nobu	2015-01-29 22:22:45 +0900 (Thu, 29 Jan 2015)

  New Revision: 49439

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=49439

  Log:
    parse.y: no optimization in defined?
    
    * parse.y (logop_gen): no needs for optimization in defined?
      operator.  literal conditions are optimized away eventually.

  Modified files:
    trunk/parse.y
Index: parse.y
===================================================================
--- parse.y	(revision 49438)
+++ parse.y	(revision 49439)
@@ -9678,7 +9678,7 @@ logop_gen(struct parser_params *parser, https://github.com/ruby/ruby/blob/trunk/parse.y#L9678
 {
     value_expr(left);
     if (!left) {
-	if (type == NODE_AND) return 0;
+	if (!in_defined && type == NODE_AND) return 0;
 	/* make NODE_OR not to be "void value expression" */
     }
     else if ((enum node_type)nd_type(left) == type) {
@@ -9689,7 +9689,7 @@ logop_gen(struct parser_params *parser, https://github.com/ruby/ruby/blob/trunk/parse.y#L9689
 	node->nd_2nd = NEW_NODE(type, second, right, 0);
 	return left;
     }
-    else {
+    else if (!in_defined) {
 	switch (nd_type(left)) {
 	  case NODE_NIL:
 	  case NODE_FALSE:

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