Copy builtin functions as atomic. Fixes #746304. Will backport to 2.2.
diff --git a/Lib/copy.py b/Lib/copy.py
index 02aa46b..31adfd3 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -120,6 +120,7 @@
d[types.TypeType] = _copy_atomic
d[types.XRangeType] = _copy_atomic
d[types.ClassType] = _copy_atomic
+d[types.BuiltinFunctionType] = _copy_atomic
def _copy_list(x):
return x[:]
@@ -233,6 +234,7 @@
d[types.TypeType] = _deepcopy_atomic
d[types.XRangeType] = _deepcopy_atomic
d[types.ClassType] = _deepcopy_atomic
+d[types.BuiltinFunctionType] = _deepcopy_atomic
def _deepcopy_list(x, memo):
y = []