How to do a checked cast from base-type to enum-type

[dnspies]

Is there a way to do a checked cast from a base type to an 
enum-type (so that an exception is thrown if it fails)?

ie something like

enum x : dchar { A : 'a', B : 'b', C : 'c' };

x get_x() {
  dchar r = get_char();
  return cast(x)r; //Throw exception if this cast fails
}