[INFO] cloning repository https://github.com/karmaio-rs/karmaio
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/karmaio-rs/karmaio" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkarmaio-rs%2Fkarmaio", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkarmaio-rs%2Fkarmaio'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9e79e5582d01a03fedb669b3e5d27261c145a770
[INFO] testing karmaio-rs/karmaio against beta-2026-04-21 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkarmaio-rs%2Fkarmaio" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/karmaio-rs/karmaio
[INFO] finished tweaking git repo https://github.com/karmaio-rs/karmaio
[INFO] tweaked toml for git repo https://github.com/karmaio-rs/karmaio written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/karmaio-rs/karmaio on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/karmaio-rs/karmaio 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" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 36a9ab3b1908e04eb2cc78a79d39433ebaa4103f2d53a79db7d3f5781e9478ab
[INFO] running `Command { std: "docker" "start" "-a" "36a9ab3b1908e04eb2cc78a79d39433ebaa4103f2d53a79db7d3f5781e9478ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "36a9ab3b1908e04eb2cc78a79d39433ebaa4103f2d53a79db7d3f5781e9478ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36a9ab3b1908e04eb2cc78a79d39433ebaa4103f2d53a79db7d3f5781e9478ab", kill_on_drop: false }`
[INFO] [stdout] 36a9ab3b1908e04eb2cc78a79d39433ebaa4103f2d53a79db7d3f5781e9478ab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e20f1e4fa0012abfe5eff275448de4efd6f660704c2d73ef8cdd4b9ab001c703
[INFO] running `Command { std: "docker" "start" "-a" "e20f1e4fa0012abfe5eff275448de4efd6f660704c2d73ef8cdd4b9ab001c703", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.180
[INFO] [stderr]    Compiling io-uring v0.6.4
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling karmaio v0.1.0 (/opt/rustwide/workdir/karmaio)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> karmaio/src/driver/ops.rs:61:60
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
[INFO] [stdout]    |        ----                                                ^^^^^^^^^^^^^^^^^^ expected `Poll<<T as Completable>::Output>`, found `()`
[INFO] [stdout]    |        |
[INFO] [stdout]    |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `Poll<<T as Completable>::Output>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `karmaio` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "e20f1e4fa0012abfe5eff275448de4efd6f660704c2d73ef8cdd4b9ab001c703", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e20f1e4fa0012abfe5eff275448de4efd6f660704c2d73ef8cdd4b9ab001c703", kill_on_drop: false }`
[INFO] [stdout] e20f1e4fa0012abfe5eff275448de4efd6f660704c2d73ef8cdd4b9ab001c703
