[INFO] fetching crate coap-handler 0.0.1...
[INFO] testing coap-handler-0.0.1 against 1.49.0 for beta-1.50-1
[INFO] extracting crate coap-handler 0.0.1 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate coap-handler 0.0.1 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 crates.io crate coap-handler 0.0.1
[INFO] finished tweaking crates.io crate coap-handler 0.0.1
[INFO] tweaked toml for crates.io crate coap-handler 0.0.1 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stdout] 184c19d13593bbec12cb6820aabe7155c0aaed31029872fafad9600fda199540
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "184c19d13593bbec12cb6820aabe7155c0aaed31029872fafad9600fda199540", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "184c19d13593bbec12cb6820aabe7155c0aaed31029872fafad9600fda199540", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "184c19d13593bbec12cb6820aabe7155c0aaed31029872fafad9600fda199540", kill_on_drop: false }`
[INFO] [stdout] 184c19d13593bbec12cb6820aabe7155c0aaed31029872fafad9600fda199540
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stdout] a51b57ac7d565add5d97267fb28aa432a428bc1d67d9eefef3ebc3d2dea07f5f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a51b57ac7d565add5d97267fb28aa432a428bc1d67d9eefef3ebc3d2dea07f5f", kill_on_drop: false }`
[INFO] [stderr]    Compiling coap-numbers v0.1.2
[INFO] [stderr]    Compiling coap-message v0.1.0
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling windowed-infinity v0.1.1
[INFO] [stderr]    Compiling coap-handler v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:39:1
[INFO] [stdout]    |
[INFO] [stdout] 39 | #![feature(iter_order_by)]
[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 `coap-handler`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "a51b57ac7d565add5d97267fb28aa432a428bc1d67d9eefef3ebc3d2dea07f5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a51b57ac7d565add5d97267fb28aa432a428bc1d67d9eefef3ebc3d2dea07f5f", kill_on_drop: false }`
[INFO] [stdout] a51b57ac7d565add5d97267fb28aa432a428bc1d67d9eefef3ebc3d2dea07f5f