Fix omission of bools from grammar.

dvanhorn · dvanhorn · commit d6eff2a2662a · 2019-09-24T17:11:39.000-04:00
diff --git a/www/assignments/4.scrbl b/www/assignments/4.scrbl
@@ -213,6 +213,7 @@ grammar:
 @verbatim{
 <expr> ::= integer
         |  character
+        |  boolean
 	|  variable
         |  ( <compound> )
 	|  [ <compound> ]
