Revert r56856

* parse.y: tCHAR can be concatenated.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56863 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

parse.y

@@ -3869,10 +3869,10 @@ strings		: string
 			$$ = $1;
 		    %*/
 		    }
-		| tCHAR
 		;
 
-string		: string1
+string		: tCHAR
+		| string1
 		| string string1
 		    {
 		    /*%%%*/

test/ruby/test_literal.rb

@@ -90,6 +90,9 @@ class TestRubyLiteral < Test::Unit::TestCase
     assert_equal "\u201c", eval(%[?\\\u{201c}]), bug6069
     assert_equal "\u201c".encode("euc-jp"), eval(%[?\\\u{201c}].encode("euc-jp")), bug6069
     assert_equal "\u201c".encode("iso-8859-13"), eval(%[?\\\u{201c}].encode("iso-8859-13")), bug6069
+
+    assert_equal "ab", eval("?a 'b'")
+    assert_equal "a\nb", eval("<<A 'b'\na\nA")
   end
 
   def test_dstring