parse.y: empty paren

* parse.y (primary): empty parentheses at cmdarg can be null.
  [ruby-core:68477] [Bug #10957]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49964 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sat Mar 14 02:14:50 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (primary): empty parentheses at cmdarg can be null.
+	  [ruby-core:68477] [Bug #10957]
+
 Fri Mar 13 15:04:36 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/stringio/stringio.c (strio_close): don't raise on dobule

parse.y

@@ -2102,7 +2102,7 @@ arg		: lhs '=' arg
 			value_expr($1);
 			value_expr($3);
 			$$ = NEW_DOT2($1, $3);
-			if (nd_type($1) == NODE_LIT && FIXNUM_P($1->nd_lit) &&
+			if ($1 && nd_type($1) == NODE_LIT && FIXNUM_P($1->nd_lit) &&
 			    nd_type($3) == NODE_LIT && FIXNUM_P($3->nd_lit)) {
 			    deferred_nodes = list_append(deferred_nodes, $$);
 			}
@@ -2116,7 +2116,7 @@ arg		: lhs '=' arg
 			value_expr($1);
 			value_expr($3);
 			$$ = NEW_DOT3($1, $3);
-			if (nd_type($1) == NODE_LIT && FIXNUM_P($1->nd_lit) &&
+			if ($1 && nd_type($1) == NODE_LIT && FIXNUM_P($1->nd_lit) &&
 			    nd_type($3) == NODE_LIT && FIXNUM_P($3->nd_lit)) {
 			    deferred_nodes = list_append(deferred_nodes, $$);
 			}

test/ruby/test_syntax.rb

@@ -557,6 +557,12 @@ eom
     assert_syntax_error(src, /formal argument/, bug10545)
   end
 
+  def test_null_range_cmdarg
+    bug10957 = '[ruby-core:68477] [Bug #10957]'
+    assert_ruby_status(['-c', '-e', 'p ()..0'], "", bug10957)
+    assert_ruby_status(['-c', '-e', 'p ()...0'], "", bug10957)
+  end
+
   private
 
   def not_label(x) @result = x; @not_label ||= nil end