[INFO] updating cached repository https://github.com/nikomatsakis/mathema
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 543b2071a9173b2ba9be3f5138205594f3e43129
[INFO] testing nikomatsakis/mathema against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikomatsakis%2Fmathema" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nikomatsakis/mathema on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/nikomatsakis/mathema
[INFO] finished tweaking git repo https://github.com/nikomatsakis/mathema
[INFO] tweaked toml for git repo https://github.com/nikomatsakis/mathema written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/nikomatsakis/mathema already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 71e2880e19e5821a38012ef52eeceba123cdba9f7d4e0a18509af7b146daf5ea
[INFO] running `"docker" "start" "-a" "71e2880e19e5821a38012ef52eeceba123cdba9f7d4e0a18509af7b146daf5ea"`
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling serde v1.0.91
[INFO] [stderr]    Compiling slog v2.4.1
[INFO] [stderr]    Compiling take_mut v0.2.2
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling tokio-sync v0.1.5
[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 itertools v0.7.11
[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 buf_redux v0.8.1
[INFO] [stderr]    Compiling twoway v0.1.8
[INFO] [stderr]    Compiling aho-corasick v0.6.10
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling num-integer v0.1.39
[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 regex v1.1.7
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling tokio-current-thread v0.1.6
[INFO] [stderr]    Compiling tokio-timer v0.2.10
[INFO] [stderr]    Compiling cookie v0.11.1
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling structopt v0.1.7
[INFO] [stderr]    Compiling tokio-threadpool v0.1.14
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling rust-embed v4.4.0
[INFO] [stderr]    Compiling h2 v0.1.18
[INFO] [stderr]    Compiling mime_guess v1.8.7
[INFO] [stderr]    Compiling slog-async v2.3.0
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling atomicwrites v0.1.5
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling env_logger v0.6.1
[INFO] [stderr]    Compiling http-service v0.2.0
[INFO] [stderr] error: incorrect use of `await`
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/http-service-0.2.0/src/lib.rs:102:33
[INFO] [stderr]     |
[INFO] [stderr] 102 |         while let Some(chunk) = await!(self.next()) {
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^^^^^^^ help: `await` is a postfix operation: `self.next().await`
[INFO] [stderr] 
[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/http-service-0.2.0/src/lib.rs:60:25
[INFO] [stderr]    |
[INFO] [stderr] 60 | #![feature(async_await, await_macro, arbitrary_self_types)]
[INFO] [stderr]    |                         ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: subsumed by `.await` syntax
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/http-service-0.2.0/src/lib.rs:60:25
[INFO] [stderr]    |
[INFO] [stderr] 60 | #![feature(async_await, await_macro, arbitrary_self_types)]
[INFO] [stderr]    |                         ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/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 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0557.
[INFO] [stderr] For more information about an 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" "71e2880e19e5821a38012ef52eeceba123cdba9f7d4e0a18509af7b146daf5ea"`
[INFO] running `"docker" "rm" "-f" "71e2880e19e5821a38012ef52eeceba123cdba9f7d4e0a18509af7b146daf5ea"`
[INFO] [stdout] 71e2880e19e5821a38012ef52eeceba123cdba9f7d4e0a18509af7b146daf5ea