Implement RFC 1058

src/librustc/lib.rs

@@ -53,7 +53,7 @@
 #![feature(rustc_private)]
 #![feature(scoped_tls)]
 #![feature(slice_bytes)]
-#![feature(slice_extras)]
+#![feature(slice_splits)]
 #![feature(slice_patterns)]
 #![feature(slice_position_elem)]
 #![feature(staged_api)]

src/librustc/metadata/decoder.rs

@@ -688,7 +688,7 @@ pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: ast::NodeI
                                 -> csearch::FoundAst<'tcx> {
     debug!("Looking up item: {}", id);
     let item_doc = lookup_item(id, cdata.data());
-    let path = item_path(item_doc).init().to_vec();
+    let path = item_path(item_doc).split_last().unwrap().1.to_vec();
     match decode_inlined_item(cdata, tcx, path, item_doc) {
         Ok(ii) => csearch::FoundAst::Found(ii),
         Err(path) => {

src/librustc/middle/check_match.rs

@@ -696,12 +696,12 @@ fn is_useful(cx: &MatchCheckCtxt,
             Some(constructor) => {
                 let matrix = rows.iter().filter_map(|r| {
                     if pat_is_binding_or_wild(&cx.tcx.def_map, raw_pat(r[0])) {
-                        Some(r.tail().to_vec())
+                        Some(r[1..].to_vec())
                     } else {
                         None
                     }
                 }).collect();
-                match is_useful(cx, &matrix, v.tail(), witness) {
+                match is_useful(cx, &matrix, &v[1..], witness) {
                     UsefulWithWitness(pats) => {
                         let arity = constructor_arity(cx, &constructor, left_ty);
                         let wild_pats = vec![DUMMY_WILD_PAT; arity];

src/librustc/middle/infer/error_reporting.rs

@@ -1495,7 +1495,7 @@ impl<'a, 'tcx> Rebuilder<'a, 'tcx> {
             parameters: new_parameters
         };
         let mut new_segs = Vec::new();
-        new_segs.push_all(path.segments.init());
+        new_segs.push_all(path.segments.split_last().unwrap().1);
         new_segs.push(new_seg);
         ast::Path {
             span: path.span,

src/librustc/middle/traits/select.rs

@@ -2571,7 +2571,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 for &i in &ty_params {
                     new_substs.types.get_mut_slice(TypeSpace)[i] = tcx.types.err;
                 }
-                for &ty in fields.init() {
+                for &ty in fields.split_last().unwrap().1 {
                     if ty.subst(tcx, &new_substs).references_error() {
                         return Err(Unimplemented);
                     }