1 // Copyright 2012 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.
11 use hir::def_id::DefId;
12 use hir::map::definitions::DefPathData;
13 use ty::subst::{self, Subst};
14 use ty::{BrAnon, BrEnv, BrFresh, BrNamed};
15 use ty::{TyBool, TyChar, TyAdt};
16 use ty::{TyError, TyStr, TyArray, TySlice, TyFloat, TyFnDef, TyFnPtr};
17 use ty::{TyParam, TyRawPtr, TyRef, TyNever, TyTuple};
18 use ty::{TyClosure, TyProjection, TyAnon};
19 use ty::{TyDynamic, TyInt, TyUint, TyInfer};
20 use ty::{self, Ty, TyCtxt, TypeFoldable};
27 use syntax::ast::CRATE_NODE_ID;
28 use syntax::symbol::Symbol;
31 pub fn verbose() -> bool {
32 ty::tls::with(|tcx| tcx.sess.verbose())
35 fn fn_sig(f: &mut fmt::Formatter,
41 let mut inputs = inputs.iter();
42 if let Some(&ty) = inputs.next() {
45 write!(f, ", {}", ty)?;
53 write!(f, " -> {}", output)?;
59 pub fn parameterized(f: &mut fmt::Formatter,
60 substs: &subst::Substs,
62 projections: &[ty::ProjectionPredicate])
64 let key = ty::tls::with(|tcx| tcx.def_key(did));
65 let mut item_name = if let Some(name) = key.disambiguated_data.data.get_opt_name() {
68 did.index = key.parent.unwrap_or_else(
69 || bug!("finding type for {:?}, encountered def-id {:?} with no parent",
71 parameterized(f, substs, did, projections)?;
72 return write!(f, "::{}", key.disambiguated_data.data.as_interned_str());
75 let mut verbose = false;
76 let mut num_supplied_defaults = 0;
77 let mut has_self = false;
78 let mut num_regions = 0;
79 let mut num_types = 0;
80 let mut is_value_path = false;
81 let fn_trait_kind = ty::tls::with(|tcx| {
82 // Unfortunately, some kinds of items (e.g., closures) don't have
83 // generics. So walk back up the find the closest parent that DOES
85 let mut item_def_id = did;
87 let key = tcx.def_key(item_def_id);
88 match key.disambiguated_data.data {
89 DefPathData::TypeNs(_) => {
92 DefPathData::ValueNs(_) | DefPathData::EnumVariant(_) => {
97 // if we're making a symbol for something, there ought
98 // to be a value or type-def or something in there
100 item_def_id.index = key.parent.unwrap_or_else(|| {
101 bug!("finding type for {:?}, encountered def-id {:?} with no \
102 parent", did, item_def_id);
107 let mut generics = tcx.generics_of(item_def_id);
108 let mut path_def_id = did;
109 verbose = tcx.sess.verbose();
110 has_self = generics.has_self;
112 let mut child_types = 0;
113 if let Some(def_id) = generics.parent {
115 assert!(is_value_path);
116 child_types = generics.types.len();
117 generics = tcx.generics_of(def_id);
118 num_regions = generics.regions.len();
119 num_types = generics.types.len();
122 write!(f, "<{} as ", substs.type_at(0))?;
125 path_def_id = def_id;
131 assert_eq!(has_self, false);
134 num_regions = generics.regions.len();
135 num_types = generics.types.len();
140 if generics.types.last().map_or(false, |def| def.has_default) {
141 if let Some(substs) = tcx.lift(&substs) {
142 let tps = substs.types().rev().skip(child_types);
143 for (def, actual) in generics.types.iter().rev().zip(tps) {
144 if !def.has_default {
147 if tcx.type_of(def.def_id).subst(tcx, substs) != actual {
150 num_supplied_defaults += 1;
156 write!(f, "{}", tcx.item_path_str(path_def_id))?;
157 Ok(tcx.lang_items.fn_trait_kind(path_def_id))
160 if !verbose && fn_trait_kind.is_some() && projections.len() == 1 {
161 let projection_ty = projections[0].ty;
162 if let TyTuple(ref args, _) = substs.type_at(1).sty {
163 return fn_sig(f, args, false, projection_ty);
167 let empty = Cell::new(true);
168 let start_or_continue = |f: &mut fmt::Formatter, start: &str, cont: &str| {
171 write!(f, "{}", start)
173 write!(f, "{}", cont)
177 let print_regions = |f: &mut fmt::Formatter, start: &str, skip, count| {
178 // Don't print any regions if they're all erased.
179 let regions = || substs.regions().skip(skip).take(count);
180 if regions().all(|r: ty::Region| *r == ty::ReErased) {
184 for region in regions() {
185 let region: ty::Region = region;
186 start_or_continue(f, start, ", ")?;
188 write!(f, "{:?}", region)?;
190 let s = region.to_string();
192 // This happens when the value of the region
193 // parameter is not easily serialized. This may be
194 // because the user omitted it in the first place,
195 // or because it refers to some block in the code,
196 // etc. I'm not sure how best to serialize this.
207 print_regions(f, "<", 0, num_regions)?;
209 let tps = substs.types().take(num_types - num_supplied_defaults)
210 .skip(has_self as usize);
213 start_or_continue(f, "<", ", ")?;
214 write!(f, "{}", ty)?;
217 for projection in projections {
218 start_or_continue(f, "<", ", ")?;
221 projection.projection_ty.item_name(tcx),
226 start_or_continue(f, "", ">")?;
228 // For values, also print their name and type parameters.
236 if let Some(item_name) = item_name {
237 write!(f, "::{}", item_name)?;
240 print_regions(f, "::<", num_regions, usize::MAX)?;
242 // FIXME: consider being smart with defaults here too
243 for ty in substs.types().skip(num_types) {
244 start_or_continue(f, "::<", ", ")?;
245 write!(f, "{}", ty)?;
248 start_or_continue(f, "", ">")?;
254 fn in_binder<'a, 'gcx, 'tcx, T, U>(f: &mut fmt::Formatter,
255 tcx: TyCtxt<'a, 'gcx, 'tcx>,
256 original: &ty::Binder<T>,
257 lifted: Option<ty::Binder<U>>) -> fmt::Result
258 where T: fmt::Display, U: fmt::Display + TypeFoldable<'tcx>
260 // Replace any anonymous late-bound regions with named
261 // variants, using gensym'd identifiers, so that we can
262 // clearly differentiate between named and unnamed regions in
263 // the output. We'll probably want to tweak this over time to
264 // decide just how much information to give.
265 let value = if let Some(v) = lifted {
268 return write!(f, "{}", original.0);
271 let mut empty = true;
272 let mut start_or_continue = |f: &mut fmt::Formatter, start: &str, cont: &str| {
275 write!(f, "{}", start)
277 write!(f, "{}", cont)
281 let new_value = tcx.replace_late_bound_regions(&value, |br| {
282 let _ = start_or_continue(f, "for<", ", ");
284 ty::BrNamed(_, name) => {
285 let _ = write!(f, "{}", name);
291 let name = Symbol::intern("'r");
292 let _ = write!(f, "{}", name);
293 ty::BrNamed(tcx.hir.local_def_id(CRATE_NODE_ID),
297 tcx.mk_region(ty::ReLateBound(ty::DebruijnIndex::new(1), br))
300 start_or_continue(f, "", "> ")?;
301 write!(f, "{}", new_value)
304 impl<'tcx> fmt::Display for &'tcx ty::Slice<ty::ExistentialPredicate<'tcx>> {
305 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
306 // Generate the main trait ref, including associated types.
307 ty::tls::with(|tcx| {
308 // Use a type that can't appear in defaults of type parameters.
309 let dummy_self = tcx.mk_infer(ty::FreshTy(0));
311 if let Some(p) = self.principal() {
312 let principal = tcx.lift(&p).expect("could not lift TraitRef for printing")
313 .with_self_ty(tcx, dummy_self);
314 let projections = self.projection_bounds().map(|p| {
316 .expect("could not lift projection for printing")
317 .with_self_ty(tcx, dummy_self)
318 }).collect::<Vec<_>>();
319 parameterized(f, principal.substs, principal.def_id, &projections)?;
323 for did in self.auto_traits() {
324 write!(f, " + {}", tcx.item_path_str(did))?;
334 impl fmt::Debug for ty::TypeParameterDef {
335 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
336 write!(f, "TypeParameterDef({}, {:?}, {})",
343 impl fmt::Debug for ty::RegionParameterDef {
344 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
345 write!(f, "RegionParameterDef({}, {:?}, {})",
352 impl<'tcx> fmt::Debug for ty::TyS<'tcx> {
353 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
354 write!(f, "{}", *self)
358 impl<'tcx> fmt::Display for ty::TypeAndMut<'tcx> {
359 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
361 if self.mutbl == hir::MutMutable { "mut " } else { "" },
366 impl<'tcx> fmt::Debug for ty::ItemSubsts<'tcx> {
367 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
368 write!(f, "ItemSubsts({:?})", self.substs)
372 impl<'tcx> fmt::Debug for ty::TraitRef<'tcx> {
373 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
374 // when printing out the debug representation, we don't need
375 // to enumerate the `for<...>` etc because the debruijn index
376 // tells you everything you need to know.
377 write!(f, "<{:?} as {}>", self.self_ty(), *self)
381 impl<'tcx> fmt::Debug for ty::ExistentialTraitRef<'tcx> {
382 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
383 ty::tls::with(|tcx| {
384 let dummy_self = tcx.mk_infer(ty::FreshTy(0));
386 let trait_ref = tcx.lift(&ty::Binder(*self))
387 .expect("could not lift TraitRef for printing")
388 .with_self_ty(tcx, dummy_self).0;
389 parameterized(f, trait_ref.substs, trait_ref.def_id, &[])
394 impl fmt::Debug for ty::TraitDef {
395 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
396 ty::tls::with(|tcx| {
397 write!(f, "{}", tcx.item_path_str(self.def_id))
402 impl fmt::Debug for ty::AdtDef {
403 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
404 ty::tls::with(|tcx| {
405 write!(f, "{}", tcx.item_path_str(self.did))
410 impl<'tcx> fmt::Debug for ty::adjustment::Adjustment<'tcx> {
411 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
412 write!(f, "{:?} -> {}", self.kind, self.target)
416 impl<'tcx> fmt::Debug for ty::Predicate<'tcx> {
417 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
419 ty::Predicate::Trait(ref a) => write!(f, "{:?}", a),
420 ty::Predicate::Equate(ref pair) => write!(f, "{:?}", pair),
421 ty::Predicate::Subtype(ref pair) => write!(f, "{:?}", pair),
422 ty::Predicate::RegionOutlives(ref pair) => write!(f, "{:?}", pair),
423 ty::Predicate::TypeOutlives(ref pair) => write!(f, "{:?}", pair),
424 ty::Predicate::Projection(ref pair) => write!(f, "{:?}", pair),
425 ty::Predicate::WellFormed(ty) => write!(f, "WF({:?})", ty),
426 ty::Predicate::ObjectSafe(trait_def_id) => {
427 write!(f, "ObjectSafe({:?})", trait_def_id)
429 ty::Predicate::ClosureKind(closure_def_id, kind) => {
430 write!(f, "ClosureKind({:?}, {:?})", closure_def_id, kind)
436 impl fmt::Display for ty::BoundRegion {
437 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
439 return write!(f, "{:?}", *self);
443 BrNamed(_, name) => write!(f, "{}", name),
444 BrAnon(_) | BrFresh(_) | BrEnv => Ok(())
449 impl fmt::Debug for ty::BoundRegion {
450 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
452 BrAnon(n) => write!(f, "BrAnon({:?})", n),
453 BrFresh(n) => write!(f, "BrFresh({:?})", n),
454 BrNamed(did, name) => {
455 write!(f, "BrNamed({:?}:{:?}, {:?})",
456 did.krate, did.index, name)
458 BrEnv => "BrEnv".fmt(f),
463 impl fmt::Debug for ty::RegionKind {
464 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
466 ty::ReEarlyBound(ref data) => {
467 write!(f, "ReEarlyBound({}, {})",
472 ty::ReLateBound(binder_id, ref bound_region) => {
473 write!(f, "ReLateBound({:?}, {:?})",
478 ty::ReFree(ref fr) => write!(f, "{:?}", fr),
481 write!(f, "ReScope({:?})", id)
484 ty::ReStatic => write!(f, "ReStatic"),
486 ty::ReVar(ref vid) => {
487 write!(f, "{:?}", vid)
490 ty::ReSkolemized(id, ref bound_region) => {
491 write!(f, "ReSkolemized({}, {:?})", id.index, bound_region)
494 ty::ReEmpty => write!(f, "ReEmpty"),
496 ty::ReErased => write!(f, "ReErased")
501 impl<'tcx> fmt::Debug for ty::ClosureUpvar<'tcx> {
502 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
503 write!(f, "ClosureUpvar({:?},{:?})",
509 impl fmt::Display for ty::RegionKind {
510 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
512 return write!(f, "{:?}", *self);
515 // These printouts are concise. They do not contain all the information
516 // the user might want to diagnose an error, but there is basically no way
517 // to fit that into a short string. Hence the recommendation to use
518 // `explain_region()` or `note_and_explain_region()`.
520 ty::ReEarlyBound(ref data) => {
521 write!(f, "{}", data.name)
523 ty::ReLateBound(_, br) |
524 ty::ReFree(ty::FreeRegion { bound_region: br, .. }) |
525 ty::ReSkolemized(_, br) => {
530 ty::ReErased => Ok(()),
531 ty::ReStatic => write!(f, "'static"),
532 ty::ReEmpty => write!(f, "'<empty>"),
537 impl fmt::Debug for ty::FreeRegion {
538 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
539 write!(f, "ReFree({:?}, {:?})",
540 self.scope, self.bound_region)
544 impl fmt::Debug for ty::Variance {
545 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
546 f.write_str(match *self {
547 ty::Covariant => "+",
548 ty::Contravariant => "-",
549 ty::Invariant => "o",
550 ty::Bivariant => "*",
555 impl<'tcx> fmt::Debug for ty::GenericPredicates<'tcx> {
556 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
557 write!(f, "GenericPredicates({:?})", self.predicates)
561 impl<'tcx> fmt::Debug for ty::InstantiatedPredicates<'tcx> {
562 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
563 write!(f, "InstantiatedPredicates({:?})",
568 impl<'tcx> fmt::Display for ty::FnSig<'tcx> {
569 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
570 if self.unsafety == hir::Unsafety::Unsafe {
571 write!(f, "unsafe ")?;
574 if self.abi != Abi::Rust {
575 write!(f, "extern {} ", self.abi)?;
579 fn_sig(f, self.inputs(), self.variadic, self.output())
583 impl fmt::Debug for ty::TyVid {
584 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
585 write!(f, "_#{}t", self.index)
589 impl fmt::Debug for ty::IntVid {
590 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
591 write!(f, "_#{}i", self.index)
595 impl fmt::Debug for ty::FloatVid {
596 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
597 write!(f, "_#{}f", self.index)
601 impl fmt::Debug for ty::RegionVid {
602 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
603 write!(f, "'_#{}r", self.index)
607 impl<'tcx> fmt::Debug for ty::FnSig<'tcx> {
608 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
609 write!(f, "({:?}; variadic: {})->{:?}", self.inputs(), self.variadic, self.output())
613 impl fmt::Debug for ty::InferTy {
614 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
616 ty::TyVar(ref v) => v.fmt(f),
617 ty::IntVar(ref v) => v.fmt(f),
618 ty::FloatVar(ref v) => v.fmt(f),
619 ty::FreshTy(v) => write!(f, "FreshTy({:?})", v),
620 ty::FreshIntTy(v) => write!(f, "FreshIntTy({:?})", v),
621 ty::FreshFloatTy(v) => write!(f, "FreshFloatTy({:?})", v)
626 impl fmt::Debug for ty::IntVarValue {
627 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
629 ty::IntType(ref v) => v.fmt(f),
630 ty::UintType(ref v) => v.fmt(f),
635 // The generic impl doesn't work yet because projections are not
636 // normalized under HRTB.
637 /*impl<T> fmt::Display for ty::Binder<T>
638 where T: fmt::Display + for<'a> ty::Lift<'a>,
639 for<'a> <T as ty::Lift<'a>>::Lifted: fmt::Display + TypeFoldable<'a>
641 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
642 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
646 impl<'tcx> fmt::Display for ty::Binder<&'tcx ty::Slice<ty::ExistentialPredicate<'tcx>>> {
647 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
648 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
652 impl<'tcx> fmt::Display for ty::Binder<ty::TraitRef<'tcx>> {
653 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
654 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
658 impl<'tcx> fmt::Display for ty::Binder<ty::TraitPredicate<'tcx>> {
659 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
660 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
664 impl<'tcx> fmt::Display for ty::Binder<ty::EquatePredicate<'tcx>> {
665 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
666 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
670 impl<'tcx> fmt::Display for ty::Binder<ty::SubtypePredicate<'tcx>> {
671 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
672 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
676 impl<'tcx> fmt::Display for ty::Binder<ty::ProjectionPredicate<'tcx>> {
677 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
678 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
682 impl<'tcx> fmt::Display for ty::Binder<ty::OutlivesPredicate<Ty<'tcx>, ty::Region<'tcx>>> {
683 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
684 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
688 impl<'tcx> fmt::Display for ty::Binder<ty::OutlivesPredicate<ty::Region<'tcx>,
690 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
691 ty::tls::with(|tcx| in_binder(f, tcx, self, tcx.lift(self)))
695 impl<'tcx> fmt::Display for ty::TraitRef<'tcx> {
696 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
697 parameterized(f, self.substs, self.def_id, &[])
701 impl<'tcx> fmt::Display for ty::TypeVariants<'tcx> {
702 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
704 TyBool => write!(f, "bool"),
705 TyChar => write!(f, "char"),
706 TyInt(t) => write!(f, "{}", t.ty_to_string()),
707 TyUint(t) => write!(f, "{}", t.ty_to_string()),
708 TyFloat(t) => write!(f, "{}", t.ty_to_string()),
709 TyRawPtr(ref tm) => {
710 write!(f, "*{} {}", match tm.mutbl {
711 hir::MutMutable => "mut",
712 hir::MutImmutable => "const",
715 TyRef(r, ref tm) => {
717 let s = r.to_string();
724 TyNever => write!(f, "!"),
725 TyTuple(ref tys, _) => {
727 let mut tys = tys.iter();
728 if let Some(&ty) = tys.next() {
729 write!(f, "{},", ty)?;
730 if let Some(&ty) = tys.next() {
731 write!(f, " {}", ty)?;
733 write!(f, ", {}", ty)?;
739 TyFnDef(def_id, substs, ref bare_fn) => {
740 write!(f, "{} {{", bare_fn.0)?;
741 parameterized(f, substs, def_id, &[])?;
744 TyFnPtr(ref bare_fn) => {
745 write!(f, "{}", bare_fn.0)
747 TyInfer(infer_ty) => write!(f, "{}", infer_ty),
748 TyError => write!(f, "[type error]"),
749 TyParam(ref param_ty) => write!(f, "{}", param_ty),
750 TyAdt(def, substs) => parameterized(f, substs, def.did, &[]),
751 TyDynamic(data, r) => {
752 write!(f, "{}", data)?;
753 let r = r.to_string();
755 write!(f, " + {}", r)
760 TyProjection(ref data) => write!(f, "{}", data),
761 TyAnon(def_id, substs) => {
762 ty::tls::with(|tcx| {
763 // Grab the "TraitA + TraitB" from `impl TraitA + TraitB`,
764 // by looking up the projections associated with the def_id.
765 let predicates_of = tcx.predicates_of(def_id);
766 let substs = tcx.lift(&substs).unwrap_or_else(|| {
767 tcx.intern_substs(&[])
769 let bounds = predicates_of.instantiate(tcx, substs);
771 let mut first = true;
772 let mut is_sized = false;
774 for predicate in bounds.predicates {
775 if let Some(trait_ref) = predicate.to_opt_poly_trait_ref() {
776 // Don't print +Sized, but rather +?Sized if absent.
777 if Some(trait_ref.def_id()) == tcx.lang_items.sized_trait() {
782 write!(f, "{}{}", if first { " " } else { "+" }, trait_ref)?;
787 write!(f, "{}?Sized", if first { " " } else { "+" })?;
792 TyStr => write!(f, "str"),
793 TyClosure(did, substs) => ty::tls::with(|tcx| {
794 let upvar_tys = substs.upvar_tys(did, tcx);
795 write!(f, "[closure")?;
797 if let Some(node_id) = tcx.hir.as_local_node_id(did) {
798 write!(f, "@{:?}", tcx.hir.span(node_id))?;
800 tcx.with_freevars(node_id, |freevars| {
801 for (freevar, upvar_ty) in freevars.iter().zip(upvar_tys) {
802 let def_id = freevar.def.def_id();
803 let node_id = tcx.hir.as_local_node_id(def_id).unwrap();
807 tcx.local_var_name_str(node_id),
814 // cross-crate closure types should only be
815 // visible in trans bug reports, I imagine.
816 write!(f, "@{:?}", did)?;
818 for (index, upvar_ty) in upvar_tys.enumerate() {
819 write!(f, "{}{}:{}", sep, index, upvar_ty)?;
826 TyArray(ty, sz) => write!(f, "[{}; {}]", ty, sz),
827 TySlice(ty) => write!(f, "[{}]", ty)
832 impl<'tcx> fmt::Display for ty::TyS<'tcx> {
833 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
834 write!(f, "{}", self.sty)
838 impl fmt::Debug for ty::UpvarId {
839 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
840 write!(f, "UpvarId({};`{}`;{})",
842 ty::tls::with(|tcx| tcx.local_var_name_str(self.var_id)),
843 self.closure_expr_id)
847 impl<'tcx> fmt::Debug for ty::UpvarBorrow<'tcx> {
848 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
849 write!(f, "UpvarBorrow({:?}, {:?})",
850 self.kind, self.region)
854 impl fmt::Display for ty::InferTy {
855 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
856 let print_var_ids = verbose();
858 ty::TyVar(ref vid) if print_var_ids => write!(f, "{:?}", vid),
859 ty::IntVar(ref vid) if print_var_ids => write!(f, "{:?}", vid),
860 ty::FloatVar(ref vid) if print_var_ids => write!(f, "{:?}", vid),
861 ty::TyVar(_) => write!(f, "_"),
862 ty::IntVar(_) => write!(f, "{}", "{integer}"),
863 ty::FloatVar(_) => write!(f, "{}", "{float}"),
864 ty::FreshTy(v) => write!(f, "FreshTy({})", v),
865 ty::FreshIntTy(v) => write!(f, "FreshIntTy({})", v),
866 ty::FreshFloatTy(v) => write!(f, "FreshFloatTy({})", v)
871 impl fmt::Display for ty::ParamTy {
872 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
873 write!(f, "{}", self.name)
877 impl fmt::Debug for ty::ParamTy {
878 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
879 write!(f, "{}/#{}", self, self.idx)
883 impl<'tcx, T, U> fmt::Display for ty::OutlivesPredicate<T,U>
884 where T: fmt::Display, U: fmt::Display
886 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
887 write!(f, "{} : {}", self.0, self.1)
891 impl<'tcx> fmt::Display for ty::EquatePredicate<'tcx> {
892 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
893 write!(f, "{} == {}", self.0, self.1)
897 impl<'tcx> fmt::Display for ty::SubtypePredicate<'tcx> {
898 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
899 write!(f, "{} <: {}", self.a, self.b)
903 impl<'tcx> fmt::Debug for ty::TraitPredicate<'tcx> {
904 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
905 write!(f, "TraitPredicate({:?})",
910 impl<'tcx> fmt::Display for ty::TraitPredicate<'tcx> {
911 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
912 write!(f, "{}: {}", self.trait_ref.self_ty(), self.trait_ref)
916 impl<'tcx> fmt::Debug for ty::ProjectionPredicate<'tcx> {
917 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
918 write!(f, "ProjectionPredicate({:?}, {:?})",
924 impl<'tcx> fmt::Display for ty::ProjectionPredicate<'tcx> {
925 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
926 write!(f, "{} == {}",
932 impl<'tcx> fmt::Display for ty::ProjectionTy<'tcx> {
933 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
934 let item_name = ty::tls::with(|tcx| self.item_name(tcx));
935 write!(f, "{:?}::{}",
941 impl fmt::Display for ty::ClosureKind {
942 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
944 ty::ClosureKind::Fn => write!(f, "Fn"),
945 ty::ClosureKind::FnMut => write!(f, "FnMut"),
946 ty::ClosureKind::FnOnce => write!(f, "FnOnce"),
951 impl<'tcx> fmt::Display for ty::Predicate<'tcx> {
952 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
954 ty::Predicate::Trait(ref data) => write!(f, "{}", data),
955 ty::Predicate::Equate(ref predicate) => write!(f, "{}", predicate),
956 ty::Predicate::Subtype(ref predicate) => write!(f, "{}", predicate),
957 ty::Predicate::RegionOutlives(ref predicate) => write!(f, "{}", predicate),
958 ty::Predicate::TypeOutlives(ref predicate) => write!(f, "{}", predicate),
959 ty::Predicate::Projection(ref predicate) => write!(f, "{}", predicate),
960 ty::Predicate::WellFormed(ty) => write!(f, "{} well-formed", ty),
961 ty::Predicate::ObjectSafe(trait_def_id) =>
962 ty::tls::with(|tcx| {
963 write!(f, "the trait `{}` is object-safe", tcx.item_path_str(trait_def_id))
965 ty::Predicate::ClosureKind(closure_def_id, kind) =>
966 ty::tls::with(|tcx| {
967 write!(f, "the closure `{}` implements the trait `{}`",
968 tcx.item_path_str(closure_def_id), kind)