PR c++/84181 - ICE with lambda parm in template argument.

	* tree.c (strip_typedefs_expr): Use cp_tree_operand_length.

From-SVN: r257339

gcc/cp/ChangeLog

+2018-02-02  Jason Merrill  <jason@redhat.com>
+
+	PR c++/84181 - ICE with lambda parm in template argument.
+	* tree.c (strip_typedefs_expr): Use cp_tree_operand_length.
+
 2018-02-01  Jason Merrill  <jason@redhat.com>
 
 	PR c++/84160 - ICE with nested variadic capture.

gcc/cp/tree.c

@@ -1773,7 +1773,7 @@ strip_typedefs_expr (tree t, bool *remove_attributes)
 
   gcc_assert (EXPR_P (t));
 
-  n = TREE_OPERAND_LENGTH (t);
+  n = cp_tree_operand_length (t);
   ops = XALLOCAVEC (tree, n);
   type = TREE_TYPE (t);
 

gcc/testsuite/g++.dg/cpp1y/lambda-generic-targ1.C

+// PR c++/84181
+// { dg-do compile { target c++14 } }
+
+template < int ... I >
+struct A{};
+
+template < typename T >
+void f(){
+    [](auto ... i){
+        return A< decltype(i){} ... >{};
+    };
+}
+
+int main(){
+    f< int >();
+}