[INFO] updating cached repository https://github.com/elba/elba
[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] 20e014fba3f9bc04e80c4802f1500a808f241dda
[INFO] testing elba/elba against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Felba%2Felba" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/elba/elba 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/elba/elba
[INFO] finished tweaking git repo https://github.com/elba/elba
[INFO] tweaked toml for git repo https://github.com/elba/elba written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/elba/elba 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/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] 2fc6ede614cc6216189517c24ffd2242eb6b99dc44adf12fa246bb47bba93c0e
[INFO] running `"docker" "start" "-a" "2fc6ede614cc6216189517c24ffd2242eb6b99dc44adf12fa246bb47bba93c0e"`
[INFO] [stderr]    Compiling serde v1.0.87
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling ndarray v0.12.1
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling serde v0.8.23
[INFO] [stderr]    Compiling encoding_rs v0.8.16
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling slog v2.4.1
[INFO] [stderr]    Compiling rust-ini v0.13.0
[INFO] [stderr]    Compiling symlink v0.1.0
[INFO] [stderr]    Compiling shell-escape v0.1.4
[INFO] [stderr]    Compiling crossbeam-utils v0.6.5
[INFO] [stderr]    Compiling openssl-sys v0.9.40
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling libssh2-sys v0.2.11
[INFO] [stderr]    Compiling curl-sys v0.4.16
[INFO] [stderr]    Compiling miniz-sys v0.1.11
[INFO] [stderr]    Compiling libgit2-sys v0.7.11
[INFO] [stderr]    Compiling want v0.0.6
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling signal-hook-registry v1.0.1
[INFO] [stderr]    Compiling termios v0.3.1
[INFO] [stderr]    Compiling isatty v0.1.9
[INFO] [stderr]    Compiling clicolors-control v0.2.0
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling directories v1.0.2
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling hashbrown v0.1.8
[INFO] [stderr]    Compiling term v0.5.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.5.2
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling combine v3.8.1
[INFO] [stderr]    Compiling nom v4.2.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.1
[INFO] [stderr]    Compiling tokio-executor v0.1.8
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.6.1
[INFO] [stderr]    Compiling crossbeam-channel v0.3.8
[INFO] [stderr]    Compiling libflate v0.1.19
[INFO] [stderr]    Compiling syn v0.15.26
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[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling signal-hook v0.1.9
[INFO] [stderr]    Compiling chrono v0.4.7
[INFO] [stderr]    Compiling tar v0.4.20
[INFO] [stderr]    Compiling crossbeam-deque v0.5.2
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[INFO] [stderr]    Compiling tokio-current-thread v0.1.6
[INFO] [stderr]    Compiling digest v0.7.6
[INFO] [stderr]    Compiling tokio-io v0.1.11
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling openssl v0.10.16
[INFO] [stderr]    Compiling native-tls v0.2.2
[INFO] [stderr]    Compiling sha2 v0.7.1
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling slog-async v2.3.0
[INFO] [stderr]    Compiling serde_test v0.8.23
[INFO] [stderr]    Compiling flate2 v1.0.6
[INFO] [stderr]    Compiling slog-term v2.4.0
[INFO] [stderr]    Compiling tokio-codec v0.1.1
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[INFO] [stderr]    Compiling linked-hash-map v0.3.0
[INFO] [stderr]    Compiling globset v0.4.2
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling serde-hjson v0.8.2
[INFO] [stderr]    Compiling yaml-rust v0.4.2
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling ignore v0.4.6
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling serde_derive v1.0.87
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling strsim v0.9.1
[INFO] [stderr]    Compiling simsearch v0.1.2
[INFO] [stderr]    Compiling toml_edit v0.1.5
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling indexmap v1.0.2
[INFO] [stderr]    Compiling serde_json v1.0.38
[INFO] [stderr]    Compiling serde_urlencoded v0.5.4
[INFO] [stderr]    Compiling toml v0.4.10
[INFO] [stderr]    Compiling url_serde v0.2.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling h2 v0.1.16
[INFO] [stderr]    Compiling semver_constraints v0.1.0
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling config v0.9.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling parking_lot v0.6.4
[INFO] [stderr]    Compiling crossbeam-channel v0.2.6
[INFO] [stderr]    Compiling crossbeam v0.4.1
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling tokio-threadpool v0.1.15
[INFO] [stderr]    Compiling uuid v0.7.2
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling parking_lot v0.7.1
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.6
[INFO] [stderr]    Compiling tokio-reactor v0.1.8
[INFO] [stderr]    Compiling console v0.6.2
[INFO] [stderr]    Compiling tokio-fs v0.1.6
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling tokio-udp v0.1.3
[INFO] [stderr]    Compiling tokio-uds v0.2.5
[INFO] [stderr]    Compiling tokio-signal v0.2.7
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling tokio-process v0.2.4
[INFO] [stderr]    Compiling hyper v0.12.24
[INFO] [stderr]    Compiling hyper-tls v0.3.1
[INFO] [stderr]    Compiling git2 v0.7.5
[INFO] [stderr]    Compiling reqwest v0.9.9
[INFO] [stderr]    Compiling elba v0.3.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(async_await)]
[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 `elba`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2fc6ede614cc6216189517c24ffd2242eb6b99dc44adf12fa246bb47bba93c0e"`
[INFO] running `"docker" "rm" "-f" "2fc6ede614cc6216189517c24ffd2242eb6b99dc44adf12fa246bb47bba93c0e"`
[INFO] [stdout] 2fc6ede614cc6216189517c24ffd2242eb6b99dc44adf12fa246bb47bba93c0e