gh-123930: Better error for "from imports" when script shadows module

Doc/whatsnew/3.13.rst

@@ -289,7 +289,7 @@ Improved error messages
        File "/home/me/numpy.py", line 3, in <module>
          np.array([1, 2, 3])
          ^^^^^^^^
-     AttributeError: module 'numpy' has no attribute 'array' (consider renaming '/home/me/numpy.py' if it has the same name as a third-party module you intended to import)
+     AttributeError: module 'numpy' has no attribute 'array' (consider renaming '/home/me/numpy.py' if it has the same name as a library you intended to import)
 
   (Contributed by Shantanu Jain in :gh:`95754`.)
 

Include/internal/pycore_moduleobject.h

@@ -11,6 +11,8 @@ extern "C" {
 extern void _PyModule_Clear(PyObject *);
 extern void _PyModule_ClearDict(PyObject *);
 extern int _PyModuleSpec_IsInitializing(PyObject *);
+extern int _PyModuleSpec_GetFileOrigin(PyObject *, PyObject **);
+extern int _PyModule_IsPossiblyShadowing(PyObject *);
 
 extern int _PyModule_IsExtension(PyObject *obj);