tests: Activate recursive_data.py test, now that io.StringIO is available.

tests/misc/recursive_data.py

@@ -0,0 +1,9 @@
+# This tests that printing recursive data structure doesn't lead to segfault.
+import _io as io
+
+l = [1, 2, 3, None]
+l[-1] = l
+try:
+    print(l, file=io.StringIO())
+except RuntimeError:
+    print("RuntimeError")

tests/misc/recursive_data.py.exp

@@ -0,0 +1 @@
+RuntimeError

tests/misc/recursive_data.py_

@@ -1,9 +0,0 @@
-# This tests that printing recursive data structure doesn't lead to segfault.
-# Unfortunately, print() so far doesn't support "file "kwarg, so variable-len
-# output of this test cannot be redirected, and this test cannot be validated.
-l = [1, 2, 3, None]
-l[-1] = l
-try:
-    print(l)
-except RuntimeError:
-    print("RuntimeError")