I have several instance of cases like this :
switch(c) {
case 'U', 'u' :
case 'L', 'l' :
// code . . .
}dmd from master complains about it (Error: switch case fallthrough - use 'goto case;' if intended). It used to work.
Note that in that case, the fix is trivial, but I don't really see the point in changing such behavior.
