[INFO] updating cached repository vain0x/competo
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/vain0x/competo
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/vain0x/competo" "work/ex/beta-1.38-1/sources/1.37.0/gh/vain0x/competo"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/vain0x/competo'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/vain0x/competo" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vain0x/competo"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vain0x/competo'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2eabac9240c6105965d99e41f8ea0e2d5a59cbfc
[INFO] sha for GitHub repo vain0x/competo: 2eabac9240c6105965d99e41f8ea0e2d5a59cbfc
[INFO] validating manifest of vain0x/competo 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 vain0x/competo 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 vain0x/competo
[INFO] finished frobbing vain0x/competo
[INFO] frobbed toml for vain0x/competo written to work/ex/beta-1.38-1/sources/1.37.0/gh/vain0x/competo/Cargo.toml
[INFO] started frobbing vain0x/competo
[INFO] finished frobbing vain0x/competo
[INFO] frobbed toml for vain0x/competo written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vain0x/competo/Cargo.toml
[INFO] crate vain0x/competo 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing vain0x/competo 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-4/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/vain0x/competo:/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] 8bbf871470f725f8df2cde14102774c47cd57853b308fd6e4d3e702e361a30b2
[INFO] running `"docker" "start" "-a" "8bbf871470f725f8df2cde14102774c47cd57853b308fd6e4d3e702e361a30b2"`
[INFO] [stderr]    Compiling rustc-rayon-core v0.1.1
[INFO] [stderr]    Compiling stable_deref_trait v1.1.0
[INFO] [stderr]    Compiling rustc-ap-serialize v196.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_target v196.0.0
[INFO] [stderr]    Compiling scoped-tls v0.1.2
[INFO] [stderr]    Compiling rustc-ap-syntax v196.0.0
[INFO] [stderr]    Compiling rustfmt-nightly v0.8.3
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[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/scoped-tls-0.1.2/src/lib.rs:47:34
[INFO] [stderr]    |
[INFO] [stderr] 47 | #![cfg_attr(feature = "nightly", feature(macro_vis_matcher))]
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/scoped-tls-0.1.2/src/lib.rs:48:34
[INFO] [stderr]    |
[INFO] [stderr] 48 | #![cfg_attr(feature = "nightly", feature(allow_internal_unstable))]
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/rustc-ap-serialize-196.0.0/lib.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | #![feature(rustc_private, box_syntax)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/rustc-ap-serialize-196.0.0/lib.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | #![feature(core_intrinsics)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/rustc-ap-serialize-196.0.0/lib.rs:27:1
[INFO] [stderr]    |
[INFO] [stderr] 27 | #![feature(specialization)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/rustc-ap-serialize-196.0.0/lib.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #![feature(never_type)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling rustc-hash v1.0.1
[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 `scoped-tls`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rustc-ap-serialize`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "8bbf871470f725f8df2cde14102774c47cd57853b308fd6e4d3e702e361a30b2"`
[INFO] running `"docker" "rm" "-f" "8bbf871470f725f8df2cde14102774c47cd57853b308fd6e4d3e702e361a30b2"`
[INFO] [stdout] 8bbf871470f725f8df2cde14102774c47cd57853b308fd6e4d3e702e361a30b2