[Python-checkins] [3.9] bpo-11105: reduce the recursion limit for tests. (GH-26605)

[isidentical]

https://github.com/python/cpython/commit/87f502231c6d5b04a4d8aa23fba24fcf5303aebb
commit: 87f502231c6d5b04a4d8aa23fba24fcf5303aebb
branch: 3.9
author: Batuhan Taskaya <batuhan at python.org>
committer: isidentical <isidentical at gmail.com>
date: 2021-06-08T20:39:47+03:00
summary:

[3.9] bpo-11105: reduce the recursion limit for tests. (GH-26605)

(cherry picked from commit e58d762c1fb4ad5e021d016c80c2bc4513632d2f)

Co-authored-by: Batuhan Taskaya <batuhan at python.org>

files:
M Lib/test/support/__init__.py
M Lib/test/test_ast.py

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index aee3737ffc4097..229e1ac0a2a22e 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -3199,3 +3199,13 @@ def skip_if_broken_multiprocessing_synchronize():
             synchronize.Lock(ctx=None)
         except OSError as exc:
             raise unittest.SkipTest(f"broken multiprocessing SemLock: {exc!r}")
+
+
+ at contextlib.contextmanager
+def infinite_recursion(max_depth=75):
+    original_depth = sys.getrecursionlimit()
+    try:
+        sys.setrecursionlimit(max_depth)
+        yield
+    finally:
+        sys.setrecursionlimit(original_depth)
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index b229921f5c07c5..c3e3be6335340b 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -1031,7 +1031,8 @@ def test_recursion_direct(self):
         e = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0)
         e.operand = e
         with self.assertRaises(RecursionError):
-            compile(ast.Expression(e), "<test>", "eval")
+            with support.infinite_recursion():
+                compile(ast.Expression(e), "<test>", "eval")
 
     def test_recursion_indirect(self):
         e = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0)
@@ -1039,7 +1040,8 @@ def test_recursion_indirect(self):
         e.operand = f
         f.operand = e
         with self.assertRaises(RecursionError):
-            compile(ast.Expression(e), "<test>", "eval")
+            with support.infinite_recursion():
+                compile(ast.Expression(e), "<test>", "eval")
 
 
 class ASTValidatorTests(unittest.TestCase):