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

1 files changed, 1 insertions, 0 deletions

diff --git a/src/libsyntax/syntax.rc b/src/libsyntax/syntax.rc
index 05bbe43ee9a..9eb7507f3d0 100644
--- a/src/libsyntax/syntax.rc
+++ b/src/libsyntax/syntax.rc
@@ -35,6 +35,7 @@ pub mod syntax {
     pub use parse;
 }
 
+pub mod opt_vec;
 pub mod attr;
 pub mod diagnostic;
 pub mod codemap;