tweak comment

runtime/Java/src/org/antlr/v4/runtime/IntStream.java

@@ -30,9 +30,6 @@ package org.antlr.v4.runtime;
 
 /** A simple stream of integers used when all I care about is the char
  *  or token type sequence (such as interpretation).
- *
- *  Do like Java IO and have new BufferedStream(new TokenStream) rather than
- *  using inheritance?
  */
 public interface IntStream {
 	void consume();

tool/playground/T.g

@@ -1,6 +1,7 @@
 grammar T;
 
 s : A | B ;
-x : (A|B);
-A : 'a'|'c';
-B : 'b' ;
+
+e : e '+' e
+  | INT
+  ;