Ensure a.mT works even if the linalg extension is disabled

Author: asmeurer

array_api_strict/_array_object.py

@@ -1159,7 +1159,7 @@ def device(self) -> Device:
     # Note: mT is new in array API spec (see matrix_transpose)
     @property
     def mT(self) -> Array:
-        from .linalg import matrix_transpose
+        from ._linear_algebra_functions import matrix_transpose
         return matrix_transpose(self)
 
     @property

array_api_strict/tests/test_flags.py

@@ -184,9 +184,10 @@ def test_boolean_indexing():
     'matrix_transpose': lambda: xp.matrix_transpose(xp.eye(3)),
     'tensordot': lambda: xp.tensordot(xp.eye(3), xp.eye(3)),
     'vecdot': lambda: xp.vecdot(xp.asarray([1, 2, 3]), xp.asarray([4, 5, 6])),
+    'mT': lambda: xp.eye(3).mT,
 }
 
-assert set(linalg_main_namespace_examples) == set(xp.__all__) & set(xp.linalg.__all__)
+assert set(linalg_main_namespace_examples) == (set(xp.__all__) & set(xp.linalg.__all__)) | {"mT"}
 
 @pytest.mark.parametrize('func_name', linalg_examples.keys())
 def test_linalg(func_name):