No type comments on AsyncWith/AsyncFor? #27

From Python.asdl in ast35:

For(expr target, expr iter, stmt* body, stmt* orelse, string? type_comment)
With(withitem* items, stmt* body, string? type_comment)
but
AsyncFor(expr target, expr iter, stmt* body, stmt* orelse)
AsyncWith(withitem* items, stmt* body)

I don't believe there's anything against using type comments in async withs/fors, and this limits how MyPy can analyze them.