diff --git a/ChangeLog b/ChangeLog
index 2a007460bd..45b3c91baf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Mar 15 15:37:42 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (parser_yylex): fix warning line number.
+
 Thu Mar 15 15:19:38 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* enumerator.c (lazy_cycle): check argument number overflow before
diff --git a/parse.y b/parse.y
index 08de0046eb..ff7fb51899 100644
--- a/parse.y
+++ b/parse.y
@@ -2694,7 +2694,6 @@ primary		: literal
 		    }
 		| tLPAREN_ARG expr {lex_state = EXPR_ENDARG;} rparen
 		    {
-			rb_warning0("(...) interpreted as grouped expression");
 		    /*%%%*/
 			$$ = $2;
 		    /*%
@@ -7617,6 +7616,7 @@ parser_yylex(struct parser_params *parser)
 	}
 	else if (IS_SPCARG(-1)) {
 	    c = tLPAREN_ARG;
+	    rb_warning0("(...) interpreted as grouped expression");
 	}
 	paren_nest++;
 	COND_PUSH(0);
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 5ede83caba..6f51497cf2 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -1,4 +1,5 @@
 require 'test/unit'
+require_relative 'envutil'
 
 class TestSyntax < Test::Unit::TestCase
   def assert_valid_syntax(code, fname, mesg = fname)
@@ -8,6 +9,7 @@ class TestSyntax < Test::Unit::TestCase
     }
     code.force_encoding("us-ascii")
     verbose, $VERBOSE = $VERBOSE, nil
+    yield if defined?(yield)
     assert_nothing_raised(SyntaxError, mesg) do
       assert_equal(:ok, catch {|tag| eval(code, binding, fname, 0)}, mesg)
     end
@@ -88,6 +90,12 @@ class TestSyntax < Test::Unit::TestCase
     assert_equal({foo: 1, bar: 2}, o.kw(foo: 1, bar: 2))
   end
 
+  def test_warn_grouped_expression
+    assert_warn("test:2: warning: (...) interpreted as grouped expression\n") do
+      assert_valid_syntax("foo \\\n(\n  true)", "test") {$VERBOSE = true}
+    end
+  end
+
   private
 
   def make_tmpsrc(f, src)