fix: stop re-exporting private _optional_cuda_import from __init__

The re-export shadowed the `_optional_cuda_import` submodule with the
function of the same name, breaking `import ... as` in tests. Import
directly from the submodule in consumers instead.

Made-with: Cursor

Author: cpcloud

cuda_core/cuda/core/_linker.pyx

@@ -29,7 +29,7 @@ from dataclasses import dataclass
 from typing import Union
 from warnings import warn
 
-from cuda.pathfinder import _optional_cuda_import
+from cuda.pathfinder._optional_cuda_import import _optional_cuda_import
 from cuda.core._device import Device
 from cuda.core._module import ObjectCode
 from cuda.core._utils.clear_error_support import assert_type

cuda_core/cuda/core/_program.pyx

@@ -14,7 +14,7 @@ import threading
 from warnings import warn
 
 from cuda.bindings import driver, nvrtc
-from cuda.pathfinder import _optional_cuda_import
+from cuda.pathfinder._optional_cuda_import import _optional_cuda_import
 
 from libcpp.vector cimport vector
 

cuda_pathfinder/cuda/pathfinder/__init__.py

@@ -25,7 +25,6 @@
     locate_nvidia_header_directory as locate_nvidia_header_directory,
 )
 from cuda.pathfinder._headers.supported_nvidia_headers import SUPPORTED_HEADERS_CTK as _SUPPORTED_HEADERS_CTK
-from cuda.pathfinder._optional_cuda_import import _optional_cuda_import as _optional_cuda_import
 from cuda.pathfinder._static_libs.find_bitcode_lib import (
     SUPPORTED_BITCODE_LIBS as _SUPPORTED_BITCODE_LIBS,
 )