[INFO] cloning repository Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7
[INFO] running `"git" "clone" "--bare" "git://github.com/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7.git" "work/cache/sources/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7'...
[INFO] running `"git" "clone" "work/cache/sources/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7" "work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7" "work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2a4c732f3bbc874c29ac9572c40c0972b9395b11
[INFO] sha for GitHub repo Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7: 2a4c732f3bbc874c29ac9572c40c0972b9395b11
[INFO] validating manifest of Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7 on toolchain master#9f06855064ed06a50c496577b21ca50f92a2e67d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7 on toolchain try#d3301713b54af69ca9de941a8c6b0d8287dbd6df
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7
[INFO] finished frobbing Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7
[INFO] frobbed toml for Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7 written to work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7/Cargo.toml
[INFO] started frobbing Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7
[INFO] finished frobbing Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7
[INFO] frobbed toml for Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7 written to work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7/Cargo.toml
[INFO] crate Rust-Mikrocontroller-Praktikum-2018/mp-pong-stm32f7 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-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 link-arg=-Tstm32f7.ld -C linker=arm-none-eabi-ld -Z linker-flavor=ld -Z thinlto=no --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" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed