1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use rustc_data_structures::indexed_vec::Idx;
13 use rustc_const_math::ConstInt;
16 use hair::cx::to_ref::ToRef;
17 use rustc::hir::def::{Def, CtorKind};
18 use rustc::middle::const_val::ConstVal;
19 use rustc::ty::{self, AdtKind, VariantDef, Ty};
20 use rustc::ty::adjustment::{Adjustment, Adjust, AutoBorrow};
21 use rustc::ty::cast::CastKind as TyCastKind;
24 impl<'tcx> Mirror<'tcx> for &'tcx hir::Expr {
25 type Output = Expr<'tcx>;
27 fn make_mirror<'a, 'gcx>(self, cx: &mut Cx<'a, 'gcx, 'tcx>) -> Expr<'tcx> {
28 let temp_lifetime = cx.region_maps.temporary_scope(self.id);
29 let expr_extent = CodeExtent::Misc(self.id);
31 debug!("Expr::make_mirror(): id={}, span={:?}", self.id, self.span);
33 let mut expr = make_mirror_unadjusted(cx, self);
35 // Now apply adjustments, if any.
36 for adjustment in cx.tables().expr_adjustments(self) {
37 debug!("make_mirror: expr={:?} applying adjustment={:?}",
40 expr = apply_adjustment(cx, self, expr, adjustment);
43 // Next, wrap this up in the expr's scope.
45 temp_lifetime: temp_lifetime,
48 kind: ExprKind::Scope {
54 // Finally, create a destruction scope, if any.
55 if let Some(extent) = cx.region_maps.opt_destruction_extent(self.id) {
57 temp_lifetime: temp_lifetime,
60 kind: ExprKind::Scope {
72 fn apply_adjustment<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
73 hir_expr: &'tcx hir::Expr,
75 adjustment: &Adjustment<'tcx>)
77 let Expr { temp_lifetime, span, .. } = expr;
78 let kind = match adjustment.kind {
79 Adjust::ReifyFnPointer => {
80 ExprKind::ReifyFnPointer { source: expr.to_ref() }
82 Adjust::UnsafeFnPointer => {
83 ExprKind::UnsafeFnPointer { source: expr.to_ref() }
85 Adjust::ClosureFnPointer => {
86 ExprKind::ClosureFnPointer { source: expr.to_ref() }
88 Adjust::NeverToAny => {
89 ExprKind::NeverToAny { source: expr.to_ref() }
91 Adjust::MutToConstPointer => {
92 ExprKind::Cast { source: expr.to_ref() }
94 Adjust::Deref(None) => {
95 ExprKind::Deref { arg: expr.to_ref() }
97 Adjust::Deref(Some(deref)) => {
98 let call = deref.method_call(cx.tcx, expr.ty);
102 ty: cx.tcx.mk_ref(deref.region,
108 kind: ExprKind::Borrow {
109 region: deref.region,
110 borrow_kind: to_borrow_kind(deref.mutbl),
115 overloaded_lvalue(cx, hir_expr, adjustment.target, Some(call), vec![expr.to_ref()])
117 Adjust::Borrow(AutoBorrow::Ref(r, m)) => {
120 borrow_kind: to_borrow_kind(m),
124 Adjust::Borrow(AutoBorrow::RawPtr(m)) => {
125 // Convert this to a suitable `&foo` and
126 // then an unsafe coercion. Limit the region to be just this
128 let region = ty::ReScope(CodeExtent::Misc(hir_expr.id));
129 let region = cx.tcx.mk_region(region);
132 ty: cx.tcx.mk_ref(region,
138 kind: ExprKind::Borrow {
140 borrow_kind: to_borrow_kind(m),
144 ExprKind::Cast { source: expr.to_ref() }
147 ExprKind::Unsize { source: expr.to_ref() }
153 ty: adjustment.target,
159 fn make_mirror_unadjusted<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
160 expr: &'tcx hir::Expr)
162 let expr_ty = cx.tables().expr_ty(expr);
163 let temp_lifetime = cx.region_maps.temporary_scope(expr.id);
165 let kind = match expr.node {
166 // Here comes the interesting stuff:
167 hir::ExprMethodCall(.., ref args) => {
168 // Rewrite a.b(c) into UFCS form like Trait::b(a, c)
169 let expr = method_callee(cx, expr, None);
170 let args = args.iter()
180 hir::ExprCall(ref fun, ref args) => {
181 if cx.tables().is_method_call(expr) {
182 // The callee is something implementing Fn, FnMut, or FnOnce.
183 // Find the actual method implementation being called and
184 // build the appropriate UFCS call expression with the
185 // callee-object as expr parameter.
187 // rewrite f(u, v) into FnOnce::call_once(f, (u, v))
189 let method = method_callee(cx, expr, None);
191 let arg_tys = args.iter().map(|e| cx.tables().expr_ty_adjusted(e));
192 let tupled_args = Expr {
193 ty: cx.tcx.mk_tup(arg_tys, false),
194 temp_lifetime: temp_lifetime,
196 kind: ExprKind::Tuple { fields: args.iter().map(ToRef::to_ref).collect() },
201 fun: method.to_ref(),
202 args: vec![fun.to_ref(), tupled_args.to_ref()],
205 let adt_data = if let hir::ExprPath(hir::QPath::Resolved(_, ref path)) = fun.node {
206 // Tuple-like ADTs are represented as ExprCall. We convert them here.
207 expr_ty.ty_adt_def().and_then(|adt_def| {
209 Def::VariantCtor(variant_id, CtorKind::Fn) => {
210 Some((adt_def, adt_def.variant_index_with_id(variant_id)))
212 Def::StructCtor(_, CtorKind::Fn) => Some((adt_def, 0)),
219 if let Some((adt_def, index)) = adt_data {
220 let substs = cx.tables().node_substs(fun.hir_id);
221 let field_refs = args.iter()
225 name: Field::new(idx),
233 variant_index: index,
239 ty: cx.tables().node_id_to_type(fun.hir_id),
247 hir::ExprAddrOf(mutbl, ref expr) => {
248 let region = match expr_ty.sty {
249 ty::TyRef(r, _) => r,
250 _ => span_bug!(expr.span, "type of & not region"),
254 borrow_kind: to_borrow_kind(mutbl),
259 hir::ExprBlock(ref blk) => ExprKind::Block { body: &blk },
261 hir::ExprAssign(ref lhs, ref rhs) => {
268 hir::ExprAssignOp(op, ref lhs, ref rhs) => {
269 if cx.tables().is_method_call(expr) {
270 overloaded_operator(cx, expr, vec![lhs.to_ref(), rhs.to_ref()])
280 hir::ExprLit(..) => ExprKind::Literal { literal: cx.const_eval_literal(expr) },
282 hir::ExprBinary(op, ref lhs, ref rhs) => {
283 if cx.tables().is_method_call(expr) {
284 overloaded_operator(cx, expr, vec![lhs.to_ref(), rhs.to_ref()])
287 match (op.node, cx.constness) {
288 // FIXME(eddyb) use logical ops in constants when
289 // they can handle that kind of control-flow.
290 (hir::BinOp_::BiAnd, hir::Constness::Const) => {
297 (hir::BinOp_::BiOr, hir::Constness::Const) => {
305 (hir::BinOp_::BiAnd, hir::Constness::NotConst) => {
306 ExprKind::LogicalOp {
312 (hir::BinOp_::BiOr, hir::Constness::NotConst) => {
313 ExprKind::LogicalOp {
321 let op = bin_op(op.node);
332 hir::ExprIndex(ref lhs, ref index) => {
333 if cx.tables().is_method_call(expr) {
334 overloaded_lvalue(cx, expr, expr_ty, None, vec![lhs.to_ref(), index.to_ref()])
338 index: index.to_ref(),
343 hir::ExprUnary(hir::UnOp::UnDeref, ref arg) => {
344 if cx.tables().is_method_call(expr) {
345 overloaded_lvalue(cx, expr, expr_ty, None, vec![arg.to_ref()])
347 ExprKind::Deref { arg: arg.to_ref() }
351 hir::ExprUnary(hir::UnOp::UnNot, ref arg) => {
352 if cx.tables().is_method_call(expr) {
353 overloaded_operator(cx, expr, vec![arg.to_ref()])
362 hir::ExprUnary(hir::UnOp::UnNeg, ref arg) => {
363 if cx.tables().is_method_call(expr) {
364 overloaded_operator(cx, expr, vec![arg.to_ref()])
366 // FIXME runtime-overflow
367 if let hir::ExprLit(_) = arg.node {
368 ExprKind::Literal { literal: cx.const_eval_literal(expr) }
378 hir::ExprStruct(ref qpath, ref fields, ref base) => {
380 ty::TyAdt(adt, substs) => {
381 match adt.adt_kind() {
382 AdtKind::Struct | AdtKind::Union => {
383 let field_refs = field_refs(&adt.variants[0], fields);
389 base: base.as_ref().map(|base| {
390 cx.tables().validate_hir_id(expr.hir_id);
393 field_types: cx.tables()
394 .fru_field_types[&expr.hir_id.local_id]
401 let def = match *qpath {
402 hir::QPath::Resolved(_, ref path) => path.def,
403 hir::QPath::TypeRelative(..) => Def::Err,
406 Def::Variant(variant_id) => {
407 assert!(base.is_none());
409 let index = adt.variant_index_with_id(variant_id);
410 let field_refs = field_refs(&adt.variants[index], fields);
413 variant_index: index,
420 span_bug!(expr.span, "unexpected def: {:?}", def);
428 "unexpected type for struct literal: {:?}",
434 hir::ExprClosure(..) => {
435 let closure_ty = cx.tables().expr_ty(expr);
436 let (def_id, substs) = match closure_ty.sty {
437 ty::TyClosure(def_id, substs) => (def_id, substs),
439 span_bug!(expr.span, "closure expr w/o closure type: {:?}", closure_ty);
442 let upvars = cx.tcx.with_freevars(expr.id, |freevars| {
444 .zip(substs.upvar_tys(def_id, cx.tcx))
445 .map(|(fv, ty)| capture_freevar(cx, expr, fv, ty))
455 hir::ExprPath(ref qpath) => {
456 let def = cx.tables().qpath_def(qpath, expr.hir_id);
457 convert_path_expr(cx, expr, def)
460 hir::ExprInlineAsm(ref asm, ref outputs, ref inputs) => {
461 ExprKind::InlineAsm {
463 outputs: outputs.to_ref(),
464 inputs: inputs.to_ref(),
468 // Now comes the rote stuff:
469 hir::ExprRepeat(ref v, count) => {
470 let c = &cx.tcx.hir.body(count).value;
471 let def_id = cx.tcx.hir.body_owner_def_id(count);
472 let substs = Substs::identity_for_item(cx.tcx.global_tcx(), def_id);
473 let count = match cx.tcx.at(c.span).const_eval(cx.param_env.and((def_id, substs))) {
474 Ok(ConstVal::Integral(ConstInt::Usize(u))) => u,
475 Ok(other) => bug!("constant evaluation of repeat count yielded {:?}", other),
476 Err(s) => cx.fatal_const_eval_err(&s, c.span, "expression")
484 hir::ExprRet(ref v) => ExprKind::Return { value: v.to_ref() },
485 hir::ExprBreak(dest, ref value) => {
486 match dest.target_id {
487 hir::ScopeTarget::Block(target_id) |
488 hir::ScopeTarget::Loop(hir::LoopIdResult::Ok(target_id)) => ExprKind::Break {
489 label: CodeExtent::Misc(target_id),
490 value: value.to_ref(),
492 hir::ScopeTarget::Loop(hir::LoopIdResult::Err(err)) =>
493 bug!("invalid loop id for break: {}", err)
496 hir::ExprAgain(dest) => {
497 match dest.target_id {
498 hir::ScopeTarget::Block(_) => bug!("cannot continue to blocks"),
499 hir::ScopeTarget::Loop(hir::LoopIdResult::Ok(loop_id)) => ExprKind::Continue {
500 label: CodeExtent::Misc(loop_id),
502 hir::ScopeTarget::Loop(hir::LoopIdResult::Err(err)) =>
503 bug!("invalid loop id for continue: {}", err)
506 hir::ExprMatch(ref discr, ref arms, _) => {
508 discriminant: discr.to_ref(),
509 arms: arms.iter().map(|a| convert_arm(cx, a)).collect(),
512 hir::ExprIf(ref cond, ref then, ref otherwise) => {
514 condition: cond.to_ref(),
516 otherwise: otherwise.to_ref(),
519 hir::ExprWhile(ref cond, ref body, _) => {
521 condition: Some(cond.to_ref()),
522 body: block::to_expr_ref(cx, body),
525 hir::ExprLoop(ref body, _, _) => {
528 body: block::to_expr_ref(cx, body),
531 hir::ExprField(ref source, name) => {
532 let index = match cx.tables().expr_ty_adjusted(source).sty {
533 ty::TyAdt(adt_def, _) => adt_def.variants[0].index_of_field_named(name.node),
534 ref ty => span_bug!(expr.span, "field of non-ADT: {:?}", ty),
537 index.unwrap_or_else(|| {
538 span_bug!(expr.span, "no index found for field `{}`", name.node)
541 lhs: source.to_ref(),
542 name: Field::new(index),
545 hir::ExprTupField(ref source, index) => {
547 lhs: source.to_ref(),
548 name: Field::new(index.node as usize),
551 hir::ExprCast(ref source, _) => {
552 // Check to see if this cast is a "coercion cast", where the cast is actually done
553 // using a coercion (or is a no-op).
554 if let Some(&TyCastKind::CoercionCast) = cx.tables().cast_kinds.get(&source.id) {
555 // Convert the lexpr to a vexpr.
556 ExprKind::Use { source: source.to_ref() }
558 ExprKind::Cast { source: source.to_ref() }
561 hir::ExprType(ref source, _) => return source.make_mirror(cx),
562 hir::ExprBox(ref value) => {
564 value: value.to_ref(),
565 value_extents: CodeExtent::Misc(value.id),
568 hir::ExprArray(ref fields) => ExprKind::Array { fields: fields.to_ref() },
569 hir::ExprTup(ref fields) => ExprKind::Tuple { fields: fields.to_ref() },
573 temp_lifetime: temp_lifetime,
580 fn method_callee<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
582 custom_callee: Option<(DefId, &'tcx Substs<'tcx>)>)
584 let temp_lifetime = cx.region_maps.temporary_scope(expr.id);
585 let (def_id, substs) = custom_callee.unwrap_or_else(|| {
586 cx.tables().validate_hir_id(expr.hir_id);
587 (cx.tables().type_dependent_defs[&expr.hir_id.local_id].def_id(),
588 cx.tables().node_substs(expr.hir_id))
591 temp_lifetime: temp_lifetime,
592 ty: cx.tcx().mk_fn_def(def_id, substs),
594 kind: ExprKind::Literal {
595 literal: Literal::Value {
596 value: ConstVal::Function(def_id, substs),
602 fn to_borrow_kind(m: hir::Mutability) -> BorrowKind {
604 hir::MutMutable => BorrowKind::Mut,
605 hir::MutImmutable => BorrowKind::Shared,
609 fn convert_arm<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>, arm: &'tcx hir::Arm) -> Arm<'tcx> {
611 patterns: arm.pats.iter().map(|p| {
612 Pattern::from_hir(cx.tcx.global_tcx(),
613 cx.param_env.and(cx.identity_substs),
617 guard: arm.guard.to_ref(),
618 body: arm.body.to_ref(),
622 fn convert_path_expr<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
623 expr: &'tcx hir::Expr,
626 let substs = cx.tables().node_substs(expr.hir_id);
628 // A regular function, constructor function or a constant.
630 Def::Method(def_id) |
631 Def::StructCtor(def_id, CtorKind::Fn) |
632 Def::VariantCtor(def_id, CtorKind::Fn) => ExprKind::Literal {
633 literal: Literal::Value {
634 value: ConstVal::Function(def_id, substs),
639 Def::AssociatedConst(def_id) => ExprKind::Literal {
640 literal: Literal::Item {
646 Def::StructCtor(def_id, CtorKind::Const) |
647 Def::VariantCtor(def_id, CtorKind::Const) => {
648 match cx.tables().node_id_to_type(expr.hir_id).sty {
649 // A unit struct/variant which is used as a value.
650 // We return a completely different ExprKind here to account for this special case.
651 ty::TyAdt(adt_def, substs) => {
654 variant_index: adt_def.variant_index_with_id(def_id),
660 ref sty => bug!("unexpected sty: {:?}", sty),
664 Def::Static(node_id, _) => ExprKind::StaticRef { id: node_id },
666 Def::Local(..) | Def::Upvar(..) => convert_var(cx, expr, def),
668 _ => span_bug!(expr.span, "def `{:?}` not yet implemented", def),
672 fn convert_var<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
673 expr: &'tcx hir::Expr,
676 let temp_lifetime = cx.region_maps.temporary_scope(expr.id);
679 Def::Local(def_id) => {
680 let node_id = cx.tcx.hir.as_local_node_id(def_id).unwrap();
681 ExprKind::VarRef { id: node_id }
684 Def::Upvar(def_id, index, closure_expr_id) => {
685 let id_var = cx.tcx.hir.as_local_node_id(def_id).unwrap();
686 debug!("convert_var(upvar({:?}, {:?}, {:?}))",
690 let var_ty = cx.tables()
691 .node_id_to_type(cx.tcx.hir.node_to_hir_id(id_var));
693 // FIXME free regions in closures are not right
694 let closure_ty = cx.tables()
695 .node_id_to_type(cx.tcx.hir.node_to_hir_id(closure_expr_id));
697 // FIXME we're just hard-coding the idea that the
698 // signature will be &self or &mut self and hence will
699 // have a bound region with number 0
700 let closure_def_id = cx.tcx.hir.local_def_id(closure_expr_id);
701 let region = ty::ReFree(ty::FreeRegion {
702 scope: closure_def_id,
703 bound_region: ty::BoundRegion::BrAnon(0),
705 let region = cx.tcx.mk_region(region);
707 let self_expr = match cx.tcx.closure_kind(closure_def_id) {
708 ty::ClosureKind::Fn => {
709 let ref_closure_ty = cx.tcx.mk_ref(region,
712 mutbl: hir::MutImmutable,
716 temp_lifetime: temp_lifetime,
718 kind: ExprKind::Deref {
721 temp_lifetime: temp_lifetime,
723 kind: ExprKind::SelfRef,
729 ty::ClosureKind::FnMut => {
730 let ref_closure_ty = cx.tcx.mk_ref(region,
733 mutbl: hir::MutMutable,
737 temp_lifetime: temp_lifetime,
739 kind: ExprKind::Deref {
742 temp_lifetime: temp_lifetime,
744 kind: ExprKind::SelfRef,
749 ty::ClosureKind::FnOnce => {
752 temp_lifetime: temp_lifetime,
754 kind: ExprKind::SelfRef,
759 // at this point we have `self.n`, which loads up the upvar
760 let field_kind = ExprKind::Field {
761 lhs: self_expr.to_ref(),
762 name: Field::new(index),
765 // ...but the upvar might be an `&T` or `&mut T` capture, at which
766 // point we need an implicit deref
767 let upvar_id = ty::UpvarId {
769 closure_expr_id: closure_expr_id,
771 match cx.tables().upvar_capture(upvar_id) {
772 ty::UpvarCapture::ByValue => field_kind,
773 ty::UpvarCapture::ByRef(borrow) => {
776 temp_lifetime: temp_lifetime,
777 ty: cx.tcx.mk_ref(borrow.region,
780 mutbl: borrow.kind.to_mutbl_lossy(),
790 _ => span_bug!(expr.span, "type of & not region"),
795 fn bin_op(op: hir::BinOp_) -> BinOp {
797 hir::BinOp_::BiAdd => BinOp::Add,
798 hir::BinOp_::BiSub => BinOp::Sub,
799 hir::BinOp_::BiMul => BinOp::Mul,
800 hir::BinOp_::BiDiv => BinOp::Div,
801 hir::BinOp_::BiRem => BinOp::Rem,
802 hir::BinOp_::BiBitXor => BinOp::BitXor,
803 hir::BinOp_::BiBitAnd => BinOp::BitAnd,
804 hir::BinOp_::BiBitOr => BinOp::BitOr,
805 hir::BinOp_::BiShl => BinOp::Shl,
806 hir::BinOp_::BiShr => BinOp::Shr,
807 hir::BinOp_::BiEq => BinOp::Eq,
808 hir::BinOp_::BiLt => BinOp::Lt,
809 hir::BinOp_::BiLe => BinOp::Le,
810 hir::BinOp_::BiNe => BinOp::Ne,
811 hir::BinOp_::BiGe => BinOp::Ge,
812 hir::BinOp_::BiGt => BinOp::Gt,
813 _ => bug!("no equivalent for ast binop {:?}", op),
817 fn overloaded_operator<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
818 expr: &'tcx hir::Expr,
819 args: Vec<ExprRef<'tcx>>)
821 let fun = method_callee(cx, expr, None);
829 fn overloaded_lvalue<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
830 expr: &'tcx hir::Expr,
832 custom_callee: Option<(DefId, &'tcx Substs<'tcx>)>,
833 args: Vec<ExprRef<'tcx>>)
835 // For an overloaded *x or x[y] expression of type T, the method
836 // call returns an &T and we must add the deref so that the types
837 // line up (this is because `*x` and `x[y]` represent lvalues):
839 let recv_ty = match args[0] {
840 ExprRef::Hair(e) => cx.tables().expr_ty_adjusted(e),
841 ExprRef::Mirror(ref e) => e.ty
844 // Reconstruct the output assuming it's a reference with the
845 // same region and mutability as the receiver. This holds for
846 // `Deref(Mut)::Deref(_mut)` and `Index(Mut)::index(_mut)`.
847 let (region, mt) = match recv_ty.sty {
848 ty::TyRef(region, mt) => (region, mt),
849 _ => span_bug!(expr.span, "overloaded_lvalue: receiver is not a reference"),
851 let ref_ty = cx.tcx.mk_ref(region, ty::TypeAndMut {
856 // construct the complete expression `foo()` for the overloaded call,
857 // which will yield the &T type
858 let temp_lifetime = cx.region_maps.temporary_scope(expr.id);
859 let fun = method_callee(cx, expr, custom_callee);
860 let ref_expr = Expr {
861 temp_lifetime: temp_lifetime,
864 kind: ExprKind::Call {
871 // construct and return a deref wrapper `*foo()`
872 ExprKind::Deref { arg: ref_expr.to_ref() }
875 fn capture_freevar<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
876 closure_expr: &'tcx hir::Expr,
877 freevar: &hir::Freevar,
878 freevar_ty: Ty<'tcx>)
880 let id_var = cx.tcx.hir.as_local_node_id(freevar.def.def_id()).unwrap();
881 let upvar_id = ty::UpvarId {
883 closure_expr_id: closure_expr.id,
885 let upvar_capture = cx.tables().upvar_capture(upvar_id);
886 let temp_lifetime = cx.region_maps.temporary_scope(closure_expr.id);
887 let var_ty = cx.tables()
888 .node_id_to_type(cx.tcx.hir.node_to_hir_id(id_var));
889 let captured_var = Expr {
890 temp_lifetime: temp_lifetime,
892 span: closure_expr.span,
893 kind: convert_var(cx, closure_expr, freevar.def),
895 match upvar_capture {
896 ty::UpvarCapture::ByValue => captured_var.to_ref(),
897 ty::UpvarCapture::ByRef(upvar_borrow) => {
898 let borrow_kind = match upvar_borrow.kind {
899 ty::BorrowKind::ImmBorrow => BorrowKind::Shared,
900 ty::BorrowKind::UniqueImmBorrow => BorrowKind::Unique,
901 ty::BorrowKind::MutBorrow => BorrowKind::Mut,
904 temp_lifetime: temp_lifetime,
906 span: closure_expr.span,
907 kind: ExprKind::Borrow {
908 region: upvar_borrow.region,
909 borrow_kind: borrow_kind,
910 arg: captured_var.to_ref(),
917 /// Converts a list of named fields (i.e. for struct-like struct/enum ADTs) into FieldExprRef.
918 fn field_refs<'tcx>(variant: &'tcx VariantDef,
919 fields: &'tcx [hir::Field])
920 -> Vec<FieldExprRef<'tcx>> {
924 name: Field::new(variant.index_of_field_named(field.name.node).unwrap()),
925 expr: field.expr.to_ref(),