_auto_called cleanup (GH-22285)

Author: ethanfurman

Lib/enum.py

@@ -105,9 +105,9 @@ def __setitem__(self, key, value):
                 # enum overwriting a descriptor?
                 raise TypeError('%r already defined as: %r' % (key, self[key]))
             if isinstance(value, auto):
-                self._auto_called = True
                 if value.value == _auto_null:
                     value.value = self._generate_next_value(key, 1, len(self._member_names), self._last_values[:])
+                    self._auto_called = True
                 value = value.value
             self._member_names.append(key)
             self._last_values.append(value)

Lib/test/test_enum.py

@@ -1837,6 +1837,17 @@ class Color(Enum):
                 def _generate_next_value_(name, start, count, last):
                     return name
 
+    def test_auto_order_wierd(self):
+        weird_auto = auto()
+        weird_auto.value = 'pathological case'
+        class Color(Enum):
+            red = weird_auto
+            def _generate_next_value_(name, start, count, last):
+                return name
+            blue = auto()
+        self.assertEqual(list(Color), [Color.red, Color.blue])
+        self.assertEqual(Color.red.value, 'pathological case')
+        self.assertEqual(Color.blue.value, 'blue')
 
     def test_duplicate_auto(self):
         class Dupes(Enum):