gh-93464: [Enum] fix auto() failure during multiple assignment (GH-99148)

* fix auto() failure during multiple assignment

i.e. `ONE = auto(), 'text'` will now have `ONE' with the value of `(1,
'text')`.  Before it would have been `(<an auto instance>, 'text')`

1 files changed, 25 insertions, 8 deletions

diff --git a/Lib/enum.py b/Lib/enum.py
index a66c344..c1ccf53 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -171,7 +171,8 @@ class auto:
     """
     Instances are replaced with an appropriate value in Enum class suites.
     """
-    value = _auto_null
+    def __init__(self, value=_auto_null):
+        self.value = value
 
     def __repr__(self):
         return "auto(%r)" % self.value
@@ -427,15 +428,31 @@ class _EnumDict(dict):
             elif isinstance(value, member):
                 # unwrap value here -- it will become a member
                 value = value.value
+            non_auto_store = True
+            single = False
             if isinstance(value, auto):
-                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
+                single = True
+                value = (value, )
+            if isinstance(value, tuple):
+                auto_valued = []
+                for v in value:
+                    if isinstance(v, auto):
+                        non_auto_store = False
+                        if v.value == _auto_null:
+                            v.value = self._generate_next_value(
+                                    key, 1, len(self._member_names), self._last_values[:],
+                                    )
+                            self._auto_called = True
+                        v = v.value
+                        self._last_values.append(v)
+                    auto_valued.append(v)
+                if single:
+                    value = auto_valued[0]
+                else:
+                    value = tuple(auto_valued)
             self._member_names[key] = None
-            self._last_values.append(value)
+            if non_auto_store:
+                self._last_values.append(value)
         super().__setitem__(key, value)
 
     def update(self, members, **more_members):