[INFO] updating cached repository shima-529/STM32OnRust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/shima-529/STM32OnRust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/shima-529/STM32OnRust" "work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/gh/shima-529/STM32OnRust"`
[INFO] [stderr] Cloning into 'work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/gh/shima-529/STM32OnRust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/shima-529/STM32OnRust" "work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/gh/shima-529/STM32OnRust"`
[INFO] [stderr] Cloning into 'work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/gh/shima-529/STM32OnRust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f4ca4568daa4bf942b86b5e56fb6f0fff7a3d64a
[INFO] sha for GitHub repo shima-529/STM32OnRust: f4ca4568daa4bf942b86b5e56fb6f0fff7a3d64a
[INFO] validating manifest of shima-529/STM32OnRust on toolchain master#e2f221c75932de7a29845c8d6f1f73536ad00c41
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e2f221c75932de7a29845c8d6f1f73536ad00c41-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of shima-529/STM32OnRust on toolchain try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0bfb90d213a93e466b33d078a5b535a2a6f9c5ff-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing shima-529/STM32OnRust
[INFO] finished frobbing shima-529/STM32OnRust
[INFO] frobbed toml for shima-529/STM32OnRust written to work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/gh/shima-529/STM32OnRust/Cargo.toml
[INFO] started frobbing shima-529/STM32OnRust
[INFO] finished frobbing shima-529/STM32OnRust
[INFO] frobbed toml for shima-529/STM32OnRust written to work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/gh/shima-529/STM32OnRust/Cargo.toml
[INFO] crate shima-529/STM32OnRust has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e2f221c75932de7a29845c8d6f1f73536ad00c41-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: failed to run `rustc` to learn about target-specific information
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc - --crate-name ___ --print=file-names -C linker=arm-none-eabi-gcc -Z linker-flavor=gcc -Z no-landing-pads -C opt-level=2 -C link-arg=-mcpu=cortex-m4 -C link-arg=-mthumb -C link-arg=-mfloat-abi=hard -C link-arg=-mfpu=fpv4-sp-d16 -C link-arg=-specs=nosys.specs -C link-arg=-specs=nano.specs -C link-arg=-Wl,-T,src/layout.ld -C link-arg=-Wl,--gc-sections --target thumbv7em-none-eabihf --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro` (exit code: 1)
[INFO] [stderr] --- stderr
[INFO] [stderr] error: unknown debugging option: `linker-flavor`
[INFO] [stderr] 
[INFO] [stderr] 
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e2f221c75932de7a29845c8d6f1f73536ad00c41-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed