I wonder if the proposal might be defined in a more generic way using some kind of a decorator function syntax.

E.g.

@asyncfunction*chainAnimationsAsync(elem,animations){varret=null;try{for(varanimofanimations){ret=yieldanim(elem);}}catch(e){/* ignore and keep going */}returnret;}

where@async is decorator function (basicallyspawn function from non-async example).