rustc: Use std::util::unreachable

src/rustc/middle/resolve.rs

@@ -859,7 +859,7 @@ fn find_fn_or_mod_scope(sc: scopes) -> option<scope> {
               _ { ret none; }
             }
         }
-        fail;
+        std::util::unreachable()
     }
     let path = name;
     alt cx {

src/rustc/middle/trans/alt.rs

@@ -70,7 +70,7 @@ fn variant_opt(tcx: ty::ctxt, pat_id: ast::node_id) -> opt {
     for v: ty::variant_info in *variants {
         if vdef.var == v.id { ret var(v.disr_val, vdef); }
     }
-    fail;
+    std::util::unreachable();
 }
 
 type bind_map = [{ident: ast::ident, val: ValueRef}];

src/rustc/middle/typeck.rs

@@ -1036,7 +1036,7 @@ fn do_autoderef(fcx: @fn_ctxt, sp: span, t: ty::t) -> ty::t {
           _ { ret t1; }
         }
     }
-    fail;
+    std::util::unreachable();
 }
 
 fn resolve_type_vars_if_possible(fcx: @fn_ctxt, typ: ty::t) -> ty::t {

src/rustc/syntax/print/pprust.rs

@@ -1418,7 +1418,7 @@ fn operator_prec(op: ast::binop) -> int {
     for spec: parse::parser::op_spec in *parse::parser::prec_table() {
         if spec.op == op { ret spec.prec; }
     }
-    fail;
+    std::util::unreachable();
 }
 
 fn need_parens(expr: @ast::expr, outer_prec: int) -> bool {