librustc: Remove `@mut` support from the parser

20 files changed, 52 insertions, 81 deletions

diff --git a/src/librustc/front/feature_gate.rs b/src/librustc/front/feature_gate.rs
index 6bbf18de693..fa0be72b830 100644
--- a/src/librustc/front/feature_gate.rs
+++ b/src/librustc/front/feature_gate.rs
@@ -189,9 +189,8 @@ impl Visitor<()> for Context {
 
     fn visit_expr(&mut self, e: @ast::Expr, _: ()) {
         match e.node {
-            ast::ExprUnary(_, ast::UnBox(..), _) |
-            ast::ExprVstore(_, ast::ExprVstoreBox) |
-            ast::ExprVstore(_, ast::ExprVstoreMutBox) => {
+            ast::ExprUnary(_, ast::UnBox, _) |
+            ast::ExprVstore(_, ast::ExprVstoreBox) => {
                 self.gate_box(e.span);
             }
             _ => {}
diff --git a/src/librustc/middle/check_const.rs b/src/librustc/middle/check_const.rs
index a6a51e95083..c56a268c48f 100644
--- a/src/librustc/middle/check_const.rs
+++ b/src/librustc/middle/check_const.rs
@@ -116,7 +116,7 @@ pub fn check_expr(v: &mut CheckCrateVisitor,
     if is_const {
         match e.node {
           ExprUnary(_, UnDeref, _) => { }
-          ExprUnary(_, UnBox(_), _) | ExprUnary(_, UnUniq, _) => {
+          ExprUnary(_, UnBox, _) | ExprUnary(_, UnUniq, _) => {
             sess.span_err(e.span,
                           "cannot do allocations in constant expressions");
             return;
@@ -197,8 +197,7 @@ pub fn check_expr(v: &mut CheckCrateVisitor,
                      immutable values");
           },
           ExprVstore(_, ExprVstoreUniq) |
-          ExprVstore(_, ExprVstoreBox) |
-          ExprVstore(_, ExprVstoreMutBox) => {
+          ExprVstore(_, ExprVstoreBox) => {
               sess.span_err(e.span, "cannot allocate vectors in constant expressions")
           },
 
diff --git a/src/librustc/middle/const_eval.rs b/src/librustc/middle/const_eval.rs
index e7dddd18aee..20db51861d6 100644
--- a/src/librustc/middle/const_eval.rs
+++ b/src/librustc/middle/const_eval.rs
@@ -239,7 +239,6 @@ impl ConstEvalVisitor {
                     ast::ExprVstoreSlice => self.classify(e),
                     ast::ExprVstoreUniq |
                     ast::ExprVstoreBox |
-                    ast::ExprVstoreMutBox |
                     ast::ExprVstoreMutSlice => non_const
                 }
             }
diff --git a/src/librustc/middle/kind.rs b/src/librustc/middle/kind.rs
index 70abd94ea31..49e57306c12 100644
--- a/src/librustc/middle/kind.rs
+++ b/src/librustc/middle/kind.rs
@@ -306,7 +306,7 @@ pub fn check_expr(cx: &mut Context, e: @Expr) {
     }
 
     match e.node {
-        ExprUnary(_, UnBox(_), interior) => {
+        ExprUnary(_, UnBox, interior) => {
             let interior_type = ty::expr_ty(cx.tcx, interior);
             let _ = check_durable(cx.tcx, interior_type, interior.span);
         }
diff --git a/src/librustc/middle/lint.rs b/src/librustc/middle/lint.rs
index 7503419f8b6..07893280624 100644
--- a/src/librustc/middle/lint.rs
+++ b/src/librustc/middle/lint.rs
@@ -1068,7 +1068,7 @@ fn check_unnecessary_allocation(cx: &Context, e: &ast::Expr) {
             }
         }
         ast::ExprUnary(_, ast::UnUniq, _) |
-        ast::ExprUnary(_, ast::UnBox(..), _) => BoxAllocation,
+        ast::ExprUnary(_, ast::UnBox, _) => BoxAllocation,
 
         _ => return
     };
diff --git a/src/librustc/middle/trans/consts.rs b/src/librustc/middle/trans/consts.rs
index 0dd8b841bcf..9c3a7f4f671 100644
--- a/src/librustc/middle/trans/consts.rs
+++ b/src/librustc/middle/trans/consts.rs
@@ -377,9 +377,7 @@ fn const_expr_unadjusted(cx: @CrateContext,
             let ty = ty::expr_ty(cx.tcx, e);
             let is_float = ty::type_is_fp(ty);
             return (match u {
-              ast::UnBox(_)  |
-              ast::UnUniq |
-              ast::UnDeref  => {
+              ast::UnBox | ast::UnUniq | ast::UnDeref => {
                 let (dv, _dt) = const_deref(cx, te, ty, true);
                 dv
               }
diff --git a/src/librustc/middle/trans/expr.rs b/src/librustc/middle/trans/expr.rs
index 6cece563a82..640f9339a7d 100644
--- a/src/librustc/middle/trans/expr.rs
+++ b/src/librustc/middle/trans/expr.rs
@@ -590,8 +590,7 @@ fn trans_rvalue_datum_unadjusted(bcx: @Block, expr: &ast::Expr) -> DatumBlock {
         ast::ExprPath(_) | ast::ExprSelf => {
             return trans_def_datum_unadjusted(bcx, expr, bcx.def(expr.id));
         }
-        ast::ExprVstore(contents, ast::ExprVstoreBox) |
-        ast::ExprVstore(contents, ast::ExprVstoreMutBox) => {
+        ast::ExprVstore(contents, ast::ExprVstoreBox) => {
             return tvec::trans_uniq_or_managed_vstore(bcx, heap_managed,
                                                       expr, contents);
         }
@@ -1406,9 +1405,8 @@ fn trans_unary_datum(bcx: @Block,
             };
             immediate_rvalue_bcx(bcx, llneg, un_ty)
         }
-        ast::UnBox(_) => {
-            trans_boxed_expr(bcx, un_ty, sub_expr, sub_ty,
-                             heap_managed)
+        ast::UnBox => {
+            trans_boxed_expr(bcx, un_ty, sub_expr, sub_ty, heap_managed)
         }
         ast::UnUniq => {
             let heap  = heap_for_unique(bcx, un_ty);
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index 79eb26091dc..3ae29eade77 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -3257,7 +3257,6 @@ pub fn expr_kind(tcx: ctxt,
         ast::ExprAddrOf(..) |
         ast::ExprBinary(..) |
         ast::ExprVstore(_, ast::ExprVstoreBox) |
-        ast::ExprVstore(_, ast::ExprVstoreMutBox) |
         ast::ExprVstore(_, ast::ExprVstoreUniq) => {
             RvalueDatumExpr
         }
diff --git a/src/librustc/middle/typeck/astconv.rs b/src/librustc/middle/typeck/astconv.rs
index 24c4b3399bc..746389c6044 100644
--- a/src/librustc/middle/typeck/astconv.rs
+++ b/src/librustc/middle/typeck/astconv.rs
@@ -401,8 +401,8 @@ pub fn ast_ty_to_ty<AC:AstConv, RS:RegionScope>(
     let typ = match ast_ty.node {
       ast::ty_nil => ty::mk_nil(),
       ast::ty_bot => ty::mk_bot(),
-      ast::ty_box(ref mt) => {
-        let mt = ast::mt { ty: mt.ty, mutbl: ast::MutImmutable };
+      ast::ty_box(ty) => {
+        let mt = ast::mt { ty: ty, mutbl: ast::MutImmutable };
         mk_pointer(this, rscope, &mt, ty::vstore_box,
                    |tmt| ty::mk_box(tcx, tmt.ty))
       }
diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index dde55f320bc..088104e84ef 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -2628,15 +2628,12 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
           }
           ast::ExprVec(ref args, mutbl) => {
             let tt = ast_expr_vstore_to_vstore(fcx, ev, vst);
-            let mutability;
             let mut any_error = false;
             let mut any_bot = false;
-            match vst {
-                ast::ExprVstoreMutBox | ast::ExprVstoreMutSlice => {
-                    mutability = ast::MutMutable
-                }
-                _ => mutability = mutbl
-            }
+            let mutability = match vst {
+                ast::ExprVstoreMutSlice => ast::MutMutable,
+                _ => mutbl,
+            };
             let t: ty::t = fcx.infcx().next_ty_var();
             for e in args.iter() {
                 check_expr_has_type(fcx, *e, t);
@@ -2650,11 +2647,9 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
             }
             if any_error {
                 ty::mk_err()
-            }
-            else if any_bot {
+            } else if any_bot {
                 ty::mk_bot()
-            }
-            else {
+            } else {
                 ty::mk_evec(tcx, ty::mt {ty: t, mutbl: mutability}, tt)
             }
           }
@@ -2663,10 +2658,8 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
             let _ = ty::eval_repeat_count(fcx, count_expr);
             let tt = ast_expr_vstore_to_vstore(fcx, ev, vst);
             let mutability = match vst {
-                ast::ExprVstoreMutBox | ast::ExprVstoreMutSlice => {
-                    ast::MutMutable
-                }
-                _ => mutbl
+                ast::ExprVstoreMutSlice => ast::MutMutable,
+                _ => mutbl,
             };
             let t: ty::t = fcx.infcx().next_ty_var();
             check_expr_has_type(fcx, element, t);
@@ -2741,7 +2734,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
       ast::ExprUnary(callee_id, unop, oprnd) => {
         let exp_inner = unpack_expected(fcx, expected, |sty| {
             match unop {
-              ast::UnBox(_) | ast::UnUniq => match *sty {
+              ast::UnBox | ast::UnUniq => match *sty {
                 ty::ty_box(ty) => Some(ty),
                 ty::ty_uniq(ref mt) => Some(mt.ty),
                 _ => None
@@ -2755,7 +2748,7 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
         if !ty::type_is_error(oprnd_t) &&
               !ty::type_is_bot(oprnd_t) {
             match unop {
-                ast::UnBox(_) => {
+                ast::UnBox => {
                     oprnd_t = ty::mk_box(tcx, oprnd_t)
                 }
                 ast::UnUniq => {
@@ -3920,7 +3913,7 @@ pub fn ast_expr_vstore_to_vstore(fcx: @FnCtxt,
                               -> ty::vstore {
     match v {
         ast::ExprVstoreUniq => ty::vstore_uniq,
-        ast::ExprVstoreBox | ast::ExprVstoreMutBox => ty::vstore_box,
+        ast::ExprVstoreBox => ty::vstore_box,
         ast::ExprVstoreSlice | ast::ExprVstoreMutSlice => {
             let r = fcx.infcx().next_region_var(infer::AddrOfSlice(e.span));
             ty::vstore_slice(r)
diff --git a/src/librustdoc/clean.rs b/src/librustdoc/clean.rs
index 4bcf1985ef2..52dbba13ea8 100644
--- a/src/librustdoc/clean.rs
+++ b/src/librustdoc/clean.rs
@@ -594,7 +594,7 @@ pub enum Type {
     /// aka ty_bot
     Bottom,
     Unique(~Type),
-    Managed(Mutability, ~Type),
+    Managed(~Type),
     RawPointer(Mutability, ~Type),
     BorrowedRef { lifetime: Option<Lifetime>, mutability: Mutability, type_: ~Type},
     // region, raw, other boxes, mutable
@@ -620,7 +620,7 @@ impl Clean<Type> for ast::Ty {
             ty_rptr(ref l, ref m) =>
                 BorrowedRef {lifetime: l.clean(), mutability: m.mutbl.clean(),
                              type_: ~m.ty.clean()},
-            ty_box(ref m) => Managed(m.mutbl.clean(), ~m.ty.clean()),
+            ty_box(ty) => Managed(~ty.clean()),
             ty_uniq(ty) => Unique(~ty.clean()),
             ty_vec(ty) => Vector(~ty.clean()),
             ty_fixed_length_vec(ty, ref e) => FixedVector(~ty.clean(),
diff --git a/src/librustdoc/html/format.rs b/src/librustdoc/html/format.rs
index 04da17d4ec4..b32ca037261 100644
--- a/src/librustdoc/html/format.rs
+++ b/src/librustdoc/html/format.rs
@@ -340,13 +340,7 @@ impl fmt::Default for clean::Type {
             clean::Unit => f.buf.write("()".as_bytes()),
             clean::Bottom => f.buf.write("!".as_bytes()),
             clean::Unique(ref t) => write!(f.buf, "~{}", **t),
-            clean::Managed(m, ref t) => {
-                write!(f.buf, "@{}{}",
-                       match m {
-                           clean::Mutable => "mut ",
-                           clean::Immutable => "",
-                       }, **t)
-            }
+            clean::Managed(ref t) => write!(f.buf, "@{}", **t),
             clean::RawPointer(m, ref t) => {
                 write!(f.buf, "*{}{}",
                        match m {
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 4d744f4df29..3523d63ef60 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -415,7 +415,6 @@ pub enum Vstore {
 pub enum ExprVstore {
     ExprVstoreUniq,                 // ~[1,2,3,4]
     ExprVstoreBox,                  // @[1,2,3,4]
-    ExprVstoreMutBox,               // @mut [1,2,3,4]
     ExprVstoreSlice,                // &[1,2,3,4]
     ExprVstoreMutSlice,             // &mut [1,2,3,4]
 }
@@ -444,7 +443,7 @@ pub enum BinOp {
 
 #[deriving(Clone, Eq, Encodable, Decodable, IterBytes)]
 pub enum UnOp {
-    UnBox(Mutability),
+    UnBox,
     UnUniq,
     UnDeref,
     UnNot,
@@ -875,7 +874,7 @@ pub struct TyBareFn {
 pub enum ty_ {
     ty_nil,
     ty_bot, /* bottom type */
-    ty_box(mt),
+    ty_box(P<Ty>),
     ty_uniq(P<Ty>),
     ty_vec(P<Ty>),
     ty_fixed_length_vec(P<Ty>, @Expr),
diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index 70e4922aabf..f99fed517b1 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -137,13 +137,13 @@ pub fn is_shift_binop(b: BinOp) -> bool {
     }
 }
 
-pub fn unop_to_str(op: UnOp) -> ~str {
+pub fn unop_to_str(op: UnOp) -> &'static str {
     match op {
-      UnBox(mt) => if mt == MutMutable { ~"@mut " } else { ~"@" },
-      UnUniq => ~"~",
-      UnDeref => ~"*",
-      UnNot => ~"!",
-      UnNeg => ~"-"
+      UnBox => "@",
+      UnUniq => "~",
+      UnDeref => "*",
+      UnNot => "!",
+      UnNeg => "-",
     }
 }
 
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index 1a3513ab81c..481472e8f0b 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -54,7 +54,7 @@ pub trait AstBuilder {
                lifetime: Option<ast::Lifetime>,
                mutbl: ast::Mutability) -> P<ast::Ty>;
     fn ty_uniq(&self, span: Span, ty: P<ast::Ty>) -> P<ast::Ty>;
-    fn ty_box(&self, span: Span, ty: P<ast::Ty>, mutbl: ast::Mutability) -> P<ast::Ty>;
+    fn ty_box(&self, span: Span, ty: P<ast::Ty>) -> P<ast::Ty>;
 
     fn ty_option(&self, ty: P<ast::Ty>) -> P<ast::Ty>;
     fn ty_infer(&self, sp: Span) -> P<ast::Ty>;
@@ -311,12 +311,13 @@ impl AstBuilder for ExtCtxt {
         self.ty(span,
                 ast::ty_rptr(lifetime, self.ty_mt(ty, mutbl)))
     }
+
     fn ty_uniq(&self, span: Span, ty: P<ast::Ty>) -> P<ast::Ty> {
         self.ty(span, ast::ty_uniq(ty))
     }
-    fn ty_box(&self, span: Span,
-                 ty: P<ast::Ty>, mutbl: ast::Mutability) -> P<ast::Ty> {
-        self.ty(span, ast::ty_box(self.ty_mt(ty, mutbl)))
+
+    fn ty_box(&self, span: Span, ty: P<ast::Ty>) -> P<ast::Ty> {
+        self.ty(span, ast::ty_box(ty))
     }
 
     fn ty_option(&self, ty: P<ast::Ty>) -> P<ast::Ty> {
@@ -494,7 +495,7 @@ impl AstBuilder for ExtCtxt {
     }
 
     fn expr_managed(&self, sp: Span, e: @ast::Expr) -> @ast::Expr {
-        self.expr_unary(sp, ast::UnBox(ast::MutImmutable), e)
+        self.expr_unary(sp, ast::UnBox, e)
     }
 
     fn expr_field_access(&self, sp: Span, expr: @ast::Expr, ident: ast::Ident) -> @ast::Expr {
diff --git a/src/libsyntax/ext/deriving/ty.rs b/src/libsyntax/ext/deriving/ty.rs
index 10e07520a84..89bed626c1e 100644
--- a/src/libsyntax/ext/deriving/ty.rs
+++ b/src/libsyntax/ext/deriving/ty.rs
@@ -24,7 +24,7 @@ use opt_vec::OptVec;
 /// The types of pointers
 pub enum PtrTy<'a> {
     Send, // ~
-    Managed(ast::Mutability), // @[mut]
+    Managed, // @
     Borrowed(Option<&'a str>, ast::Mutability), // &['lifetime] [mut]
 }
 
@@ -138,8 +138,8 @@ impl<'a> Ty<'a> {
                     Send => {
                         cx.ty_uniq(span, raw_ty)
                     }
-                    Managed(mutbl) => {
-                        cx.ty_box(span, raw_ty, mutbl)
+                    Managed => {
+                        cx.ty_box(span, raw_ty)
                     }
                     Borrowed(ref lt, mutbl) => {
                         let lt = mk_lifetime(cx, span, lt);
@@ -251,7 +251,7 @@ pub fn get_explicit_self(cx: &ExtCtxt, span: Span, self_ptr: &Option<PtrTy>)
                 span,
                 match *ptr {
                     Send => ast::sty_uniq(ast::MutImmutable),
-                    Managed(mutbl) => ast::sty_box(mutbl),
+                    Managed => ast::sty_box(ast::MutImmutable),
                     Borrowed(ref lt, mutbl) => {
                         let lt = lt.map(|s| cx.lifetime(span, cx.ident_of(s)));
                         ast::sty_region(lt, mutbl)
diff --git a/src/libsyntax/fold.rs b/src/libsyntax/fold.rs
index 4a2adc04fbd..dea30d181da 100644
--- a/src/libsyntax/fold.rs
+++ b/src/libsyntax/fold.rs
@@ -238,7 +238,7 @@ pub trait ast_fold {
     fn fold_ty(&mut self, t: P<Ty>) -> P<Ty> {
         let node = match t.node {
             ty_nil | ty_bot | ty_infer => t.node.clone(),
-            ty_box(ref mt) => ty_box(fold_mt(mt, self)),
+            ty_box(ty) => ty_box(self.fold_ty(ty)),
             ty_uniq(ty) => ty_uniq(self.fold_ty(ty)),
             ty_vec(ty) => ty_vec(self.fold_ty(ty)),
             ty_ptr(ref mt) => ty_ptr(fold_mt(mt, self)),
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index ca856a53116..40a2ef86e4f 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -29,8 +29,7 @@ use ast::{ExprField, ExprFnBlock, ExprIf, ExprIndex};
 use ast::{ExprLit, ExprLogLevel, ExprLoop, ExprMac};
 use ast::{ExprMethodCall, ExprParen, ExprPath, ExprProc, ExprRepeat};
 use ast::{ExprRet, ExprSelf, ExprStruct, ExprTup, ExprUnary};
-use ast::{ExprVec, ExprVstore, ExprVstoreMutBox};
-use ast::{ExprVstoreSlice, ExprVstoreBox};
+use ast::{ExprVec, ExprVstore, ExprVstoreSlice, ExprVstoreBox};
 use ast::{ExprVstoreMutSlice, ExprWhile, ExprForLoop, extern_fn, Field, fn_decl};
 use ast::{ExprVstoreUniq, Onceness, Once, Many};
 use ast::{foreign_item, foreign_item_static, foreign_item_fn, foreign_mod};
@@ -1300,7 +1299,7 @@ impl Parser {
         if sigil == OwnedSigil {
             ty_uniq(self.parse_ty(false))
         } else {
-            ty_box(self.parse_mt())
+            ty_box(self.parse_ty(false))
         }
     }
 
@@ -2300,17 +2299,14 @@ impl Parser {
           }
           token::AT => {
             self.bump();
-            let m = self.parse_mutability();
             let e = self.parse_prefix_expr();
             hi = e.span.hi;
             // HACK: turn @[...] into a @-evec
             ex = match e.node {
-              ExprVec(..) | ExprRepeat(..) if m == MutMutable =>
-                ExprVstore(e, ExprVstoreMutBox),
               ExprVec(..) |
               ExprLit(@codemap::Spanned { node: lit_str(..), span: _}) |
-              ExprRepeat(..) if m == MutImmutable => ExprVstore(e, ExprVstoreBox),
-              _ => self.mk_unary(UnBox(m), e)
+              ExprRepeat(..) => ExprVstore(e, ExprVstoreBox),
+              _ => self.mk_unary(UnBox, e)
             };
           }
           token::TILDE => {
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index 0d68f117460..15dfacc41f1 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -422,7 +422,7 @@ pub fn print_type(s: &mut ps, ty: &ast::Ty) {
     match ty.node {
       ast::ty_nil => word(&mut s.s, "()"),
       ast::ty_bot => word(&mut s.s, "!"),
-      ast::ty_box(ref mt) => { word(&mut s.s, "@"); print_mt(s, mt); }
+      ast::ty_box(ty) => { word(&mut s.s, "@"); print_type(s, ty); }
       ast::ty_uniq(ty) => { word(&mut s.s, "~"); print_type(s, ty); }
       ast::ty_vec(ty) => {
         word(&mut s.s, "[");
@@ -1083,10 +1083,6 @@ pub fn print_expr_vstore(s: &mut ps, t: ast::ExprVstore) {
     match t {
       ast::ExprVstoreUniq => word(&mut s.s, "~"),
       ast::ExprVstoreBox => word(&mut s.s, "@"),
-      ast::ExprVstoreMutBox => {
-        word(&mut s.s, "@");
-        word(&mut s.s, "mut");
-      }
       ast::ExprVstoreSlice => word(&mut s.s, "&"),
       ast::ExprVstoreMutSlice => {
         word(&mut s.s, "&");
diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index 2e83a038c58..29567ab9442 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -302,10 +302,10 @@ pub fn skip_ty<E, V:Visitor<E>>(_: &mut V, _: &Ty, _: E) {
 
 pub fn walk_ty<E:Clone, V:Visitor<E>>(visitor: &mut V, typ: &Ty, env: E) {
     match typ.node {
-        ty_uniq(ty) | ty_vec(ty) => {
+        ty_uniq(ty) | ty_vec(ty) | ty_box(ty) => {
             visitor.visit_ty(ty, env)
         }
-        ty_box(ref mutable_type) | ty_ptr(ref mutable_type) => {
+        ty_ptr(ref mutable_type) => {
             visitor.visit_ty(mutable_type.ty, env)
         }
         ty_rptr(ref lifetime, ref mutable_type) => {