From 948b5ab87ad12b476cb720f63db2cbc9ab4e0d74 Mon Sep 17 00:00:00 2001
From: blake2-ppc <blake2-ppc>
Date: Mon, 30 Sep 2013 19:37:17 +0200
Subject: [PATCH] trans: Change @ast::Expr -> &ast::Expr where possible

---
 src/librustc/middle/dataflow.rs          | 12 +++---
 src/librustc/middle/trans/_match.rs      |  6 +--
 src/librustc/middle/trans/callee.rs      | 16 ++++----
 src/librustc/middle/trans/common.rs      |  2 +-
 src/librustc/middle/trans/consts.rs      |  2 +-
 src/librustc/middle/trans/controlflow.rs |  4 +-
 src/librustc/middle/trans/expr.rs        | 48 ++++++++++++------------
 src/librustc/middle/trans/meth.rs        | 10 ++---
 src/librustc/middle/trans/tvec.rs        | 12 +++---
 9 files changed, 56 insertions(+), 56 deletions(-)

diff --git a/src/librustc/middle/dataflow.rs b/src/librustc/middle/dataflow.rs
index 1af39f02d82..0e4d2bcd910 100644
--- a/src/librustc/middle/dataflow.rs
+++ b/src/librustc/middle/dataflow.rs
@@ -422,7 +422,7 @@ impl<'self, O:DataFlowOperator> PropagationContext<'self, O> {
     }
 
     fn walk_expr(&mut self,
-                 expr: @ast::Expr,
+                 expr: &ast::Expr,
                  in_out: &mut [uint],
                  loop_scopes: &mut ~[LoopScope]) {
         debug!("DataFlowContext::walk_expr(expr=%s, in_out=%s)",
@@ -744,7 +744,7 @@ impl<'self, O:DataFlowOperator> PropagationContext<'self, O> {
     }
 
     fn pop_scopes(&mut self,
-                  from_expr: @ast::Expr,
+                  from_expr: &ast::Expr,
                   to_scope: &mut LoopScope,
                   in_out: &mut [uint]) {
         //! Whenever you have a `break` or a `loop` statement, flow
@@ -778,7 +778,7 @@ impl<'self, O:DataFlowOperator> PropagationContext<'self, O> {
     }
 
     fn break_from_to(&mut self,
-                     from_expr: @ast::Expr,
+                     from_expr: &ast::Expr,
                      to_scope: &mut LoopScope,
                      in_out: &mut [uint]) {
         self.pop_scopes(from_expr, to_scope, in_out);
@@ -811,7 +811,7 @@ impl<'self, O:DataFlowOperator> PropagationContext<'self, O> {
     fn walk_call(&mut self,
                  _callee_id: ast::NodeId,
                  call_id: ast::NodeId,
-                 arg0: @ast::Expr,
+                 arg0: &ast::Expr,
                  args: &[@ast::Expr],
                  in_out: &mut [uint],
                  loop_scopes: &mut ~[LoopScope]) {
@@ -865,7 +865,7 @@ impl<'self, O:DataFlowOperator> PropagationContext<'self, O> {
     }
 
     fn find_scope<'a>(&self,
-                      expr: @ast::Expr,
+                      expr: &ast::Expr,
                       label: Option<ast::Name>,
                       loop_scopes: &'a mut ~[LoopScope]) -> &'a mut LoopScope {
         let index = match label {
@@ -899,7 +899,7 @@ impl<'self, O:DataFlowOperator> PropagationContext<'self, O> {
         &mut loop_scopes[index]
     }
 
-    fn is_method_call(&self, expr: @ast::Expr) -> bool {
+    fn is_method_call(&self, expr: &ast::Expr) -> bool {
         self.dfcx.method_map.contains_key(&expr.id)
     }
 
diff --git a/src/librustc/middle/trans/_match.rs b/src/librustc/middle/trans/_match.rs
index 0de01bced1f..c2dbcfa3b57 100644
--- a/src/librustc/middle/trans/_match.rs
+++ b/src/librustc/middle/trans/_match.rs
@@ -1398,7 +1398,7 @@ fn insert_lllocals(bcx: @mut Block,
 }
 
 fn compile_guard(bcx: @mut Block,
-                     guard_expr: @ast::Expr,
+                     guard_expr: &ast::Expr,
                      data: &ArmData,
                      m: &[Match],
                      vals: &[ValueRef],
@@ -1826,7 +1826,7 @@ fn compile_submatch_continue(mut bcx: @mut Block,
 
 pub fn trans_match(bcx: @mut Block,
                    match_expr: &ast::Expr,
-                   discr_expr: @ast::Expr,
+                   discr_expr: &ast::Expr,
                    arms: &[ast::Arm],
                    dest: Dest) -> @mut Block {
     let _icx = push_ctxt("match::trans_match");
@@ -1876,7 +1876,7 @@ fn create_bindings_map(bcx: @mut Block, pat: @ast::Pat) -> BindingsMap {
 }
 
 fn trans_match_inner(scope_cx: @mut Block,
-                         discr_expr: @ast::Expr,
+                         discr_expr: &ast::Expr,
                          arms: &[ast::Arm],
                          dest: Dest) -> @mut Block {
     let _icx = push_ctxt("match::trans_match_inner");
diff --git a/src/librustc/middle/trans/callee.rs b/src/librustc/middle/trans/callee.rs
index a327b2e1939..a3788d7cbde 100644
--- a/src/librustc/middle/trans/callee.rs
+++ b/src/librustc/middle/trans/callee.rs
@@ -77,7 +77,7 @@ pub struct Callee {
     data: CalleeData
 }
 
-pub fn trans(bcx: @mut Block, expr: @ast::Expr) -> Callee {
+pub fn trans(bcx: @mut Block, expr: &ast::Expr) -> Callee {
     let _icx = push_ctxt("trans_callee");
     debug!("callee::trans(expr=%s)", expr.repr(bcx.tcx()));
 
@@ -92,7 +92,7 @@ pub fn trans(bcx: @mut Block, expr: @ast::Expr) -> Callee {
     // any other expressions are closures:
     return datum_callee(bcx, expr);
 
-    fn datum_callee(bcx: @mut Block, expr: @ast::Expr) -> Callee {
+    fn datum_callee(bcx: @mut Block, expr: &ast::Expr) -> Callee {
         let DatumBlock {bcx, datum} = expr::trans_to_datum(bcx, expr);
         match ty::get(datum.ty).sty {
             ty::ty_bare_fn(*) => {
@@ -115,7 +115,7 @@ pub fn trans(bcx: @mut Block, expr: @ast::Expr) -> Callee {
         return Callee {bcx: bcx, data: Fn(fd)};
     }
 
-    fn trans_def(bcx: @mut Block, def: ast::Def, ref_expr: @ast::Expr) -> Callee {
+    fn trans_def(bcx: @mut Block, def: ast::Def, ref_expr: &ast::Expr) -> Callee {
         match def {
             ast::DefFn(did, _) |
             ast::DefStaticMethod(did, ast::FromImpl(_), _) => {
@@ -447,8 +447,8 @@ pub fn trans_fn_ref_with_vtables(
 // Translating calls
 
 pub fn trans_call(in_cx: @mut Block,
-                  call_ex: @ast::Expr,
-                  f: @ast::Expr,
+                  call_ex: &ast::Expr,
+                  f: &ast::Expr,
                   args: CallArgs,
                   id: ast::NodeId,
                   dest: expr::Dest)
@@ -465,9 +465,9 @@ pub fn trans_call(in_cx: @mut Block,
 }
 
 pub fn trans_method_call(in_cx: @mut Block,
-                         call_ex: @ast::Expr,
+                         call_ex: &ast::Expr,
                          callee_id: ast::NodeId,
-                         rcvr: @ast::Expr,
+                         rcvr: &ast::Expr,
                          args: CallArgs,
                          dest: expr::Dest)
                          -> @mut Block {
@@ -834,7 +834,7 @@ pub enum AutorefArg {
 pub fn trans_arg_expr(bcx: @mut Block,
                       formal_arg_ty: ty::t,
                       self_mode: ty::SelfMode,
-                      arg_expr: @ast::Expr,
+                      arg_expr: &ast::Expr,
                       temp_cleanups: &mut ~[ValueRef],
                       autoref_arg: AutorefArg) -> Result {
     let _icx = push_ctxt("trans_arg_expr");
diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index 377144b38e7..5f85a4f9385 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -670,7 +670,7 @@ impl Block {
         ast_map::node_id_to_str(self.tcx().items, id, self.sess().intr())
     }
 
-    pub fn expr_to_str(&self, e: @ast::Expr) -> ~str {
+    pub fn expr_to_str(&self, e: &ast::Expr) -> ~str {
         e.repr(self.tcx())
     }
 
diff --git a/src/librustc/middle/trans/consts.rs b/src/librustc/middle/trans/consts.rs
index a7a04627981..7d208c896b7 100644
--- a/src/librustc/middle/trans/consts.rs
+++ b/src/librustc/middle/trans/consts.rs
@@ -177,7 +177,7 @@ pub fn get_const_val(cx: @mut CrateContext,
      !cx.non_inlineable_statics.contains(&def_id.node))
 }
 
-pub fn const_expr(cx: @mut CrateContext, e: @ast::Expr) -> (ValueRef, bool) {
+pub fn const_expr(cx: @mut CrateContext, e: &ast::Expr) -> (ValueRef, bool) {
     let (llconst, inlineable) = const_expr_unadjusted(cx, e);
     let mut llconst = llconst;
     let mut inlineable = inlineable;
diff --git a/src/librustc/middle/trans/controlflow.rs b/src/librustc/middle/trans/controlflow.rs
index bfa7beace8c..73e7a6745fb 100644
--- a/src/librustc/middle/trans/controlflow.rs
+++ b/src/librustc/middle/trans/controlflow.rs
@@ -45,7 +45,7 @@ pub fn trans_block(bcx: @mut Block, b: &ast::Block, dest: expr::Dest) -> @mut Bl
 }
 
 pub fn trans_if(bcx: @mut Block,
-            cond: @ast::Expr,
+            cond: &ast::Expr,
             thn: &ast::Block,
             els: Option<@ast::Expr>,
             dest: expr::Dest)
@@ -158,7 +158,7 @@ pub fn join_blocks(parent_bcx: @mut Block, in_cxs: &[@mut Block]) -> @mut Block
     return out;
 }
 
-pub fn trans_while(bcx: @mut Block, cond: @ast::Expr, body: &ast::Block) -> @mut Block {
+pub fn trans_while(bcx: @mut Block, cond: &ast::Expr, body: &ast::Block) -> @mut Block {
     let _icx = push_ctxt("trans_while");
     let next_bcx = sub_block(bcx, "while next");
 
diff --git a/src/librustc/middle/trans/expr.rs b/src/librustc/middle/trans/expr.rs
index 01702e749a3..56677167f0e 100644
--- a/src/librustc/middle/trans/expr.rs
+++ b/src/librustc/middle/trans/expr.rs
@@ -181,7 +181,7 @@ fn drop_and_cancel_clean(bcx: @mut Block, dat: Datum) -> @mut Block {
     return bcx;
 }
 
-pub fn trans_to_datum(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
+pub fn trans_to_datum(bcx: @mut Block, expr: &ast::Expr) -> DatumBlock {
     debug!("trans_to_datum(expr=%s)", bcx.expr_to_str(expr));
 
     let mut bcx = bcx;
@@ -307,7 +307,7 @@ pub fn trans_to_datum(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
 
     fn auto_borrow_obj(mut bcx: @mut Block,
                        autoderefs: uint,
-                       expr: @ast::Expr,
+                       expr: &ast::Expr,
                        source_datum: Datum) -> DatumBlock {
         let tcx = bcx.tcx();
         let target_obj_ty = expr_ty_adjusted(bcx, expr);
@@ -419,7 +419,7 @@ pub fn trans_to_datum(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
     }
 }
 
-pub fn trans_into(bcx: @mut Block, expr: @ast::Expr, dest: Dest) -> @mut Block {
+pub fn trans_into(bcx: @mut Block, expr: &ast::Expr, dest: Dest) -> @mut Block {
     if bcx.tcx().adjustments.contains_key(&expr.id) {
         // use trans_to_datum, which is mildly less efficient but
         // which will perform the adjustments:
@@ -477,7 +477,7 @@ pub fn trans_into(bcx: @mut Block, expr: @ast::Expr, dest: Dest) -> @mut Block {
     };
 }
 
-fn trans_lvalue(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
+fn trans_lvalue(bcx: @mut Block, expr: &ast::Expr) -> DatumBlock {
     /*!
      *
      * Translates an lvalue expression, always yielding a by-ref
@@ -496,7 +496,7 @@ fn trans_lvalue(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
     };
 }
 
-fn trans_to_datum_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
+fn trans_to_datum_unadjusted(bcx: @mut Block, expr: &ast::Expr) -> DatumBlock {
     /*!
      * Translates an expression into a datum.  If this expression
      * is an rvalue, this will result in a temporary value being
@@ -562,7 +562,7 @@ fn trans_to_datum_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
     }
 }
 
-fn trans_rvalue_datum_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
+fn trans_rvalue_datum_unadjusted(bcx: @mut Block, expr: &ast::Expr) -> DatumBlock {
     let _icx = push_ctxt("trans_rvalue_datum_unadjusted");
 
     trace_span!(bcx, expr.span, shorten(bcx.expr_to_str(expr)));
@@ -615,7 +615,7 @@ fn trans_rvalue_datum_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> DatumBloc
     }
 }
 
-fn trans_rvalue_stmt_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> @mut Block {
+fn trans_rvalue_stmt_unadjusted(bcx: @mut Block, expr: &ast::Expr) -> @mut Block {
     let mut bcx = bcx;
     let _icx = push_ctxt("trans_rvalue_stmt");
 
@@ -669,7 +669,7 @@ fn trans_rvalue_stmt_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> @mut Block
     };
 }
 
-fn trans_rvalue_dps_unadjusted(bcx: @mut Block, expr: @ast::Expr,
+fn trans_rvalue_dps_unadjusted(bcx: @mut Block, expr: &ast::Expr,
                                dest: Dest) -> @mut Block {
     let _icx = push_ctxt("trans_rvalue_dps_unadjusted");
     let tcx = bcx.tcx();
@@ -878,7 +878,7 @@ fn trans_def_datum_unadjusted(bcx: @mut Block,
     }
 }
 
-fn trans_lvalue_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
+fn trans_lvalue_unadjusted(bcx: @mut Block, expr: &ast::Expr) -> DatumBlock {
     /*!
      *
      * Translates an lvalue expression, always yielding a by-ref
@@ -918,7 +918,7 @@ fn trans_lvalue_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
     };
 
     fn trans_rec_field(bcx: @mut Block,
-                       base: @ast::Expr,
+                       base: &ast::Expr,
                        field: ast::Ident) -> DatumBlock {
         //! Translates `base.field`.
 
@@ -942,8 +942,8 @@ fn trans_lvalue_unadjusted(bcx: @mut Block, expr: @ast::Expr) -> DatumBlock {
 
     fn trans_index(bcx: @mut Block,
                    index_expr: &ast::Expr,
-                   base: @ast::Expr,
-                   idx: @ast::Expr) -> DatumBlock {
+                   base: &ast::Expr,
+                   idx: &ast::Expr) -> DatumBlock {
         //! Translates `base[idx]`.
 
         let _icx = push_ctxt("trans_index");
@@ -1321,7 +1321,7 @@ fn trans_adt(bcx: @mut Block, repr: &adt::Repr, discr: ty::Disr,
 }
 
 
-fn trans_immediate_lit(bcx: @mut Block, expr: @ast::Expr,
+fn trans_immediate_lit(bcx: @mut Block, expr: &ast::Expr,
                        lit: ast::lit) -> DatumBlock {
     // must not be a string constant, that is a RvalueDpsExpr
     let _icx = push_ctxt("trans_immediate_lit");
@@ -1332,7 +1332,7 @@ fn trans_immediate_lit(bcx: @mut Block, expr: @ast::Expr,
 fn trans_unary_datum(bcx: @mut Block,
                      un_expr: &ast::Expr,
                      op: ast::UnOp,
-                     sub_expr: @ast::Expr) -> DatumBlock {
+                     sub_expr: &ast::Expr) -> DatumBlock {
     let _icx = push_ctxt("trans_unary_datum");
 
     // if deref, would be LvalueExpr
@@ -1391,7 +1391,7 @@ fn trans_unary_datum(bcx: @mut Block,
 
     fn trans_boxed_expr(bcx: @mut Block,
                         box_ty: ty::t,
-                        contents: @ast::Expr,
+                        contents: &ast::Expr,
                         contents_ty: ty::t,
                         heap: heap) -> DatumBlock {
         let _icx = push_ctxt("trans_boxed_expr");
@@ -1416,7 +1416,7 @@ fn trans_unary_datum(bcx: @mut Block,
 }
 
 fn trans_addr_of(bcx: @mut Block, expr: &ast::Expr,
-                 subexpr: @ast::Expr) -> DatumBlock {
+                 subexpr: &ast::Expr) -> DatumBlock {
     let _icx = push_ctxt("trans_addr_of");
     let mut bcx = bcx;
     let sub_datum = unpack_datum!(bcx, trans_to_datum(bcx, subexpr));
@@ -1532,8 +1532,8 @@ enum lazy_binop_ty { lazy_and, lazy_or }
 fn trans_lazy_binop(bcx: @mut Block,
                     binop_expr: &ast::Expr,
                     op: lazy_binop_ty,
-                    a: @ast::Expr,
-                    b: @ast::Expr) -> DatumBlock {
+                    a: &ast::Expr,
+                    b: &ast::Expr) -> DatumBlock {
     let _icx = push_ctxt("trans_lazy_binop");
     let binop_ty = expr_ty(bcx, binop_expr);
     let bcx = bcx;
@@ -1577,8 +1577,8 @@ fn trans_lazy_binop(bcx: @mut Block,
 fn trans_binary(bcx: @mut Block,
                 binop_expr: &ast::Expr,
                 op: ast::BinOp,
-                lhs: @ast::Expr,
-                rhs: @ast::Expr) -> DatumBlock
+                lhs: &ast::Expr,
+                rhs: &ast::Expr) -> DatumBlock
 {
     let _icx = push_ctxt("trans_binary");
 
@@ -1603,7 +1603,7 @@ fn trans_binary(bcx: @mut Block,
 fn trans_overloaded_op(bcx: @mut Block,
                        expr: &ast::Expr,
                        callee_id: ast::NodeId,
-                       rcvr: @ast::Expr,
+                       rcvr: &ast::Expr,
                        args: ~[@ast::Expr],
                        ret_ty: ty::t,
                        dest: Dest)
@@ -1679,7 +1679,7 @@ pub fn cast_type_kind(t: ty::t) -> cast_kind {
     }
 }
 
-fn trans_imm_cast(bcx: @mut Block, expr: @ast::Expr,
+fn trans_imm_cast(bcx: @mut Block, expr: &ast::Expr,
                   id: ast::NodeId) -> DatumBlock {
     let _icx = push_ctxt("trans_cast");
     let ccx = bcx.ccx();
@@ -1748,10 +1748,10 @@ fn trans_imm_cast(bcx: @mut Block, expr: @ast::Expr,
 }
 
 fn trans_assign_op(bcx: @mut Block,
-                   expr: @ast::Expr,
+                   expr: &ast::Expr,
                    callee_id: ast::NodeId,
                    op: ast::BinOp,
-                   dst: @ast::Expr,
+                   dst: &ast::Expr,
                    src: @ast::Expr) -> @mut Block
 {
     let _icx = push_ctxt("trans_assign_op");
diff --git a/src/librustc/middle/trans/meth.rs b/src/librustc/middle/trans/meth.rs
index ce4c1011e80..19e2e1d00f6 100644
--- a/src/librustc/middle/trans/meth.rs
+++ b/src/librustc/middle/trans/meth.rs
@@ -139,7 +139,7 @@ pub fn trans_method(ccx: @mut CrateContext,
 }
 
 pub fn trans_self_arg(bcx: @mut Block,
-                      base: @ast::Expr,
+                      base: &ast::Expr,
                       temp_cleanups: &mut ~[ValueRef],
                       mentry: typeck::method_map_entry) -> Result {
     let _icx = push_ctxt("impl::trans_self_arg");
@@ -156,7 +156,7 @@ pub fn trans_self_arg(bcx: @mut Block,
 
 pub fn trans_method_callee(bcx: @mut Block,
                            callee_id: ast::NodeId,
-                           this: @ast::Expr,
+                           this: &ast::Expr,
                            mentry: typeck::method_map_entry)
                            -> Callee {
     let _icx = push_ctxt("impl::trans_method_callee");
@@ -313,7 +313,7 @@ pub fn method_with_name(ccx: &mut CrateContext,
 
 pub fn trans_monomorphized_callee(bcx: @mut Block,
                                   callee_id: ast::NodeId,
-                                  base: @ast::Expr,
+                                  base: &ast::Expr,
                                   mentry: typeck::method_map_entry,
                                   trait_id: ast::DefId,
                                   n_method: uint,
@@ -420,7 +420,7 @@ pub fn combine_impl_and_methods_tps(bcx: @mut Block,
 pub fn trans_trait_callee(bcx: @mut Block,
                           callee_id: ast::NodeId,
                           n_method: uint,
-                          self_expr: @ast::Expr)
+                          self_expr: &ast::Expr)
                           -> Callee {
     /*!
      * Create a method callee where the method is coming from a trait
@@ -630,7 +630,7 @@ fn emit_vtable_methods(bcx: @mut Block,
 }
 
 pub fn trans_trait_cast(bcx: @mut Block,
-                        val: @ast::Expr,
+                        val: &ast::Expr,
                         id: ast::NodeId,
                         dest: expr::Dest,
                         _store: ty::TraitStore)
diff --git a/src/librustc/middle/trans/tvec.rs b/src/librustc/middle/trans/tvec.rs
index e38831cd5d7..6a9b2217266 100644
--- a/src/librustc/middle/trans/tvec.rs
+++ b/src/librustc/middle/trans/tvec.rs
@@ -158,7 +158,7 @@ impl VecTypes {
 }
 
 pub fn trans_fixed_vstore(bcx: @mut Block,
-                          vstore_expr: @ast::Expr,
+                          vstore_expr: &ast::Expr,
                           content_expr: &ast::Expr,
                           dest: expr::Dest)
                        -> @mut Block {
@@ -187,8 +187,8 @@ pub fn trans_fixed_vstore(bcx: @mut Block,
 }
 
 pub fn trans_slice_vstore(bcx: @mut Block,
-                          vstore_expr: @ast::Expr,
-                          content_expr: @ast::Expr,
+                          vstore_expr: &ast::Expr,
+                          content_expr: &ast::Expr,
                           dest: expr::Dest)
                        -> @mut Block {
     //!
@@ -246,7 +246,7 @@ pub fn trans_slice_vstore(bcx: @mut Block,
 }
 
 pub fn trans_lit_str(bcx: @mut Block,
-                     lit_expr: @ast::Expr,
+                     lit_expr: &ast::Expr,
                      str_lit: @str,
                      dest: Dest)
                   -> @mut Block {
@@ -280,7 +280,7 @@ pub fn trans_lit_str(bcx: @mut Block,
 }
 
 
-pub fn trans_uniq_or_managed_vstore(bcx: @mut Block, heap: heap, vstore_expr: @ast::Expr,
+pub fn trans_uniq_or_managed_vstore(bcx: @mut Block, heap: heap, vstore_expr: &ast::Expr,
                                     content_expr: &ast::Expr) -> DatumBlock {
     //!
     //
@@ -343,7 +343,7 @@ pub fn trans_uniq_or_managed_vstore(bcx: @mut Block, heap: heap, vstore_expr: @a
 
 pub fn write_content(bcx: @mut Block,
                      vt: &VecTypes,
-                     vstore_expr: @ast::Expr,
+                     vstore_expr: &ast::Expr,
                      content_expr: &ast::Expr,
                      dest: Dest)
                   -> @mut Block {