[INFO] updating cached repository https://github.com/Johni0702/mumble-web-proxy
[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] 20848303e961402c6175b438882e7af51b1c6c1b
[INFO] testing Johni0702/mumble-web-proxy against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohni0702%2Fmumble-web-proxy" "work/builds/worker-10/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Johni0702/mumble-web-proxy 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/Johni0702/mumble-web-proxy
[INFO] finished tweaking git repo https://github.com/Johni0702/mumble-web-proxy
[INFO] tweaked toml for git repo https://github.com/Johni0702/mumble-web-proxy written to work/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/Johni0702/mumble-web-proxy 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] running `"docker" "create" "-v" "/big/crater/work/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-10/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] e27002b4a17d216b82c21cf1130c7e27297fa138e2c72a3a3b757afeec30cbea
[INFO] running `"docker" "start" "-a" "e27002b4a17d216b82c21cf1130c7e27297fa138e2c72a3a3b757afeec30cbea"`
[INFO] [stderr]    Compiling protobuf v2.2.0
[INFO] [stderr]    Compiling bindgen v0.42.3
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling proc-macro2 v0.3.5
[INFO] [stderr]    Compiling block-padding v0.1.3
[INFO] [stderr]    Compiling handy_async v0.2.13
[INFO] [stderr]    Compiling webrtc-sdp v0.1.0 (https://github.com/nils-ohlmeier/rsdparsa/?rev=ccf6249#ccf62490)
[INFO] [stderr]    Compiling memchr v2.1.3
[INFO] [stderr]    Compiling which v1.0.5
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling clang-sys v0.26.4
[INFO] [stderr]    Compiling input_buffer v0.2.0
[INFO] [stderr]    Compiling tokio-tls v0.2.0
[INFO] [stderr]    Compiling tokio-threadpool v0.1.9
[INFO] [stderr]    Compiling tokio-reactor v0.1.7
[INFO] [stderr]    Compiling block-buffer v0.7.2
[INFO] [stderr]    Compiling sha-1 v0.8.1
[INFO] [stderr]    Compiling quote v0.5.2
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling nom v4.2.0
[INFO] [stderr]    Compiling tungstenite v0.6.1
[INFO] [stderr]    Compiling tokio-uds v0.2.4
[INFO] [stderr]    Compiling tokio-tcp v0.1.2
[INFO] [stderr]    Compiling tokio-udp v0.1.3
[INFO] [stderr]    Compiling tokio-fs v0.1.4
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]    Compiling trackable v0.1.8
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling tokio v0.1.13
[INFO] [stderr]    Compiling cexpr v0.3.4
[INFO] [stderr]    Compiling tokio-dns-unofficial v0.3.1
[INFO] [stderr]    Compiling tokio-core v0.1.17
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]    Compiling tokio-tungstenite v0.6.0
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling protobuf-codegen v2.2.0
[INFO] [stderr]    Compiling rtp v0.1.0 (https://github.com/johni0702/rtp?rev=ee8be93#ee8be938)
[INFO] [stderr]    Compiling protobuf-codegen-pure v2.2.0
[INFO] [stderr]    Compiling mumble-protocol v0.1.0
[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/mumble-protocol-0.1.0/src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(try_from)]
[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 `mumble-protocol`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "e27002b4a17d216b82c21cf1130c7e27297fa138e2c72a3a3b757afeec30cbea"`
[INFO] running `"docker" "rm" "-f" "e27002b4a17d216b82c21cf1130c7e27297fa138e2c72a3a3b757afeec30cbea"`
[INFO] [stdout] e27002b4a17d216b82c21cf1130c7e27297fa138e2c72a3a3b757afeec30cbea