[INFO] updating cached repository https://github.com/techhazard/teensy-firmware
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cbde05e4efa1fc38b5cd2241615b622d400417e9
[INFO] testing techhazard/teensy-firmware against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftechhazard%2Fteensy-firmware" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/techhazard/teensy-firmware on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/techhazard/teensy-firmware
[INFO] finished tweaking git repo https://github.com/techhazard/teensy-firmware
[INFO] tweaked toml for git repo https://github.com/techhazard/teensy-firmware written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/techhazard/teensy-firmware already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 7c79345e0e33fb58c590d262d16c0d1c111f60c27a8c8be4d4e24095e031eb3e
[INFO] running `"docker" "start" "-a" "7c79345e0e33fb58c590d262d16c0d1c111f60c27a8c8be4d4e24095e031eb3e"`
[INFO] [stderr]    Compiling teensy-firmware v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0463]: can't find crate for `core`
[INFO] [stderr]   |
[INFO] [stderr]   = note: the `thumbv7em-none-eabi` target may not be installed
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: could not compile `teensy-firmware`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7c79345e0e33fb58c590d262d16c0d1c111f60c27a8c8be4d4e24095e031eb3e"`
[INFO] running `"docker" "rm" "-f" "7c79345e0e33fb58c590d262d16c0d1c111f60c27a8c8be4d4e24095e031eb3e"`
[INFO] [stdout] 7c79345e0e33fb58c590d262d16c0d1c111f60c27a8c8be4d4e24095e031eb3e