Cunningly avoid specifying the problematic cases.

Doc/library/pathlib.rst

@@ -1597,6 +1597,10 @@ Copying, moving and deleting
    Recursively move this file or directory tree to the given *target*, and
    return a new :class:`!Path` instance pointing to *target*.
 
+   If the *target* doesn't exist it will be created. If both this path and the
+   *target* are existing files, then the target is overwritten. If the
+   *target* is a non-empty directory, :exc:`OSError` is raised.
+
    If both paths are on the same filesystem, the move is performed with
    :func:`os.replace`. Otherwise, this path is copied (preserving metadata and
    symlinks) and then deleted.

Lib/pathlib/_abc.py

@@ -934,7 +934,7 @@ def unlink(self, missing_ok=False):
         """
         raise UnsupportedOperation(self._unsupported_msg('unlink()'))
 
-    def rmdir(self, missing_ok=False):
+    def rmdir(self):
         """
         Remove this directory.  The directory must be empty.
         """

Lib/pathlib/_local.py

@@ -825,15 +825,11 @@ def unlink(self, missing_ok=False):
             if not missing_ok:
                 raise
 
-    def rmdir(self, missing_ok=False):
+    def rmdir(self):
         """
         Remove this directory.  The directory must be empty.
         """
-        try:
-            os.rmdir(self)
-        except FileNotFoundError:
-            if not missing_ok:
-                raise
+        os.rmdir(self)
 
     def rmtree(self, ignore_errors=False, on_error=None):
         """

Lib/test/test_pathlib/test_pathlib.py

@@ -776,26 +776,14 @@ def test_move_file_to_file_other_fs(self):
     def test_move_file_to_dir_other_fs(self):
         self.test_move_file_to_dir()
 
-    @patch_replace
-    def test_move_file_to_empty_dir_other_fs(self):
-        self.test_move_file_to_empty_dir()
-
     @patch_replace
     def test_move_dir_other_fs(self):
         self.test_move_dir()
 
-    @patch_replace
-    def test_move_dir_to_file_other_fs(self):
-        self.test_move_dir_to_file()
-
     @patch_replace
     def test_move_dir_to_dir_other_fs(self):
         self.test_move_dir_to_dir()
 
-    @patch_replace
-    def test_move_dir_to_empty_dir_other_fs(self):
-        self.test_move_dir_to_empty_dir()
-
     @patch_replace
     def test_move_dir_into_itself_other_fs(self):
         self.test_move_dir_into_itself()

Lib/test/test_pathlib/test_pathlib_abc.py

@@ -2011,13 +2011,6 @@ def test_move_file_to_dir(self):
         target = base / 'dirB'
         self.assertRaises(OSError, source.move, target)
 
-    def test_move_file_to_empty_dir(self):
-        base = self.cls(self.base)
-        source = base / 'fileA'
-        target = base / 'fileA_moved'
-        target.mkdir()
-        self.assertRaises(OSError, source.move, target)
-
     def test_move_dir(self):
         base = self.cls(self.base)
         source = base / 'dirC'
@@ -2034,25 +2027,12 @@ def test_move_dir(self):
         self.assertTrue(target.joinpath('fileC').read_text(),
                         "this is file C\n")
 
-    def test_move_dir_to_file(self):
-        base = self.cls(self.base)
-        source = base / 'dirB'
-        target = base / 'fileA'
-        self.assertRaises(OSError, source.move, target)
-
     def test_move_dir_to_dir(self):
         base = self.cls(self.base)
         source = base / 'dirC'
         target = base / 'dirB'
         self.assertRaises(OSError, source.move, target)
 
-    def test_move_dir_to_empty_dir(self):
-        base = self.cls(self.base)
-        source = base / 'dirC'
-        target = base / 'dirC_moved'
-        target.mkdir()
-        self.assertRaises(OSError, source.move, target)
-
     def test_move_dir_into_itself(self):
         base = self.cls(self.base)
         source = base / 'dirC'