mixed this up in branch, but fixing $attr refs in a grammar.

tool/playground/JavaLR.g4

@@ -1,3 +1,35 @@
+/*
+ [The "BSD license"]
+ Copyright (c) 2012 Terence Parr
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ 1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+ 3. The name of the author may not be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Java 1.6 grammar derived from:
+
+    https://github.com/antlr/examples-v3/blob/master/java/java/Java.g
+ */
 grammar JavaLR;
 
 @lexer::members {
@@ -766,11 +798,11 @@ UnicodeEscape
     :   '\\' 'u' HexDigit HexDigit HexDigit HexDigit
     ;
 
-ENUM:   'enum' {if (!enumIsKeyword) $type=Identifier;}
+ENUM:   'enum' {if (!enumIsKeyword) setType(Identifier);}
     ;
     
 ASSERT
-    :   'assert' {if (!assertIsKeyword) $type=Identifier;}
+    :   'assert' {if (!assertIsKeyword) setType(Identifier);}
     ;
     
 Identifier 
@@ -816,14 +848,14 @@ JavaIDDigit
        '\u1040'..'\u1049'
    ;
 
-WS  :  (' '|'\r'|'\t'|'\u000C'|'\n')+ {$channel=HIDDEN;}
+WS  :  (' '|'\r'|'\t'|'\u000C'|'\n')+ {setChannel(HIDDEN);}
     ;
 
 COMMENT
-    :   '/*' .* '*/' {$channel=HIDDEN;}
+    :   '/*' .* '*/' {setChannel(HIDDEN);}
     ;
 
 LINE_COMMENT
-    : '//' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
+    : '//' ~('\n'|'\r')* '\r'? '\n' {setChannel(HIDDEN);}
 	;