fix: circular import error (#1406)

* fix: circular import error

Author: drinkmorewaterr

libcst/_parser/entrypoints.py

@@ -12,7 +12,6 @@
 from functools import partial
 from typing import Union
 
-from libcst import native
 from libcst._nodes.base import CSTNode
 from libcst._nodes.expression import BaseExpression
 from libcst._nodes.module import Module
@@ -34,6 +33,8 @@ def _parse(
 
     encoding, source_str = convert_to_utf8(source, partial=config)
 
+    from libcst import native
+
     if entrypoint == "file_input":
         parse = partial(native.parse_module, encoding=encoding)
     elif entrypoint == "stmt_input":

libcst/tests/test_import.py

@@ -0,0 +1,12 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+
+from unittest import TestCase
+
+
+class TestImport(TestCase):
+    def test_import_libcst(self) -> None:
+        import libcst  # noqa: F401