For strict channel priority in CI

.github/workflows/ci.yaml

@@ -33,6 +33,7 @@ jobs:
           miniforge-variant: Mambaforge
           miniforge-version: latest
           use-mamba: true
+          channel-priority: strict
           python-version: ${{ matrix.python-version }}
           activate-environment: test-environment
           environment-file: continuous_integration/environment.yaml

cython_test.pyx

@@ -0,0 +1,17 @@
+# cython: language_level=3, boundscheck=False, cdivision=True, wraparound=False, initializedcheck=False, nonecheck=False
+cimport cython
+import numpy as np
+cimport numpy as np
+
+np.import_array()
+
+def test_func():
+    cdef np.ndarray[float, ndim=2] arr = np.zeros((5, 5), dtype=np.float32)
+    cdef float[:, ::1] arr_view = arr
+    _run(arr_view)
+
+cdef void _run(float[:, ::1] arr_view) noexcept nogil:
+    cdef float[:, :] tmp = _get_upper_left_corner(arr_view)
+
+cdef inline float[:, :] _get_upper_left_corner(float[:, ::1] arr) noexcept nogil:
+    return arr[:1, :1]

cython_test2.pyx

@@ -0,0 +1,34 @@
+# cython: language_level=3, boundscheck=False, cdivision=True, wraparound=False, initializedcheck=False, nonecheck=False
+cimport cython
+import numpy as np
+cimport numpy as np
+
+np.import_array()
+
+def test_func():
+    cdef np.ndarray[float, ndim=2] arr = np.zeros((5, 5), dtype=np.float32)
+    cdef float[:, ::1] arr_view = arr
+    t = Test(5.0)
+    t.call_me(arr_view)
+
+
+cdef class Test:
+
+    cdef float _a
+
+    def __cinit__(self, float a):
+        self._a = a
+
+    cdef void call_me(self, float[:, ::1] my_arr) noexcept:
+        with nogil:
+            self._call_me(my_arr)
+
+    cdef void _call_me(self, float[:, ::1] my_arr) noexcept nogil:
+        cdef Py_ssize_t idx
+        cdef float[:, :] my_arr2 = _get_upper_left_corner(my_arr)
+        for idx in range(my_arr2.shape[0]):
+            my_arr2[idx, 0] = self._a
+
+
+cdef inline float[:, :] _get_upper_left_corner(float[:, ::1] arr) noexcept nogil:
+    return arr[:3, :3]