[INFO] cloning repository https://github.com/kz2d/lisp_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kz2d/lisp_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkz2d%2Flisp_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkz2d%2Flisp_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8017d7e49ac5410b924e59e2361529715eb0a561
[INFO] testing kz2d/lisp_rust against 1.90.0 for beta-1.91-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkz2d%2Flisp_rust" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kz2d/lisp_rust
[INFO] finished tweaking git repo https://github.com/kz2d/lisp_rust
[INFO] tweaked toml for git repo https://github.com/kz2d/lisp_rust written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kz2d/lisp_rust on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kz2d/lisp_rust 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1bd19a13177935725e2eb9ce5e92d0fd1fff669aefac4848adea86038d67ad04
[INFO] running `Command { std: "docker" "start" "-a" "1bd19a13177935725e2eb9ce5e92d0fd1fff669aefac4848adea86038d67ad04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1bd19a13177935725e2eb9ce5e92d0fd1fff669aefac4848adea86038d67ad04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bd19a13177935725e2eb9ce5e92d0fd1fff669aefac4848adea86038d67ad04", kill_on_drop: false }`
[INFO] [stdout] 1bd19a13177935725e2eb9ce5e92d0fd1fff669aefac4848adea86038d67ad04
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52a00e5ff78bcbd1ea8eec16c36569558a7b54d34c5da9039da3e12ba0b48271
[INFO] running `Command { std: "docker" "start" "-a" "52a00e5ff78bcbd1ea8eec16c36569558a7b54d34c5da9039da3e12ba0b48271", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.75
[INFO] [stderr]    Compiling lisp v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(if_let_guard)]
[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 `lisp` (bin "lisp") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "52a00e5ff78bcbd1ea8eec16c36569558a7b54d34c5da9039da3e12ba0b48271", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52a00e5ff78bcbd1ea8eec16c36569558a7b54d34c5da9039da3e12ba0b48271", kill_on_drop: false }`
[INFO] [stdout] 52a00e5ff78bcbd1ea8eec16c36569558a7b54d34c5da9039da3e12ba0b48271