[INFO] cloning repository https://github.com/exscape/float-bug-testcase
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/exscape/float-bug-testcase" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fexscape%2Ffloat-bug-testcase", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fexscape%2Ffloat-bug-testcase'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 125379c1f9663e55b2a2a44465ac4ba0f315c316
[INFO] testing exscape/float-bug-testcase against try#03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fexscape%2Ffloat-bug-testcase" "/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/exscape/float-bug-testcase on toolchain 03a1ea71b075ab964b5278bc6e74cd6c52c36ee0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/exscape/float-bug-testcase
[INFO] finished tweaking git repo https://github.com/exscape/float-bug-testcase
[INFO] tweaked toml for git repo https://github.com/exscape/float-bug-testcase written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/exscape/float-bug-testcase already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "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" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "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] 0fd290c8b98ec8b2f7020b0dde8a3ae163f544e9e5a213fbe0eb2a98320d0347
[INFO] running `Command { std: "docker" "start" "-a" "0fd290c8b98ec8b2f7020b0dde8a3ae163f544e9e5a213fbe0eb2a98320d0347", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0fd290c8b98ec8b2f7020b0dde8a3ae163f544e9e5a213fbe0eb2a98320d0347", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fd290c8b98ec8b2f7020b0dde8a3ae163f544e9e5a213fbe0eb2a98320d0347", kill_on_drop: false }`
[INFO] [stdout] 0fd290c8b98ec8b2f7020b0dde8a3ae163f544e9e5a213fbe0eb2a98320d0347
[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" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 499f52bee0c43f9d7290ac3304ac51f89c699c00fe87d51b6ff9e0a9bcebf32f
[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" "499f52bee0c43f9d7290ac3304ac51f89c699c00fe87d51b6ff9e0a9bcebf32f", kill_on_drop: false }`
[INFO] [stderr]    Compiling float-bug-testcase v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: malformed `unwind` attribute input
[INFO] [stdout]   --> src/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     #[unwind]
[INFO] [stdout]    |     ^^^^^^^^^ help: must be of the form: `#[unwind(allowed|aborts)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     #[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 `float-bug-testcase`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "499f52bee0c43f9d7290ac3304ac51f89c699c00fe87d51b6ff9e0a9bcebf32f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "499f52bee0c43f9d7290ac3304ac51f89c699c00fe87d51b6ff9e0a9bcebf32f", kill_on_drop: false }`
[INFO] [stdout] 499f52bee0c43f9d7290ac3304ac51f89c699c00fe87d51b6ff9e0a9bcebf32f