Localvariable

this fix issue https://github.com/serge-sans-paille/pythran/issues/255
On Mon, Aug 18, 2014 at 01:51:55PM -0700, pbrunet wrote:
> In pythran/backend.py:
> >          self.declarations = list()
> >          self.definitions = list()
> >          self.break_handlers = list()
> >          self.result = None
> > +        self.ldecls = set()
> This is just because it is hard to find first definition of ldecls. This way,
> we know all possible attributes for the Cxx backend with there "pseudo types".

OK. It seems to me the pseudo type is list, not set (there's a list
comprehension below)