DoWith returns a process that, within its execution context, delegates to the specified Doer.

ErrorChan is a convenience func that returns a chan that yields the given error.

ErrorChanf is a convenience func that returns a chan that yields an error generated from the given msg format and args.

NewErrorOnce creates an ErrorOnce that aborts blocking func calls once the given abort chan has closed.

OnError spawns a goroutine that waits for an error.

ErrorOnce an error promise.

Action is something that executes in the context of a process.

DoerFunc is an adapter func for Doer interface.