling cortex-m-rt v0.6.7
Dec 18 10:44:54.108 INFO [stderr]    Compiling stm32f4 v0.4.0
Dec 18 10:44:54.532 INFO [stderr] error[E0463]: can't find crate for `core`
Dec 18 10:44:54.540 INFO [stderr]   |
Dec 18 10:44:54.540 INFO [stderr]   = note: the `thumbv7em-none-eabihf` target may not be installed
Dec 18 10:44:54.540 INFO [stderr] 
Dec 18 10:44:54.540 INFO [stderr] error: aborting due to previous error
Dec 18 10:44:54.540 INFO [stderr] 
Dec 18 10:44:54.540 INFO [stderr] For more information about this error, try `rustc --explain E0463`.
Dec 18 10:44:54.555 INFO [stderr] error: Could not compile `vcell`.
Dec 18 10:44:54.555 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 10:44:55.935 INFO [stderr] error: build failed
Dec 18 10:44:56.430 INFO running `"docker" "inspect" "3b1f8246a6badf1294a57fd62cd84d09e6a2220fffcf6ac72851dc33f188fec3"`
Dec 18 10:44:56.639 INFO running `"docker" "rm" "-f" "3b1f8246a6badf1294a57fd62cd84d09e6a2220fffcf6ac72851dc33f188fec3"`
Dec 18 10:44:56.808 INFO [stdout] 3b1f8246a6badf1294a57fd62cd84d09e6a2220fffcf6ac72851dc33f188fec3