Index: testsuite/g++.dg/cpp0x/lambda/lambda-ice7.C
===================================================================
--- testsuite/g++.dg/cpp0x/lambda/lambda-ice7.C	(revision 0)
+++ testsuite/g++.dg/cpp0x/lambda/lambda-ice7.C	(revision 0)
@@ -0,0 +1,9 @@
+// PR c++/52487
+// { dg-options "-std=c++0x" }
+
+struct A;         // { dg-error "forward declaration" }
+
+void foo(A& a)
+{
+  [=](){a;};      // { dg-error "invalid use of incomplete type" }
+}
Index: cp/semantics.c
===================================================================
--- cp/semantics.c	(revision 185571)
+++ cp/semantics.c	(working copy)
@@ -5610,8 +5610,7 @@ literal_type_p (tree t)
   if (CLASS_TYPE_P (t))
     {
       t = complete_type (t);
-      gcc_assert (COMPLETE_TYPE_P (t) || errorcount);
-      return CLASSTYPE_LITERAL_P (t);
+      return COMPLETE_TYPE_P (t) && CLASSTYPE_LITERAL_P (t);
     }
   if (TREE_CODE (t) == ARRAY_TYPE)
     return literal_type_p (strip_array_types (t));