c++: Add test for c++/91104

Fixed by r271705.

gcc/testsuite/ChangeLog:

	PR c++/91104
	* g++.dg/cpp1y/lambda-generic-variadic21.C: New test.

diff --git a/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic21.C b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic21.C
new file mode 100644 (file)
index 0000000..affb1ff
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic21.C
@@ -0,0 +1,26 @@
+// PR c++/91104
+// { dg-do run { target c++14 } }
+
+void
+test (void (*f)(int, int, int))
+{
+  f(1, 2, 3);
+}
+
+void
+check (int a, int b, int c)
+{
+  if (a != 1 || b != 2 || c != 3)
+    __builtin_abort ();
+}
+
+int
+main ()
+{
+  test ([](auto... args) {
+    check (args...);
+  });
+  test ([](int a, int b, int c) {
+    check (a, b, c);
+  });
+}