PR c++/86200 - ICE with unexpanded pack in lambda parameter.

	* pt.c (find_parameter_packs_r) [LAMBDA_EXPR]: Also look into the
	function type.

From-SVN: r261726

gcc/cp/ChangeLog

 2018-06-18  Jason Merrill  <jason@redhat.com>
 
+	PR c++/86200 - ICE with unexpanded pack in lambda parameter.
+	* pt.c (find_parameter_packs_r) [LAMBDA_EXPR]: Also look into the
+	function type.
+
 	PR c++/81060 - ICE with unexpanded parameter pack.
 	* pt.c (check_for_bare_parameter_packs): Add loc parameter.
 	* decl.c (grokdeclarator): Call it for qualifying_scope.

gcc/cp/pt.c

@@ -3839,8 +3839,10 @@ find_parameter_packs_r (tree *tp, int *walk_subtrees, void* data)
 	     cap; cap = TREE_CHAIN (cap))
 	  cp_walk_tree (&TREE_VALUE (cap), &find_parameter_packs_r, ppd,
 			ppd->visited);
-	/* Since we defer implicit capture, look in the body as well.  */
+	/* Since we defer implicit capture, look in the parms and body.  */
 	tree fn = lambda_function (t);
+	cp_walk_tree (&TREE_TYPE (fn), &find_parameter_packs_r, ppd,
+		      ppd->visited);
 	cp_walk_tree (&DECL_SAVED_TREE (fn), &find_parameter_packs_r, ppd,
 		      ppd->visited);
 	*walk_subtrees = 0;

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-variadic7.C

+// PR c++/86200
+// { dg-do compile { target c++11 } }
+
+template<typename ... Args>
+static void foo()
+{
+  [](Args, int x) {
+    x;
+  };				// { dg-error "packs not expanded" }
+}
+int main()
+{
+  foo();
+}