Create an Action that always fails.
Create an Action that runs some other actions in sequence and combines their results with the given function.
Convert a Future to an Action.
A simpler version of sequence that takes a number of Actions with any return type as
varargs and returns an Action that performs the individual Actions in sequence (using
andThen), returning () in the end.
Transform a TraversableOnce[Action[E, R, NoStream]] into an Action[E, TraversableOnce[R], NoStream].
Lift a constant value to an Action.