PR41427: This has apparently been fixed already, just add a regression

test.

llvm-svn: 359155

clang/test/SemaTemplate/ctad.cpp

@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -std=c++17 -verify %s
+
+// expected-no-diagnostics
+namespace pr41427 {
+  template <typename T> class A {
+  public:
+    A(void (*)(T)) {}
+  };
+  
+  void D(int) {}
+  
+  void f() {
+    A a(&D);
+    using T = decltype(a);
+    using T = A<int>;
+  }
+}