[INFO] updating cached repository nikomatsakis/mathema
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nikomatsakis/mathema
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nikomatsakis/mathema" "work/ex/beta-1.37-6/sources/1.36.0/gh/nikomatsakis/mathema"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/nikomatsakis/mathema'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nikomatsakis/mathema" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/nikomatsakis/mathema"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/nikomatsakis/mathema'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 543b2071a9173b2ba9be3f5138205594f3e43129
[INFO] sha for GitHub repo nikomatsakis/mathema: 543b2071a9173b2ba9be3f5138205594f3e43129
[INFO] validating manifest of nikomatsakis/mathema on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of nikomatsakis/mathema on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing nikomatsakis/mathema
[INFO] finished frobbing nikomatsakis/mathema
[INFO] frobbed toml for nikomatsakis/mathema written to work/ex/beta-1.37-6/sources/1.36.0/gh/nikomatsakis/mathema/Cargo.toml
[INFO] started frobbing nikomatsakis/mathema
[INFO] finished frobbing nikomatsakis/mathema
[INFO] frobbed toml for nikomatsakis/mathema written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/nikomatsakis/mathema/Cargo.toml
[INFO] crate nikomatsakis/mathema already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing nikomatsakis/mathema against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/nikomatsakis/mathema:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] df7a01564116615718ba825f4b26450455225063908cde8bf81559dfd3afd918
[INFO] running `"docker" "start" "-a" "df7a01564116615718ba825f4b26450455225063908cde8bf81559dfd3afd918"`
[INFO] [stderr]    Compiling serde v1.0.91
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling slog v2.4.1
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling curl-sys v0.4.18
[INFO] [stderr]    Compiling libssh2-sys v0.2.11
[INFO] [stderr]    Compiling libgit2-sys v0.7.11
[INFO] [stderr]    Compiling regex-syntax v0.5.6
[INFO] [stderr]    Compiling tokio-executor v0.1.7
[INFO] [stderr]    Compiling want v0.0.6
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling isatty v0.1.9
[INFO] [stderr]    Compiling nix v0.9.0
[INFO] [stderr]    Compiling twoway v0.1.8
[INFO] [stderr]    Compiling buf_redux v0.8.1
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling rust-embed-impl v4.4.0
[INFO] [stderr]    Compiling structopt-derive v0.1.6
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling tokio-current-thread v0.1.6
[INFO] [stderr]    Compiling tokio-timer v0.2.10
[INFO] [stderr]    Compiling regex v1.1.7
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling structopt v0.1.7
[INFO] [stderr]    Compiling rust-embed v4.4.0
[INFO] [stderr]    Compiling tokio-threadpool v0.1.14
[INFO] [stderr]    Compiling slog-async v2.3.0
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling h2 v0.1.18
[INFO] [stderr]    Compiling atomicwrites v0.1.5
[INFO] [stderr]    Compiling mime_guess v1.8.7
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling multipart v0.15.4
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling env_logger v0.6.1
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling http-service v0.2.0
[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/http-service-0.2.0/src/lib.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | #![feature(async_await, await_macro, arbitrary_self_types)]
[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 `http-service`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "df7a01564116615718ba825f4b26450455225063908cde8bf81559dfd3afd918"`
[INFO] running `"docker" "rm" "-f" "df7a01564116615718ba825f4b26450455225063908cde8bf81559dfd3afd918"`
[INFO] [stdout] df7a01564116615718ba825f4b26450455225063908cde8bf81559dfd3afd918