Avoid treating ellipsis as a dot delimiter

black.py

@@ -1741,7 +1741,7 @@ def is_split_before_delimiter(leaf: Leaf, previous: Leaf = None) -> int:
         leaf.type == token.DOT
         and leaf.parent
         and leaf.parent.type not in {syms.import_from, syms.dotted_name}
-        and (previous is None or previous.type != token.NAME)
+        and (previous is None or previous.type in CLOSING_BRACKETS)
     ):
         return DOT_PRIORITY
 

tests/comments2.py

@@ -23,6 +23,25 @@
     'Generator',
 ]
 
+not_shareables = [
+    # singletons
+    True,
+    False,
+    NotImplemented, ...,
+    # builtin types and objects
+    type,
+    object,
+    object(),
+    Exception(),
+    42,
+    100.0,
+    "spam",
+    # user-defined types and objects
+    Cheese,
+    Cheese("Wensleydale"),
+    SubBytes(b"spam"),
+]
+
 if 'PYTHON' in os.environ:
     add_compiler(compiler_from_env())
 else:
@@ -152,6 +171,26 @@ def inline_comments_in_brackets_ruin_everything():
     "Generator",
 ]
 
+not_shareables = [
+    # singletons
+    True,
+    False,
+    NotImplemented,
+    ...,
+    # builtin types and objects
+    type,
+    object,
+    object(),
+    Exception(),
+    42,
+    100.0,
+    "spam",
+    # user-defined types and objects
+    Cheese,
+    Cheese("Wensleydale"),
+    SubBytes(b"spam"),
+]
+
 if "PYTHON" in os.environ:
     add_compiler(compiler_from_env())
 else: