bpo-31844: Remove _markupbase.ParserBase.error()

Author: berkerpeksag

Lib/_markupbase.py

@@ -29,10 +29,6 @@ def __init__(self):
             raise RuntimeError(
                 "_markupbase.ParserBase must be subclassed")
 
-    def error(self, message):
-        raise NotImplementedError(
-            "subclasses of ParserBase must override error()")
-
     def reset(self):
         self.lineno = 1
         self.offset = 0

Misc/NEWS.d/next/Library/2018-07-30-12-48-17.bpo-31844.0_GKsD.rst

@@ -0,0 +1,4 @@
+Remove ``ParserBase.error()`` method from the private and undocumented
+``_markupbase`` module.  :class:`html.parser.HTMLParser` is the only
+subclass of ``ParserBase`` and its ``error()`` implementation was deprecated
+in Python 3.4 and removed in Python 3.5.