PR c++/80465 - ICE with generic lambda with noexcept-specifier.

	* lambda.c (maybe_add_lambda_conv_op): Keep processing_template_decl
	set longer for a generic lambda.

From-SVN: r249322

gcc/cp/ChangeLog

 2017-06-16  Jason Merrill  <jason@redhat.com>
 
+	PR c++/80465 - ICE with generic lambda with noexcept-specifier.
+	* lambda.c (maybe_add_lambda_conv_op): Keep processing_template_decl
+	set longer for a generic lambda.
+
 	PR c++/80614 - Wrong mangling for C++17 noexcept type
 	* mangle.c (write_type): Put the eh spec back on the function type.
 

gcc/cp/lambda.c

@@ -987,6 +987,8 @@ maybe_add_lambda_conv_op (tree type)
 			    null_pointer_node);
   if (generic_lambda_p)
     {
+      ++processing_template_decl;
+
       /* Prepare the dependent member call for the static member function
 	 '_FUN' and, potentially, prepare another call to be used in a decltype
 	 return expression for a deduced return call op to allow for simple
@@ -1036,9 +1038,7 @@ maybe_add_lambda_conv_op (tree type)
 
 	if (generic_lambda_p)
 	  {
-	    ++processing_template_decl;
 	    tree a = forward_parm (tgt);
-	    --processing_template_decl;
 
 	    CALL_EXPR_ARG (call, ix) = a;
 	    if (decltype_call)
@@ -1062,11 +1062,9 @@ maybe_add_lambda_conv_op (tree type)
     {
       if (decltype_call)
 	{
-	  ++processing_template_decl;
 	  fn_result = finish_decltype_type
 	    (decltype_call, /*id_expression_or_member_access_p=*/false,
 	     tf_warning_or_error);
-	  --processing_template_decl;
 	}
     }
   else
@@ -1084,6 +1082,9 @@ maybe_add_lambda_conv_op (tree type)
       && TYPE_NOTHROW_P (TREE_TYPE (callop)))
     stattype = build_exception_variant (stattype, noexcept_true_spec);
 
+  if (generic_lambda_p)
+    --processing_template_decl;
+
   /* First build up the conversion op.  */
 
   tree rettype = build_pointer_type (stattype);

gcc/testsuite/g++.dg/cpp1z/noexcept-type17.C

+// PR c++/80465
+// { dg-options -std=c++1z }
+
+int foo(...);
+int main() {
+  [](auto a) noexcept(noexcept(foo(a))){}(42);
+}