[INFO] updating cached repository stevenpack/learnnet
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/stevenpack/learnnet
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/stevenpack/learnnet" "work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/stevenpack/learnnet"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/stevenpack/learnnet'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/stevenpack/learnnet" "work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/stevenpack/learnnet"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/stevenpack/learnnet'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ff61a30bae7a50d1dd58226d4f50a43f39244a15
[INFO] sha for GitHub repo stevenpack/learnnet: ff61a30bae7a50d1dd58226d4f50a43f39244a15
[INFO] validating manifest of stevenpack/learnnet on toolchain master#c43d03a19f326f4a323569328cc501e86eb6d22e
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of stevenpack/learnnet on toolchain try#75eff020d0923c035c2fe220db4a0465cd847048
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing stevenpack/learnnet
[INFO] finished frobbing stevenpack/learnnet
[INFO] frobbed toml for stevenpack/learnnet written to work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/stevenpack/learnnet/Cargo.toml
[INFO] started frobbing stevenpack/learnnet
[INFO] finished frobbing stevenpack/learnnet
[INFO] frobbed toml for stevenpack/learnnet written to work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/stevenpack/learnnet/Cargo.toml
[INFO] crate stevenpack/learnnet already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking stevenpack/learnnet against try#75eff020d0923c035c2fe220db4a0465cd847048 for pr-63565
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63565/worker-7/try#75eff020d0923c035c2fe220db4a0465cd847048:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/stevenpack/learnnet:/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=forbid" "-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" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 610bb5acb5afd2ba218aa840702ba923f4b58e43ed13d8423cdac0f40ec7aec4
[INFO] running `"docker" "start" "-a" "610bb5acb5afd2ba218aa840702ba923f4b58e43ed13d8423cdac0f40ec7aec4"`
[INFO] [stderr]    Compiling libc v0.2.31
[INFO] [stderr]    Compiling either v1.2.0
[INFO] [stderr]    Compiling futures v0.1.16
[INFO] [stderr]    Compiling lazy_static v0.2.9
[INFO] [stderr]    Compiling openssl v0.9.20
[INFO] [stderr]    Compiling crc-core v0.1.0
[INFO] [stderr]    Compiling percent-encoding v1.0.0
[INFO] [stderr]    Compiling byteorder v1.1.0
[INFO] [stderr]    Compiling yansi v0.3.4
[INFO] [stderr]    Compiling serde v1.0.15
[INFO] [stderr] error[E0635]: unknown feature `const_atomic_bool_new`
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/yansi-0.3.4/src/lib.rs:1:40
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(feature="nightly", feature(const_atomic_bool_new))]
[INFO] [stderr]   |                                        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Checking build_const v0.2.0
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] error: Could not compile `yansi`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "610bb5acb5afd2ba218aa840702ba923f4b58e43ed13d8423cdac0f40ec7aec4"`
[INFO] running `"docker" "rm" "-f" "610bb5acb5afd2ba218aa840702ba923f4b58e43ed13d8423cdac0f40ec7aec4"`
[INFO] [stdout] 610bb5acb5afd2ba218aa840702ba923f4b58e43ed13d8423cdac0f40ec7aec4