--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Modules/Inputs/PR31469/textual.h	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,17 @@
+namespace A {
+inline
+namespace __1 {
+  template <class _Tp> class allocator;
+  template <class _Tp, class _Alloc = allocator<_Tp>> class list;
+  template <class _VoidPtr> class __list_iterator {
+    //template <class> friend class list; // causes another crash in ASTDeclReader::attachPreviousDecl
+    template <class, class> friend class list;
+  };
+  template <class _Tp, class _Alloc> class __list_imp {};
+  template <class _Tp, class _Alloc> class list : __list_imp<_Tp, _Alloc> {
+  public:
+    list() {}
+  };
+  template <class _Tp> void f(list<_Tp>);
+}
+}