[INFO] cloning repository https://github.com/mikialex/rxsl
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mikialex/rxsl" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmikialex%2Frxsl", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmikialex%2Frxsl'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 84e1774d0b251d78e0bab65cf60c2693689f7739
[INFO] testing mikialex/rxsl against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmikialex%2Frxsl" "/workspace/builds/worker-98/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-98/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mikialex/rxsl on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mikialex/rxsl
[INFO] finished tweaking git repo https://github.com/mikialex/rxsl
[INFO] tweaked toml for git repo https://github.com/mikialex/rxsl written to /workspace/builds/worker-98/source/Cargo.toml
[INFO] crate git repo https://github.com/mikialex/rxsl already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 448c33665813866a4cb42d3cdbc22e7c12915c1cd15f9e08007ec150b8d7d65a
[INFO] running `Command { std: "docker" "start" "-a" "448c33665813866a4cb42d3cdbc22e7c12915c1cd15f9e08007ec150b8d7d65a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "448c33665813866a4cb42d3cdbc22e7c12915c1cd15f9e08007ec150b8d7d65a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "448c33665813866a4cb42d3cdbc22e7c12915c1cd15f9e08007ec150b8d7d65a", kill_on_drop: false }`
[INFO] [stdout] 448c33665813866a4cb42d3cdbc22e7c12915c1cd15f9e08007ec150b8d7d65a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3bece4981f8fc0970e477a5457e45a3aa17b0b73a31717a970735dd1bbe381db
[INFO] running `Command { std: "docker" "start" "-a" "3bece4981f8fc0970e477a5457e45a3aa17b0b73a31717a970735dd1bbe381db", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling fixedbitset v0.2.0
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]    Compiling rxsl v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(bool_to_option)]
[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 `rxsl` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "3bece4981f8fc0970e477a5457e45a3aa17b0b73a31717a970735dd1bbe381db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bece4981f8fc0970e477a5457e45a3aa17b0b73a31717a970735dd1bbe381db", kill_on_drop: false }`
[INFO] [stdout] 3bece4981f8fc0970e477a5457e45a3aa17b0b73a31717a970735dd1bbe381db