Niko Matsakis c623d21e38 Introduce lifetime declarations into the lists of type parameters.
Major changes are:
- replace ~[ty_param] with Generics structure, which includes
  both OptVec<TyParam> and OptVec<Lifetime>;
- the use of syntax::opt_vec to avoid allocation for empty lists;

cc #4846
2013-02-27 19:42:09 -05:00
..