Switch labels


Consider the following:

        %switch LETTER('a':'z')
         :
        LETTER('a'):
        LETTER('e'):
        LETTER('i'):
        LETTER('o'):
        LETTER('u'):
        ! Deal with the vowels here
         :
         :
        LETTER(*):
        ! All the rest (i.e. the consonants)
         :

Instead of using a constant to specify a specific element of a switch
vector, * can be used.  It represents all the elements of the switch
vector not defined elsewhere.  Note that it does not have to come after
the specifically defined switch labels.