Index: parser.c
===================================================================
--- parser.c    (revision 164989)
+++ parser.c    (working copy)
@@ -21482,7 +21491,12 @@ cp_parser_objc_method_keyword_params (cp_parser* p
        }
 
       maybe_unary_selector_p = false;
-      cp_parser_require (parser, CPP_COLON, RT_COLON);
+      if (!cp_parser_require (parser, CPP_COLON, RT_COLON))
+       {
+         /* Something went quite wrong.  There should be a colon
+            here, but there is not.  Stop parsing parameters.  */
+         break;
+       }
       type_name = cp_parser_objc_typename (parser);
       /* New ObjC allows attributes on parameters too.  */
       if (cp_lexer_next_token_is_keyword (parser->lexer, RID_ATTRIBUTE))

Index: obj-c++.dg/syntax-error-9.mm
===================================================================
--- obj-c++.dg/syntax-error-9.mm        (revision 0)
+++ obj-c++.dg/syntax-error-9.mm        (revision 0)
@@ -0,0 +1,3 @@
+@implementation SaturnDoc /* { dg-warning "cannot find interface declaration" } */
+- read: (void*)aStream ggg /* { dg-error "expected .:. at end of input" } */
+/* { dg-error "expected ..end. at end of input" "" { target *-*-* } 2 } */