[INFO] updating cached repository https://github.com/carbon-bond/carbonbond
[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] [stderr] From https://github.com/carbon-bond/carbonbond
[INFO] [stderr]  - [deleted]         (none)     -> board-page
[INFO] [stderr]  - [deleted]         (none)     -> feature-article-ui
[INFO] [stderr]  - [deleted]         (none)     -> jerry73204/fix-modern-diesel
[INFO] [stderr]    65fd9e8..7f17849  feature-chat-send   -> feature-chat-send
[INFO] [stderr]    7e9d8fd..267f6fd  feature-error-code  -> feature-error-code
[INFO] [stderr]  * [new branch]      feature-invite-page -> feature-invite-page
[INFO] [stderr]    5fcc178..61d5bae  master              -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 61d5bae36a87700d51f1e6ebcbca529d6bad6bf4
[INFO] testing carbon-bond/carbonbond against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcarbon-bond%2Fcarbonbond" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/carbon-bond/carbonbond 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/carbon-bond/carbonbond
[INFO] finished tweaking git repo https://github.com/carbon-bond/carbonbond
[INFO] tweaked toml for git repo https://github.com/carbon-bond/carbonbond written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/carbon-bond/carbonbond 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-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/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] a2e34923d5ecb602106df9b3e83bfb40bbb3a04a2c3404afabcb21ae51357280
[INFO] running `"docker" "start" "-a" "a2e34923d5ecb602106df9b3e83bfb40bbb3a04a2c3404afabcb21ae51357280"`
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling winapi v0.3.7
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]    Compiling ring v0.14.6
[INFO] [stderr]    Compiling combine v3.8.1
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling rand_core v0.5.0
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling blake2b_simd v0.5.7
[INFO] [stderr]    Compiling flate2 v1.0.11
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]    Compiling env_logger v0.6.2
[INFO] [stderr]    Compiling state v0.4.1
[INFO] [stderr]    Compiling tokio-udp v0.1.3
[INFO] [stderr]    Compiling actix-codec v0.1.2
[INFO] [stderr]    Compiling indexmap v1.1.0
[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/state-0.4.1/src/lib.rs:1:35
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(feature = "const_fn", feature(const_fn))]
[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 `state`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "a2e34923d5ecb602106df9b3e83bfb40bbb3a04a2c3404afabcb21ae51357280"`
[INFO] running `"docker" "rm" "-f" "a2e34923d5ecb602106df9b3e83bfb40bbb3a04a2c3404afabcb21ae51357280"`
[INFO] [stdout] a2e34923d5ecb602106df9b3e83bfb40bbb3a04a2c3404afabcb21ae51357280