fix syntax in test for old Py3 versions

tests/run/constant_folding.py

@@ -109,27 +109,6 @@ def binop_bool():
     return plus1, pmix1, minus1, and1, or1, ormix1, xor1, plus3, pmix3, minus3, and3, or3, ormix3, xor3
 
 
-@cython.test_fail_if_path_exists(
-    "//ReturnStatNode//AddNode",
-)
-@cython.test_assert_path_exists(
-    "//ListNode//AddNode",
-)
-def add_strings():
-    """
-    >>> u, b, rest = add_strings()
-    >>> u == 'abcdef' or u
-    True
-    >>> b == b'abcdef' or b
-    True
-    >>> rest
-    1
-    """
-    a = ["abc" + "def"]  # not currently optimised
-    # FIXME: test encodings and unicode escapes
-    return u"abc" + u"def", b"abc" + b"def", a[0] and 1
-
-
 @cython.test_fail_if_path_exists(
     "//SliceIndexNode",
 )

tests/run/constant_folding_cy.pyx

@@ -98,3 +98,24 @@ def for_in_empty_setcomp():
     0
     """
     return {i for i in []}
+
+
+@cython.test_fail_if_path_exists(
+    "//ReturnStatNode//AddNode",
+)
+@cython.test_assert_path_exists(
+    "//ListNode//AddNode",
+)
+def add_strings():
+    """
+    >>> u, b, rest = add_strings()
+    >>> u == 'abcdef' or u
+    True
+    >>> b == b'abcdef' or b
+    True
+    >>> rest
+    1
+    """
+    a = ["abc" + "def"]  # not currently optimised
+    # FIXME: test encodings and unicode escapes
+    return u"abc" + u"def", b"abc" + b"def", a[0] and 1