Check that no tag in the method dispatcher is duplicated (#255)

Check that no tag in the method dispatcher is duplicated; r=nobody!

Author: gsnedders

html5lib/html5parser.py

@@ -893,7 +893,7 @@ def __init__(self, parser, tree):
                 ("body", self.startTagBody),
                 ("frameset", self.startTagFrameset),
                 (("address", "article", "aside", "blockquote", "center", "details",
-                  "details", "dir", "div", "dl", "fieldset", "figcaption", "figure",
+                  "dir", "div", "dl", "fieldset", "figcaption", "figure",
                   "footer", "header", "hgroup", "main", "menu", "nav", "ol", "p",
                   "section", "summary", "ul"),
                  self.startTagCloseP),

html5lib/utils.py

@@ -61,6 +61,7 @@ def __init__(self, items=()):
             else:
                 _dictEntries.append((name, value))
         dict.__init__(self, _dictEntries)
+        assert len(self) == len(_dictEntries)
         self.default = None
 
     def __getitem__(self, key):