[INFO] updating cached repository https://github.com/SimonSapin/rust-on-bbc-microbit
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 78c18b0c62cf695cea804735e74d29caee557b6a
[INFO] testing SimonSapin/rust-on-bbc-microbit against master#8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSimonSapin%2Frust-on-bbc-microbit" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/SimonSapin/rust-on-bbc-microbit on toolchain 8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/SimonSapin/rust-on-bbc-microbit
[INFO] finished tweaking git repo https://github.com/SimonSapin/rust-on-bbc-microbit
[INFO] tweaked toml for git repo https://github.com/SimonSapin/rust-on-bbc-microbit written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/SimonSapin/rust-on-bbc-microbit already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2e6431a192ce01656d7516e6d758444fcbb0996c989c9c8a94582ca0ee70c5ae
[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" "2e6431a192ce01656d7516e6d758444fcbb0996c989c9c8a94582ca0ee70c5ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2e6431a192ce01656d7516e6d758444fcbb0996c989c9c8a94582ca0ee70c5ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e6431a192ce01656d7516e6d758444fcbb0996c989c9c8a94582ca0ee70c5ae", kill_on_drop: false }`
[INFO] [stdout] 2e6431a192ce01656d7516e6d758444fcbb0996c989c9c8a94582ca0ee70c5ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 40ba3a5022af85cac3b3d0dcc586fd929f02628b6d145e781bde3a6c72b9e035
[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" "40ba3a5022af85cac3b3d0dcc586fd929f02628b6d145e781bde3a6c72b9e035", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust-on-bbc-microbit v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: the legacy LLVM-style asm! syntax is no longer supported
[INFO] [stdout]   --> src/busy_loop.rs:16:14
[INFO] [stdout]    |
[INFO] [stdout] 16 |     unsafe { asm!("" : : "r"(&dummy)) }
[INFO] [stdout]    |              ----^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: replace with: `llvm_asm!`
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider migrating to the new asm! syntax specified in RFC 2873
[INFO] [stdout]    = note: alternatively, switch to llvm_asm! to keep your code working as it is
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stdout]   --> src/lib.rs:29:1
[INFO] [stdout]    |
[INFO] [stdout] 29 | #[lang = "panic_fmt"]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^ definition of unknown language item `panic_fmt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `#[panic_handler]` function required, but not found
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0522`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-on-bbc-microbit`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "40ba3a5022af85cac3b3d0dcc586fd929f02628b6d145e781bde3a6c72b9e035", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40ba3a5022af85cac3b3d0dcc586fd929f02628b6d145e781bde3a6c72b9e035", kill_on_drop: false }`
[INFO] [stdout] 40ba3a5022af85cac3b3d0dcc586fd929f02628b6d145e781bde3a6c72b9e035