Fix up build warnings about use of []

Author: bossmc

src/librustc/middle/astconv_util.rs

@@ -68,7 +68,7 @@ pub fn ast_ty_to_prim_ty<'tcx>(tcx: &ty::ctxt<'tcx>, ast_ty: &ast::Ty)
             Some(d) => d.full_def()
         };
         if let def::DefPrimTy(nty) = def {
-            Some(prim_ty_to_ty(tcx, &path.segments[], nty))
+            Some(prim_ty_to_ty(tcx, &path.segments[..], nty))
         } else {
             None
         }

src/librustc_resolve/lib.rs

@@ -2985,7 +2985,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         } else {
             let msg = format!("use of undeclared trait name `{}`",
                               self.path_names_to_string(trait_path, path_depth));
-            self.resolve_error(trait_path.span, &msg[]);
+            self.resolve_error(trait_path.span, &msg[..]);
             Err(())
         }
     }