Add debug output to test_shutil

Lib/test/test_shutil.py

@@ -156,6 +156,8 @@ class TestShutil(unittest.TestCase):
         # FUSE experienced a failure earlier in the process
         # at os.listdir.  The first failure may legally
         # be either.
+        if support.verbose:
+            print("onerror [%d]: %r" % (self.errorState, (func, arg, exc[1])))
         if 0 <= self.errorState < 2:
             if func is os.unlink:
                 self.assertIn(arg, [self.child_file_path, self.child_dir_path])