diff --git a/gcc/testsuite/g++.dg/cpp1z/class-deduction100.C b/gcc/testsuite/g++.dg/cpp1z/class-deduction100.C
new file mode 100644
index 00000000000..9fa307ffb77
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1z/class-deduction100.C
@@ -0,0 +1,13 @@
+// PR c++/90782
+// { dg-do compile { target c++17 } }
+
+template<class... A>
+struct bar {
+    template<class B>
+    bar(B& obj, void(B::*f)(A...)const=&B::operator()){}
+};
+int main() {
+    const auto f1 = [](){};
+    bar f8(f1);
+}
+