# HG changeset patch
# User Augie Fackler <augie@google.com>
# Date 2019-11-06 20:11:30
# Node ID b16912f8c07ccf183b44147589d96b0fa5ca9e35
# Parent  2dcd4e7731932f876e6446df8a141148f7cc6852

vfs: add a NotImplementedError implementation of __call__

This helps pytype considerably on this file.

Differential Revision: https://phab.mercurial-scm.org/D7265

diff --git a/mercurial/vfs.py b/mercurial/vfs.py
--- a/mercurial/vfs.py
+++ b/mercurial/vfs.py
@@ -54,6 +54,9 @@ class abstractvfs(object):
         '''Prevent instantiation; don't call this from subclasses.'''
         raise NotImplementedError('attempted instantiating ' + str(type(self)))
 
+    def __call__(self, path, mode=b'rb', **kwargs):
+        raise NotImplementedError
+
     def _auditpath(self, path, mode):
         raise NotImplementedError