commit 5656f70c3b34354e29de75db6dad0a0b44ef6f04
Author: Jason Merrill <jason@redhat.com>
Date:   Fri May 27 12:05:59 2011 -0400

    	PR c++/47687
    	* pt.c (dependent_type_p_r): Avoid infinite recursion.

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 71fe0a0..ae3d83d 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -18260,8 +18260,15 @@ dependent_type_p_r (tree type)
   scope = TYPE_CONTEXT (type);
   if (scope && TYPE_P (scope))
     return dependent_type_p (scope);
-  else if (scope && TREE_CODE (scope) == FUNCTION_DECL)
-    return type_dependent_expression_p (scope);
+  /* Don't use type_dependent_expression_p here, as it can lead
+     to infinite recursion trying to determine whether a lambda
+     nested in a lambda is dependent (c++/47687).  */
+  else if (scope && TREE_CODE (scope) == FUNCTION_DECL
+	   && DECL_LANG_SPECIFIC (scope)
+	   && DECL_TEMPLATE_INFO (scope)
+	   && (any_dependent_template_arguments_p
+	       (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (scope)))))
+    return true;
 
   /* Other types are non-dependent.  */
   return false;
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-nested4.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-nested4.C
new file mode 100644
index 0000000..a5bd1a2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-nested4.C
@@ -0,0 +1,9 @@
+// PR c++/47687
+// { dg-options -std=c++0x }
+
+template <class T> struct A { };
+
+auto inl = []{ return []{}; }();
+typedef decltype(inl) inlt;
+
+A<inlt> a;