[INFO] cloning repository https://github.com/IkBenOlie5/math_interpreter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/IkBenOlie5/math_interpreter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIkBenOlie5%2Fmath_interpreter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIkBenOlie5%2Fmath_interpreter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 708eba6ced439175c6961aadbe582ac64b264d3c
[INFO] testing IkBenOlie5/math_interpreter against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIkBenOlie5%2Fmath_interpreter" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/IkBenOlie5/math_interpreter on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/IkBenOlie5/math_interpreter
[INFO] finished tweaking git repo https://github.com/IkBenOlie5/math_interpreter
[INFO] tweaked toml for git repo https://github.com/IkBenOlie5/math_interpreter written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/IkBenOlie5/math_interpreter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "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] 4e71368c8863cb732db893640a7354af9962f1d6d443f7bc75ce5dcaab0adfbb
[INFO] running `Command { std: "docker" "start" "-a" "4e71368c8863cb732db893640a7354af9962f1d6d443f7bc75ce5dcaab0adfbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e71368c8863cb732db893640a7354af9962f1d6d443f7bc75ce5dcaab0adfbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e71368c8863cb732db893640a7354af9962f1d6d443f7bc75ce5dcaab0adfbb", kill_on_drop: false }`
[INFO] [stdout] 4e71368c8863cb732db893640a7354af9962f1d6d443f7bc75ce5dcaab0adfbb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "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] 3c14b5de9ce4ca74c3760c93a8d19be381d1e05de99b5506a3dfa2e36cdb2fea
[INFO] running `Command { std: "docker" "start" "-a" "3c14b5de9ce4ca74c3760c93a8d19be381d1e05de99b5506a3dfa2e36cdb2fea", kill_on_drop: false }`
[INFO] [stderr]    Compiling math_interpreter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[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 `math_interpreter` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "3c14b5de9ce4ca74c3760c93a8d19be381d1e05de99b5506a3dfa2e36cdb2fea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c14b5de9ce4ca74c3760c93a8d19be381d1e05de99b5506a3dfa2e36cdb2fea", kill_on_drop: false }`
[INFO] [stdout] 3c14b5de9ce4ca74c3760c93a8d19be381d1e05de99b5506a3dfa2e36cdb2fea