[INFO] cloning repository https://github.com/Violet-Codes/brainfuck-optimiser
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Violet-Codes/brainfuck-optimiser" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FViolet-Codes%2Fbrainfuck-optimiser", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FViolet-Codes%2Fbrainfuck-optimiser'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 56ea312978a7387af5149b2f2f49eed2b2a09f39
[INFO] checking Violet-Codes/brainfuck-optimiser against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FViolet-Codes%2Fbrainfuck-optimiser" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-5-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/Violet-Codes/brainfuck-optimiser
[INFO] finished tweaking git repo https://github.com/Violet-Codes/brainfuck-optimiser
[INFO] tweaked toml for git repo https://github.com/Violet-Codes/brainfuck-optimiser written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Violet-Codes/brainfuck-optimiser on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Violet-Codes/brainfuck-optimiser already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/Violet-Codes/nibbler`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 16a85089fbb09e4398ad8bad411cc76af27cf257b832d5187251de441baa4946
[INFO] running `Command { std: "docker" "start" "-a" "16a85089fbb09e4398ad8bad411cc76af27cf257b832d5187251de441baa4946", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "16a85089fbb09e4398ad8bad411cc76af27cf257b832d5187251de441baa4946", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16a85089fbb09e4398ad8bad411cc76af27cf257b832d5187251de441baa4946", kill_on_drop: false }`
[INFO] [stdout] 16a85089fbb09e4398ad8bad411cc76af27cf257b832d5187251de441baa4946
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2d64fa33ebeba70ed1c1b6f6afcb64e73447b3bd2f1ed24fed6666ac1fe341dd
[INFO] running `Command { std: "docker" "start" "-a" "2d64fa33ebeba70ed1c1b6f6afcb64e73447b3bd2f1ed24fed6666ac1fe341dd", kill_on_drop: false }`
[INFO] [stderr]     Checking nibbler v0.1.0 (https://github.com/Violet-Codes/nibbler#40359bf6)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/git/checkouts/nibbler-a207404b05c58f6c/40359bf/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iter_next_chunk)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nibbler` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "2d64fa33ebeba70ed1c1b6f6afcb64e73447b3bd2f1ed24fed6666ac1fe341dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d64fa33ebeba70ed1c1b6f6afcb64e73447b3bd2f1ed24fed6666ac1fe341dd", kill_on_drop: false }`
[INFO] [stdout] 2d64fa33ebeba70ed1c1b6f6afcb64e73447b3bd2f1ed24fed6666ac1fe341dd