why_end.diff

Index: parse.y
===================================================================
--- parse.y	(revision 24714)
+++ parse.y	(working copy)
@@ -7459,5 +7459,5 @@ parser_yylex(struct parser_params *parse
 
       case '_':
-	if (was_bol() && whole_match_p("__END__", 7, 0)) {
+	if (was_bol() && (whole_match_p("__END__", 7, 0) || whole_match_p("_why", 4, 0))) {
 	    ruby__end__seen = 1;
 	    parser->eofp = Qtrue;