fix reversed order of operands in constant calculation for 'in' and 'not in' operator

Cython/Compiler/ExprNodes.py

@@ -8219,9 +8219,6 @@ class TypeofNode(ExprNode):
 #
 #-------------------------------------------------------------------
 
-def _not_in(x, seq):
-    return x not in seq
-
 compile_time_binary_operators = {
     '<': operator.lt,
     '<=': operator.le,
@@ -8243,8 +8240,8 @@ compile_time_binary_operators = {
     '>>': operator.rshift,
     '-': operator.sub,
     '^': operator.xor,
-    'in': operator.contains,
-    'not_in': _not_in,
+    'in': lambda x, seq: x in seq,
+    'not_in': lambda x, seq: x not in seq,
 }
 
 def get_compile_time_binop(node):

tests/run/constant_folding.py

@@ -131,3 +131,15 @@ def str_slicing2():
     str3 = 'abc\xE9def'[2:4]
 
     return str0, str1, str2, str3
+
+
+@cython.test_fail_if_path_exists(
+    "//IfStatNode",
+)
+def str_in_and_not_in():
+    """
+    >>> str_in_and_not_in()
+    True
+    """
+    if 'a' in 'abc' and 'b' in 'abc' and 'c' in 'abc' and 'd' not in 'abc': return True
+    else: return False