[INFO] updating cached repository Rahix/leonardo-examples
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Rahix/leonardo-examples
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Rahix/leonardo-examples" "work/ex/beta-1.38-1/sources/1.37.0/gh/Rahix/leonardo-examples"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Rahix/leonardo-examples'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Rahix/leonardo-examples" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Rahix/leonardo-examples"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Rahix/leonardo-examples'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1a3265cb56725a67739c0c1140e3d98d084fdafe
[INFO] sha for GitHub repo Rahix/leonardo-examples: 1a3265cb56725a67739c0c1140e3d98d084fdafe
[INFO] validating manifest of Rahix/leonardo-examples 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 Rahix/leonardo-examples 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 Rahix/leonardo-examples
[INFO] finished frobbing Rahix/leonardo-examples
[INFO] frobbed toml for Rahix/leonardo-examples written to work/ex/beta-1.38-1/sources/1.37.0/gh/Rahix/leonardo-examples/Cargo.toml
[INFO] started frobbing Rahix/leonardo-examples
[INFO] finished frobbing Rahix/leonardo-examples
[INFO] frobbed toml for Rahix/leonardo-examples written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Rahix/leonardo-examples/Cargo.toml
[INFO] crate Rahix/leonardo-examples already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing Rahix/leonardo-examples 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-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Rahix/leonardo-examples:/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] b62f639514ddaee7665aa2ea66ba4003a67c015f7b0c2586de1d636d78f22ff9
[INFO] running `"docker" "start" "-a" "b62f639514ddaee7665aa2ea66ba4003a67c015f7b0c2586de1d636d78f22ff9"`
[INFO] [stderr]    Compiling nb v0.1.1
[INFO] [stderr]    Compiling bare-metal v0.2.3
[INFO] [stderr]    Compiling vcell v0.1.0
[INFO] [stderr]    Compiling atmega32u4 v0.1.3
[INFO] [stderr]    Compiling embedded-hal v0.2.1
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/atmega32u4-0.1.3/src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(asm, const_fn, try_from)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `atmega32u4`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b62f639514ddaee7665aa2ea66ba4003a67c015f7b0c2586de1d636d78f22ff9"`
[INFO] running `"docker" "rm" "-f" "b62f639514ddaee7665aa2ea66ba4003a67c015f7b0c2586de1d636d78f22ff9"`
[INFO] [stdout] b62f639514ddaee7665aa2ea66ba4003a67c015f7b0c2586de1d636d78f22ff9