diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 4945fd9c912..92025a98e6b 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,9 @@
 2011-11-07  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50863
+	* parser.c (cp_parser_initializer_list): Parse C99
+	array designators tentatively.
+
 	PR c++/50870
 	* pt.c (tsubst_copy): Handle NAMESPACE_DECL.
 	(tsubst_copy_and_build) [COMPONENT_REF]: Handle a still-dependent
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index fa0117ec3e4..697be809adb 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -17580,10 +17580,13 @@ cp_parser_initializer_list (cp_parser* parser, bool* non_constant_p)
 	       && !c_dialect_objc ()
 	       && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_SQUARE))
 	{
+	  /* In C++11, [ could start a lambda-introducer.  */
+	  cp_parser_parse_tentatively (parser);
 	  cp_lexer_consume_token (parser->lexer);
 	  designator = cp_parser_constant_expression (parser, false, NULL);
 	  cp_parser_require (parser, CPP_CLOSE_SQUARE, RT_CLOSE_SQUARE);
 	  cp_parser_require (parser, CPP_EQ, RT_EQ);
+	  cp_parser_parse_definitely (parser);
 	}
       else
 	designator = NULL_TREE;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index e2eccc55680..c5f4118d2ad 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2011-11-07  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50863
+	* g++.dg/cpp0x/lambda/lambda-initlist1.C: New.
+
 	PR c++/50870
 	* g++.dg/cpp0x/decltype35.C: New.
 
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-initlist1.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-initlist1.C
new file mode 100644
index 00000000000..078ebaee183
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-initlist1.C
@@ -0,0 +1,12 @@
+// PR c++/50863
+// { dg-options -std=gnu++0x }
+
+struct T {
+  template<typename F>
+  T(F) { }
+};
+
+int main()
+{
+  T t{ []{ } };
+}