pub fn install_spawner(
spawn: impl Fn(Pin<Box<dyn Future<Output = ()>>>) -> Box<dyn FnOnce()> + 'static,
)Expand description
Install the async-spawn door: spawn runs a future on the app’s main-loop executor and
returns an ABORT closure (remove + drop the future). The abort MUST be a no-op once the
task has completed — Resource stores it after an eager first poll, so a synchronously
ready future has already finished by then. day-core’s launch_with wires this to
day::task / TaskHandle::abort; call it once at startup (docs/async.md).