--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp1z/pr87814.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,26 @@
+// { dg-do compile { target c++17 } }
+
+template<class Element>
+struct box {
+    template<class E>
+    constexpr box(E && e)
+        noexcept(noexcept(Element(e)))
+    {}
+};
+
+template<class... Ts>
+struct compressed_tuple_ : box<Ts> ... {
+    template<typename... Args>
+    constexpr compressed_tuple_(Args &&... args)
+        noexcept((noexcept(box<Ts>(args)) && ...))
+      : box<Ts>(args)...
+    {}
+};
+
+struct adaptor_cursor : compressed_tuple_<int*> {
+    using compressed_tuple_::compressed_tuple_;
+};
+
+int main() {
+    (void)noexcept(adaptor_cursor{(int*)0});
+}