Issue #5392: when a very low recursion limit was set, the interpreter would
abort with a fatal error after the recursion limit was hit twice.
diff --git a/Include/ceval.h b/Include/ceval.h
index 919c494..7bd8179 100644
--- a/Include/ceval.h
+++ b/Include/ceval.h
@@ -92,11 +92,10 @@
# define _Py_MakeRecCheck(x) (++(x) > _Py_CheckRecursionLimit)
#endif
-#ifdef USE_STACKCHECK
-# define _Py_MakeEndRecCheck(x) (--(x) < _Py_CheckRecursionLimit - 50)
-#else
-# define _Py_MakeEndRecCheck(x) (--(x) < _Py_CheckRecursionLimit - 50)
-#endif
+#define _Py_MakeEndRecCheck(x) \
+ (--(x) < ((_Py_CheckRecursionLimit > 100) \
+ ? (_Py_CheckRecursionLimit - 50) \
+ : (3 * (_Py_CheckRecursionLimit >> 2))))
#define Py_ALLOW_RECURSION \
do { unsigned char _old = PyThreadState_GET()->recursion_critical;\