ianh@dhalsim:~/temp/html5/html5lib$ ./parse.py "test"
Traceback (most recent call last):
  File "./parse.py", line 126, in ?
    parse()
  File "./parse.py", line 87, in parse
    document = p.parse(f)
  File "/home/.hardangervidda/ianh/temp/html5/html5lib/src/html5parser.py", line 118, in parse
    self.phase.processEOF()
  File "/home/.hardangervidda/ianh/temp/html5/html5lib/src/html5parser.py", line 232, in processEOF
    self.tree.generateImpliedEndTags()
  File "/home/.hardangervidda/ianh/temp/html5/html5lib/src/treebuilders/_base.py", line 297, in generateImpliedEndTags
    if (name in frozenset(("dd", "dt", "li", "p", "td", "th", "tr"))
NameError: global name 'frozenset' is not defined