[INFO] crate interrupture-stm32f7x6 0.1.0 is already in cache
[INFO] testing interrupture-stm32f7x6-0.1.0 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate interrupture-stm32f7x6 0.1.0 into work/builds/worker-6/source
[INFO] validating manifest of crates.io crate interrupture-stm32f7x6 0.1.0 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 crates.io crate interrupture-stm32f7x6 0.1.0
[INFO] finished tweaking crates.io crate interrupture-stm32f7x6 0.1.0
[INFO] tweaked toml for crates.io crate interrupture-stm32f7x6 0.1.0 written to work/builds/worker-6/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] 26473bd8caa066d8607e6be23e4581c85a29bb74bde75ac74426d40f0301cc07
[INFO] running `"docker" "start" "-a" "26473bd8caa066d8607e6be23e4581c85a29bb74bde75ac74426d40f0301cc07"`
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling cortex-m-rt v0.6.10
[INFO] [stderr]    Compiling r0 v0.2.2
[INFO] [stderr]    Compiling stm32f7 v0.3.2
[INFO] [stderr]    Compiling interrupture v0.1.1
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/interrupture-0.1.1/src/lib.rs:22:1
[INFO] [stderr]    |
[INFO] [stderr] 22 | #![feature(alloc_prelude)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/interrupture-0.1.1/src/lib.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #![feature(optin_builtin_traits)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `interrupture`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "26473bd8caa066d8607e6be23e4581c85a29bb74bde75ac74426d40f0301cc07"`
[INFO] running `"docker" "rm" "-f" "26473bd8caa066d8607e6be23e4581c85a29bb74bde75ac74426d40f0301cc07"`
[INFO] [stdout] 26473bd8caa066d8607e6be23e4581c85a29bb74bde75ac74426d40f0301cc07