From 7b3d52a909ee78a0609635e97a92ebd8f6f2ebc9 Mon Sep 17 00:00:00 2001
From: hauntsaninja <>
Date: Sat, 21 Nov 2020 23:42:45 -0800
Subject: [PATCH] actually inherit from FileSystemCache to appease mypyc

This means we could accidentally fallback to calling a FileSystemCache
method if stuff gets moved around.
---
 mypy/test/test_find_sources.py | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mypy/test/test_find_sources.py b/mypy/test/test_find_sources.py
index 2b6b0178c32ed..8d16fcf925e51 100644
--- a/mypy/test/test_find_sources.py
+++ b/mypy/test/test_find_sources.py
@@ -1,13 +1,14 @@
 from mypy.modulefinder import BuildSource
 import os
-from typing import Any, List, Optional, Set, Tuple, cast
+from typing import List, Optional, Set, Tuple
 from unittest import TestCase
 from mypy.find_sources import SourceFinder
+from mypy.fscache import FileSystemCache
 from mypy.modulefinder import BuildSource
 from mypy.options import Options
 
 
-class _FakeFSCache:
+class FakeFSCache(FileSystemCache):
     def __init__(self, files: Set[str]) -> None:
         assert all(os.path.isabs(f) for f in files)
         self.files = files
@@ -29,9 +30,6 @@ def init_under_package_root(self, file: str) -> bool:
         return False
 
 
-FakeFSCache = cast(Any, _FakeFSCache)
-
-
 def normalise_build_source_list(sources: List[BuildSource]) -> List[Tuple[str, Optional[str]]]:
     return sorted((s.module, s.base_dir) for s in sources)