Compiler Warning (level 3) C4063

case 'identifier' is not a valid value for switch of enum 'identifier'

The specified identifier was used as a case label in a switch statement.

The following example causes this warning

enum E { a, b };
void func ( E e )
{
   switch(e)
   {
   case a:
   case b:
   case 7:      // invalid switch value
      break;    // no default label
   }
}