From 17014e45864cefd37660b054fb71fa2e177690ef Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Fri, 1 May 2020 02:34:22 +0200
Subject: [PATCH] Remove dead code in test__xxsubinterpreters (GH-19826)

---
 Lib/test/test__xxsubinterpreters.py | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/Lib/test/test__xxsubinterpreters.py b/Lib/test/test__xxsubinterpreters.py
index 44f4d3fa0f4..80eff19152f 100644
--- a/Lib/test/test__xxsubinterpreters.py
+++ b/Lib/test/test__xxsubinterpreters.py
@@ -19,12 +19,6 @@ interpreters = support.import_module('_xxsubinterpreters')
 ##################################
 # helpers
 
-def powerset(*sets):
-    return itertools.chain.from_iterable(
-        combinations(sets, r)
-        for r in range(len(sets)+1))
-
-
 def _captured_script(script):
     r, w = os.pipe()
     indented = script.replace('\n', '\n                ')
@@ -90,14 +84,6 @@ def _run_interp(id, source, shared, _mainns={}):
         interpreters.run_string(id, source, shared)
 
 
-def run_interp_threaded(id, source, **shared):
-    def run():
-        _run(id, source, shared)
-    t = threading.Thread(target=run)
-    t.start()
-    t.join()
-
-
 class Interpreter(namedtuple('Interpreter', 'name id')):
 
     @classmethod
@@ -786,12 +772,6 @@ class RunStringTests(TestBase):
             self._fs.close()
         super().tearDown()
 
-    @property
-    def fs(self):
-        if self._fs is None:
-            self._fs = FSFixture(self)
-        return self._fs
-
     def test_success(self):
         script, file = _captured_script('print("it worked!", end="")')
         with file: