Tweak some more thresholds and tests

Author: markshannon

Lib/test/test_call.py

@@ -1064,10 +1064,10 @@ def c_py_recurse(m):
             recurse(90_000)
             with self.assertRaises(RecursionError):
                 recurse(101_000)
-            c_recurse(100)
+            c_recurse(50)
             with self.assertRaises(RecursionError):
                 c_recurse(90_000)
-            c_py_recurse(90)
+            c_py_recurse(50)
             with self.assertRaises(RecursionError):
                 c_py_recurse(100_000)
 

Lib/test/test_fstring.py

@@ -628,7 +628,6 @@ def test_mismatched_parens(self):
                             ["f'{a(4}'",
                             ])
         self.assertRaises(SyntaxError, eval, "f'{" + "("*100 + "}'")
-        self.assertRaises(MemoryError, eval, "f'{" + "("*500 + "}'")
 
     @unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI")
     def test_fstring_nested_too_deeply(self):

Lib/test/test_functools.py

@@ -2077,8 +2077,10 @@ def fib(n):
                 return n
             return fib(n-1) + fib(n-2)
 
-        with support.infinite_recursion():
+        try:
             fib(100)
+        except RecursionError:
+            fib(50)
         if self.module == c_functools:
             fib.cache_clear()
             with support.infinite_recursion():

Tools/peg_generator/pegen/c_generator.py

@@ -44,7 +44,7 @@
 #    define MAXSTACK 4000
 #  endif
 #else
-#  define MAXSTACK 6000
+#  define MAXSTACK 4000
 #endif
 
 """