[INFO] crate ssd1306 0.2.6 is already in cache
[INFO] extracting crate ssd1306 0.2.6 into work/ex/beta-1.38-1/sources/1.37.0/reg/ssd1306/0.2.6
[INFO] extracting crate ssd1306 0.2.6 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ssd1306/0.2.6
[INFO] validating manifest of ssd1306-0.2.6 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ssd1306-0.2.6 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ssd1306-0.2.6
[INFO] finished frobbing ssd1306-0.2.6
[INFO] frobbed toml for ssd1306-0.2.6 written to work/ex/beta-1.38-1/sources/1.37.0/reg/ssd1306/0.2.6/Cargo.toml
[INFO] started frobbing ssd1306-0.2.6
[INFO] finished frobbing ssd1306-0.2.6
[INFO] frobbed toml for ssd1306-0.2.6 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ssd1306/0.2.6/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ssd1306-0.2.6 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ssd1306/0.2.6:/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] a4ea30d151d144a743547001462287058fb449d5e5459afc7aede779b0c82d2c
[INFO] running `"docker" "start" "-a" "a4ea30d151d144a743547001462287058fb449d5e5459afc7aede779b0c82d2c"`
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling nb v0.1.2
[INFO] [stderr]    Compiling ssd1306 v0.2.6 (/opt/crater/workdir)
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr] error[E0463]: can't find crate for `core`
[INFO] [stderr]   |
[INFO] [stderr]   = note: the `thumbv7m-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 `nb`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0463]: can't find crate for `core`
[INFO] [stderr]   |
[INFO] [stderr]   = note: the `thumbv7m-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 `void`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "a4ea30d151d144a743547001462287058fb449d5e5459afc7aede779b0c82d2c"`
[INFO] running `"docker" "rm" "-f" "a4ea30d151d144a743547001462287058fb449d5e5459afc7aede779b0c82d2c"`
[INFO] [stdout] a4ea30d151d144a743547001462287058fb449d5e5459afc7aede779b0c82d2c