--- a/gcc/function-tests.c	Thu Oct 25 07:37:49 2018 +0900
+++ b/gcc/function-tests.c	Thu Feb 13 11:34:05 2020 +0900
@@ -1,5 +1,5 @@
 /* Unit tests for function-handling.
-   Copyright (C) 2015-2018 Free Software Foundation, Inc.
+   Copyright (C) 2015-2020 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -82,11 +82,11 @@
 
 /* Helper function for selftests of function-creation.  */
 
-static tree
+tree
 make_fndecl (tree return_type,
 	     const char *name,
 	     vec <tree> &param_types,
-	     bool is_variadic = false)
+	     bool is_variadic)
 {
   tree fn_type;
   if (is_variadic)
@@ -570,6 +570,19 @@
   ASSERT_EQ (SSA_NAME, TREE_CODE (gimple_return_retval (return_stmt)));
 }
 
+/* Test range folding.  We must start this here because we need cfun
+   set.  */
+
+static void
+test_ranges ()
+{
+  tree fndecl = build_trivial_high_gimple_function ();
+  function *fun = DECL_STRUCT_FUNCTION (fndecl);
+  push_cfun (fun);
+  range_tests ();
+  pop_cfun ();
+}
+
 /* Test of expansion from gimple-ssa to RTL.  */
 
 static void
@@ -674,6 +687,7 @@
   test_gimplification ();
   test_building_cfg ();
   test_conversion_to_ssa ();
+  test_ranges ();
   test_expansion_to_rtl ();
 }