[Issue 5714] New: case ranges in final switches

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5714

           Summary: case ranges in final switches
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2011-03-07 04:31:23 PST ---
This is a low-priority enhancement suggestion.

If the type to final-switch on has a natural ordering (so it's not an enum!),
like a char/ubyte/byte, then in some situations I'd like to use the range
syntax:


void main() {
     ubyte u;
     final switch (u) {
         case   0: .. case 100: break;
         case 101: .. case 255: break;
     }
}


Currently DMD 2.052 gives the errors:
test.d(4): Error: case ranges not allowed in final switch
test.d(5): Error: case ranges not allowed in final switch


See also bug 5713

If case ranges are not allowed on full-range int values, then you can't use
them in a final switch.

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