bpo-38006: Avoid closure in weakref.WeakValueDictionary (GH-15641)

weakref.WeakValueDictionary defines a local remove() function used as
callback for weak references. This function was created with a
closure.  Modify the implementation to avoid the closure.

3 files changed, 10 insertions, 2 deletions

diff --git a/Lib/test/test_weakref.py b/Lib/test/test_weakref.py
index 41f78e7..e14df9e 100644
--- a/Lib/test/test_weakref.py
+++ b/Lib/test/test_weakref.py
@@ -1792,6 +1792,11 @@ class MappingTestCase(TestBase):
         # copying should not result in a crash.
         self.check_threaded_weak_dict_copy(weakref.WeakValueDictionary, True)
 
+    @support.cpython_only
+    def test_remove_closure(self):
+        d = weakref.WeakValueDictionary()
+        self.assertIsNone(d._remove.__closure__)
+
 
 from test import mapping_tests
 
diff --git a/Lib/weakref.py b/Lib/weakref.py
index 560deee..d17b3ed 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -108,12 +108,12 @@ class WeakValueDictionary(_collections_abc.MutableMapping):
                 else:
                     # Atomic removal is necessary since this function
                     # can be called asynchronously by the GC
-                    _atomic_removal(d, wr.key)
+                    _atomic_removal(self.data, wr.key)
         self._remove = remove
         # A list of keys to be removed
         self._pending_removals = []
         self._iterating = set()
-        self.data = d = {}
+        self.data = {}
         self.update(other, **kw)
 
     def _commit_removals(self):
diff --git a/Misc/NEWS.d/next/Library/2019-09-02-13-37-27.bpo-38006.Y7vA0Q.rst b/Misc/NEWS.d/next/Library/2019-09-02-13-37-27.bpo-38006.Y7vA0Q.rst
new file mode 100644
index 0000000..ff064ad
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-09-02-13-37-27.bpo-38006.Y7vA0Q.rst
@@ -0,0 +1,3 @@
+weakref.WeakValueDictionary defines a local remove() function used as
+callback for weak references. This function was created with a closure.
+Modify the implementation to avoid the closure.