re PR c++/58597 (ICE with lambda in default argument of template function)

	PR c++/58597
	* lambda.c (maybe_add_lambda_conv_op): Check cfun rather than
	current_function_decl.

From-SVN: r220192

gcc/cp/ChangeLog

 2015-01-27  Jason Merrill  <jason@redhat.com>
 
+	PR c++/58597
+	* lambda.c (maybe_add_lambda_conv_op): Check cfun rather than
+	current_function_decl.
+
 	PR c++/63889
 	* pt.c (finish_template_variable): Move from semantics.c.
 	Handle multiple template arg levels.  Handle coercion here.

gcc/cp/lambda.c

@@ -854,7 +854,7 @@ prepare_op_call (tree fn, int nargs)
 void
 maybe_add_lambda_conv_op (tree type)
 {
-  bool nested = (current_function_decl != NULL_TREE);
+  bool nested = (cfun != NULL);
   bool nested_def = decl_function_context (TYPE_MAIN_DECL (type));
   tree callop = lambda_function (type);
 

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-defarg6.C

+// PR c++/58597
+// { dg-do compile { target c++11 } }
+
+template<typename> struct A
+{
+  template<typename T> A(T, int = []{ return 0; }()) {}
+};
+
+A<int> a = 0;