MAINT: remove `NUMPY_EXPERIMENTAL_ARRAY_FUNCTION` env var

As discussed in
https://mail.python.org/archives/list/numpy-discussion@python.org/thread/UKZJACAP5FUG7KP2AQDPE4P5ADNWLOHZ/

This flag was always meant to be temporary, and cleaning it up is
long overdue.

1 files changed, 2 insertions, 9 deletions

diff --git a/numpy/lib/tests/test_twodim_base.py b/numpy/lib/tests/test_twodim_base.py
index 141f508fd..eb008c600 100644
--- a/numpy/lib/tests/test_twodim_base.py
+++ b/numpy/lib/tests/test_twodim_base.py
@@ -4,20 +4,14 @@
 from numpy.testing import (
     assert_equal, assert_array_equal, assert_array_max_ulp,
     assert_array_almost_equal, assert_raises, assert_
-    )
-
+)
 from numpy import (
     arange, add, fliplr, flipud, zeros, ones, eye, array, diag, histogram2d,
     tri, mask_indices, triu_indices, triu_indices_from, tril_indices,
     tril_indices_from, vander,
-    )
-
+)
 import numpy as np
 
-
-from numpy.core.tests.test_overrides import requires_array_function
-
-
 import pytest
 
 
@@ -283,7 +277,6 @@ class TestHistogram2d:
         assert_array_equal(H, answer)
         assert_array_equal(xe, array([0., 0.25, 0.5, 0.75, 1]))
 
-    @requires_array_function
     def test_dispatch(self):
         class ShouldDispatch:
             def __array_function__(self, function, types, args, kwargs):