[INFO] cloning repository https://github.com/jonathanmcelroy/rust_progress_server
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jonathanmcelroy/rust_progress_server" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonathanmcelroy%2Frust_progress_server", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonathanmcelroy%2Frust_progress_server'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 21a981a08d3ee14c12897718b91d6fbb30570682
[INFO] testing jonathanmcelroy/rust_progress_server against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonathanmcelroy%2Frust_progress_server" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jonathanmcelroy/rust_progress_server on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jonathanmcelroy/rust_progress_server
[INFO] finished tweaking git repo https://github.com/jonathanmcelroy/rust_progress_server
[INFO] tweaked toml for git repo https://github.com/jonathanmcelroy/rust_progress_server written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/jonathanmcelroy/rust_progress_server already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 77a8d4541eddcb44aa3f0952db9365de2f993f471ef043ab1612e3c733009660
[INFO] running `Command { std: "docker" "start" "-a" "77a8d4541eddcb44aa3f0952db9365de2f993f471ef043ab1612e3c733009660", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "77a8d4541eddcb44aa3f0952db9365de2f993f471ef043ab1612e3c733009660", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77a8d4541eddcb44aa3f0952db9365de2f993f471ef043ab1612e3c733009660", kill_on_drop: false }`
[INFO] [stdout] 77a8d4541eddcb44aa3f0952db9365de2f993f471ef043ab1612e3c733009660
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2b8373891b385aa24f5bed8f7fd23fcd9fa6fd34d07596de8b679b346fc93425
[INFO] running `Command { std: "docker" "start" "-a" "2b8373891b385aa24f5bed8f7fd23fcd9fa6fd34d07596de8b679b346fc93425", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.21
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]    Compiling matches v0.1.4
[INFO] [stderr]    Compiling version_check v0.1.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.4
[INFO] [stderr]    Compiling ansi_term v0.9.0
[INFO] [stderr]    Compiling log v0.3.7
[INFO] [stderr]    Compiling rustc-serialize v0.3.23
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]    Compiling httparse v1.2.1
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stderr]    Compiling term v0.4.5
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling toml v0.2.1
[INFO] [stderr]    Compiling state v0.2.0
[INFO] [stderr]    Compiling num-traits v0.1.37
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/state-0.2.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `state`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2b8373891b385aa24f5bed8f7fd23fcd9fa6fd34d07596de8b679b346fc93425", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b8373891b385aa24f5bed8f7fd23fcd9fa6fd34d07596de8b679b346fc93425", kill_on_drop: false }`
[INFO] [stdout] 2b8373891b385aa24f5bed8f7fd23fcd9fa6fd34d07596de8b679b346fc93425