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.
13 use middle::subst::{VecPerParamSpace,Subst};
15 use middle::ty::{BoundRegion, BrAnon, BrNamed};
16 use middle::ty::{ReEarlyBound, BrFresh, ctxt};
17 use middle::ty::{ReFree, ReScope, ReInfer, ReStatic, Region, ReEmpty};
18 use middle::ty::{ReSkolemized, ReVar};
19 use middle::ty::{mt, t, ParamTy};
20 use middle::ty::{ty_bool, ty_char, ty_bot, ty_box, ty_struct, ty_enum};
21 use middle::ty::{ty_err, ty_str, ty_vec, ty_float, ty_bare_fn, ty_closure};
22 use middle::ty::{ty_nil, ty_param, ty_ptr, ty_rptr, ty_tup, ty_open};
23 use middle::ty::{ty_unboxed_closure};
24 use middle::ty::{ty_uniq, ty_trait, ty_int, ty_uint, ty_infer};
27 use middle::typeck::check::regionmanip;
32 use syntax::codemap::{Span, Pos};
33 use syntax::parse::token;
34 use syntax::print::pprust;
35 use syntax::{ast, ast_util};
36 use syntax::owned_slice::OwnedSlice;
38 /// Produces a string suitable for debugging output.
40 fn repr(&self, tcx: &ctxt) -> String;
43 /// Produces a string suitable for showing to the user.
44 pub trait UserString {
45 fn user_string(&self, tcx: &ctxt) -> String;
48 pub fn note_and_explain_region(cx: &ctxt,
52 match explain_region_and_span(cx, region) {
53 (ref str, Some(span)) => {
56 format!("{}{}{}", prefix, *str, suffix).as_slice());
60 format!("{}{}{}", prefix, *str, suffix).as_slice());
65 fn item_scope_tag(item: &ast::Item) -> &'static str {
67 * When a free region is associated with `item`, how should we describe
68 * the item in the error message.
72 ast::ItemImpl(..) => "impl",
73 ast::ItemStruct(..) => "struct",
74 ast::ItemEnum(..) => "enum",
75 ast::ItemTrait(..) => "trait",
76 ast::ItemFn(..) => "function body",
81 pub fn explain_region_and_span(cx: &ctxt, region: ty::Region)
82 -> (String, Option<Span>) {
85 match cx.map.find(node_id) {
86 Some(ast_map::NodeBlock(ref blk)) => {
87 explain_span(cx, "block", blk.span)
89 Some(ast_map::NodeExpr(expr)) => {
91 ast::ExprCall(..) => explain_span(cx, "call", expr.span),
92 ast::ExprMethodCall(..) => {
93 explain_span(cx, "method call", expr.span)
95 ast::ExprMatch(_, _, ast::MatchIfLetDesugar) => explain_span(cx, "if let", expr.span),
96 ast::ExprMatch(..) => explain_span(cx, "match", expr.span),
97 _ => explain_span(cx, "expression", expr.span)
100 Some(ast_map::NodeStmt(stmt)) => {
101 explain_span(cx, "statement", stmt.span)
103 Some(ast_map::NodeItem(it)) => {
104 let tag = item_scope_tag(&*it);
105 explain_span(cx, tag, it.span)
108 // this really should not happen
109 (format!("unknown scope: {}. Please report a bug.", node_id), None)
115 let prefix = match fr.bound_region {
117 format!("the anonymous lifetime #{} defined on", idx + 1)
119 BrFresh(_) => "an anonymous lifetime defined on".to_string(),
121 format!("the lifetime {} as defined on",
122 bound_region_ptr_to_string(cx, fr.bound_region))
126 match cx.map.find(fr.scope_id) {
127 Some(ast_map::NodeBlock(ref blk)) => {
128 let (msg, opt_span) = explain_span(cx, "block", blk.span);
129 (format!("{} {}", prefix, msg), opt_span)
131 Some(ast_map::NodeItem(it)) => {
132 let tag = item_scope_tag(&*it);
133 let (msg, opt_span) = explain_span(cx, tag, it.span);
134 (format!("{} {}", prefix, msg), opt_span)
137 // this really should not happen
138 (format!("{} node {}", prefix, fr.scope_id), None)
143 ReStatic => { ("the static lifetime".to_string(), None) }
145 ReEmpty => { ("the empty lifetime".to_string(), None) }
147 ReEarlyBound(_, _, _, name) => {
148 (format!("{}", token::get_name(name)), None)
151 // I believe these cases should not occur (except when debugging,
153 ty::ReInfer(_) | ty::ReLateBound(..) => {
154 (format!("lifetime {:?}", region), None)
158 fn explain_span(cx: &ctxt, heading: &str, span: Span)
159 -> (String, Option<Span>) {
160 let lo = cx.sess.codemap().lookup_char_pos_adj(span.lo);
161 (format!("the {} at {}:{}", heading, lo.line, lo.col.to_uint()),
166 pub fn bound_region_ptr_to_string(cx: &ctxt, br: BoundRegion) -> String {
167 bound_region_to_string(cx, "", false, br)
170 pub fn bound_region_to_string(cx: &ctxt,
171 prefix: &str, space: bool,
172 br: BoundRegion) -> String {
173 let space_str = if space { " " } else { "" };
175 if cx.sess.verbose() {
176 return format!("{}{}{}", prefix, br.repr(cx), space_str)
180 BrNamed(_, name) => {
181 format!("{}{}{}", prefix, token::get_name(name), space_str)
183 BrAnon(_) => prefix.to_string(),
184 BrFresh(_) => prefix.to_string(),
188 // In general, if you are giving a region error message,
189 // you should use `explain_region()` or, better yet,
190 // `note_and_explain_region()`
191 pub fn region_ptr_to_string(cx: &ctxt, region: Region) -> String {
192 region_to_string(cx, "&", true, region)
195 pub fn region_to_string(cx: &ctxt, prefix: &str, space: bool, region: Region) -> String {
196 let space_str = if space { " " } else { "" };
198 if cx.sess.verbose() {
199 return format!("{}{}{}", prefix, region.repr(cx), space_str)
202 // These printouts are concise. They do not contain all the information
203 // the user might want to diagnose an error, but there is basically no way
204 // to fit that into a short string. Hence the recommendation to use
205 // `explain_region()` or `note_and_explain_region()`.
207 ty::ReScope(_) => prefix.to_string(),
208 ty::ReEarlyBound(_, _, _, name) => {
209 token::get_name(name).get().to_string()
211 ty::ReLateBound(_, br) => bound_region_to_string(cx, prefix, space, br),
212 ty::ReFree(ref fr) => bound_region_to_string(cx, prefix, space, fr.bound_region),
213 ty::ReInfer(ReSkolemized(_, br)) => {
214 bound_region_to_string(cx, prefix, space, br)
216 ty::ReInfer(ReVar(_)) => prefix.to_string(),
217 ty::ReStatic => format!("{}'static{}", prefix, space_str),
218 ty::ReEmpty => format!("{}'<empty>{}", prefix, space_str),
222 pub fn mutability_to_string(m: ast::Mutability) -> String {
224 ast::MutMutable => "mut ".to_string(),
225 ast::MutImmutable => "".to_string(),
229 pub fn mt_to_string(cx: &ctxt, m: &mt) -> String {
230 format!("{}{}", mutability_to_string(m.mutbl), ty_to_string(cx, m.ty))
233 pub fn trait_store_to_string(cx: &ctxt, s: ty::TraitStore) -> String {
235 ty::UniqTraitStore => "Box ".to_string(),
236 ty::RegionTraitStore(r, m) => {
237 format!("{}{}", region_ptr_to_string(cx, r), mutability_to_string(m))
242 pub fn vec_map_to_string<T>(ts: &[T], f: |t: &T| -> String) -> String {
243 let tstrs = ts.iter().map(f).collect::<Vec<String>>();
244 format!("[{}]", tstrs.connect(", "))
247 pub fn fn_sig_to_string(cx: &ctxt, typ: &ty::FnSig) -> String {
248 format!("fn{}{} -> {}", typ.binder_id, typ.inputs.repr(cx),
252 pub fn trait_ref_to_string(cx: &ctxt, trait_ref: &ty::TraitRef) -> String {
253 trait_ref.user_string(cx).to_string()
256 pub fn ty_to_string(cx: &ctxt, typ: t) -> String {
257 fn fn_input_to_string(cx: &ctxt, input: ty::t) -> String {
258 ty_to_string(cx, input).to_string()
260 fn bare_fn_to_string(cx: &ctxt,
261 fn_style: ast::FnStyle,
263 ident: Option<ast::Ident>,
266 let mut s = String::new();
270 s.push_str(fn_style.to_string().as_slice());
275 if abi != abi::Rust {
276 s.push_str(format!("extern {} ", abi.to_string()).as_slice());
284 s.push_str(token::get_ident(i).get());
289 push_sig_to_string(cx, &mut s, '(', ')', sig, "");
294 fn closure_to_string(cx: &ctxt, cty: &ty::ClosureTy) -> String {
295 let mut s = String::new();
298 ty::UniqTraitStore => {}
299 ty::RegionTraitStore(region, _) => {
300 s.push_str(region_to_string(cx, "", true, region).as_slice());
307 s.push_str(cty.fn_style.to_string().as_slice());
312 let bounds_str = cty.bounds.user_string(cx);
315 ty::UniqTraitStore => {
316 assert_eq!(cty.onceness, ast::Once);
318 push_sig_to_string(cx, &mut s, '(', ')', &cty.sig,
319 bounds_str.as_slice());
321 ty::RegionTraitStore(..) => {
324 ast::Once => s.push_str("once ")
326 push_sig_to_string(cx, &mut s, '|', '|', &cty.sig,
327 bounds_str.as_slice());
334 fn push_sig_to_string(cx: &ctxt,
341 let strs: Vec<String> = sig.inputs.iter().map(|a| fn_input_to_string(cx, *a)).collect();
342 s.push_str(strs.connect(", ").as_slice());
348 if !bounds.is_empty() {
353 if ty::get(sig.output).sty != ty_nil {
355 if ty::type_is_bot(sig.output) {
358 s.push_str(ty_to_string(cx, sig.output).as_slice());
363 // if there is an id, print that instead of the structural type:
364 /*for def_id in ty::type_def_id(typ).iter() {
365 // note that this typedef cannot have type parameters
366 return ty::item_path_str(cx, *def_id);
369 // pretty print the structural type representation:
370 return match ty::get(typ).sty {
371 ty_nil => "()".to_string(),
372 ty_bot => "!".to_string(),
373 ty_bool => "bool".to_string(),
374 ty_char => "char".to_string(),
375 ty_int(t) => ast_util::int_ty_to_string(t, None).to_string(),
376 ty_uint(t) => ast_util::uint_ty_to_string(t, None).to_string(),
377 ty_float(t) => ast_util::float_ty_to_string(t).to_string(),
378 ty_box(typ) => format!("Gc<{}>", ty_to_string(cx, typ)),
379 ty_uniq(typ) => format!("Box<{}>", ty_to_string(cx, typ)),
381 format!("*{} {}", match tm.mutbl {
382 ast::MutMutable => "mut",
383 ast::MutImmutable => "const",
384 }, ty_to_string(cx, tm.ty))
386 ty_rptr(r, ref tm) => {
387 let mut buf = region_ptr_to_string(cx, r);
388 buf.push_str(mt_to_string(cx, tm).as_slice());
391 ty_open(typ) => format!("opened<{}>", ty_to_string(cx, typ)),
392 ty_tup(ref elems) => {
393 let strs: Vec<String> = elems.iter().map(|elem| ty_to_string(cx, *elem)).collect();
394 format!("({})", strs.connect(","))
396 ty_closure(ref f) => {
397 closure_to_string(cx, &**f)
399 ty_bare_fn(ref f) => {
400 bare_fn_to_string(cx, f.fn_style, f.abi, None, &f.sig)
402 ty_infer(infer_ty) => infer_ty.to_string(),
403 ty_err => "[type error]".to_string(),
404 ty_param(ref param_ty) => {
407 ty_enum(did, ref substs) | ty_struct(did, ref substs) => {
408 let base = ty::item_path_str(cx, did);
409 let generics = ty::lookup_item_type(cx, did).generics;
410 parameterized(cx, base.as_slice(), substs, &generics)
412 ty_trait(box ty::TyTrait {
413 def_id: did, ref substs, ref bounds
415 let base = ty::item_path_str(cx, did);
416 let trait_def = ty::lookup_trait_def(cx, did);
417 let ty = parameterized(cx, base.as_slice(),
418 substs, &trait_def.generics);
419 let bound_str = bounds.user_string(cx);
420 let bound_sep = if bound_str.is_empty() { "" } else { "+" };
426 ty_str => "str".to_string(),
427 ty_unboxed_closure(..) => "closure".to_string(),
431 format!("[{}, .. {}]", ty_to_string(cx, t), n)
433 None => format!("[{}]", ty_to_string(cx, t)),
439 pub fn explicit_self_category_to_str(category: &ty::ExplicitSelfCategory)
442 ty::StaticExplicitSelfCategory => "static",
443 ty::ByValueExplicitSelfCategory => "self",
444 ty::ByReferenceExplicitSelfCategory(_, ast::MutMutable) => {
447 ty::ByReferenceExplicitSelfCategory(_, ast::MutImmutable) => "&self",
448 ty::ByBoxExplicitSelfCategory => "Box<self>",
452 pub fn parameterized(cx: &ctxt,
454 substs: &subst::Substs,
455 generics: &ty::Generics)
458 let mut strs = Vec::new();
460 match substs.regions {
461 subst::ErasedRegions => { }
462 subst::NonerasedRegions(ref regions) => {
463 for &r in regions.iter() {
464 let s = region_to_string(cx, "", false, r);
468 // This happens when the value of the region
469 // parameter is not easily serialized. This may be
470 // because the user omitted it in the first place,
471 // or because it refers to some block in the code,
472 // etc. I'm not sure how best to serialize this.
473 strs.push(format!("'_"));
479 let tps = substs.types.get_slice(subst::TypeSpace);
480 let ty_params = generics.types.get_slice(subst::TypeSpace);
481 let has_defaults = ty_params.last().map_or(false, |def| def.default.is_some());
482 let num_defaults = if has_defaults && !cx.sess.verbose() {
483 ty_params.iter().zip(tps.iter()).rev().take_while(|&(def, &actual)| {
485 Some(default) => default.subst(cx, substs) == actual,
493 for t in tps.slice_to(tps.len() - num_defaults).iter() {
494 strs.push(ty_to_string(cx, *t))
497 if cx.sess.verbose() {
498 for t in substs.types.get_slice(subst::SelfSpace).iter() {
499 strs.push(format!("self {}", t.repr(cx)));
502 // generally there shouldn't be any substs in the fn param
503 // space, but in verbose mode, print them out.
504 for t in substs.types.get_slice(subst::FnSpace).iter() {
505 strs.push(format!("fn {}", t.repr(cx)));
510 format!("{}<{}>", base, strs.connect(","))
516 pub fn ty_to_short_str(cx: &ctxt, typ: t) -> String {
517 let mut s = typ.repr(cx).to_string();
519 s = s.as_slice().slice(0u, 32u).to_string();
524 impl<T:Repr> Repr for Option<T> {
525 fn repr(&self, tcx: &ctxt) -> String {
527 &None => "None".to_string(),
528 &Some(ref t) => t.repr(tcx),
533 impl<T:Repr,U:Repr> Repr for Result<T,U> {
534 fn repr(&self, tcx: &ctxt) -> String {
536 &Ok(ref t) => t.repr(tcx),
537 &Err(ref u) => format!("Err({})", u.repr(tcx))
543 fn repr(&self, _tcx: &ctxt) -> String {
548 impl<'a,T:Repr> Repr for &'a T {
549 fn repr(&self, tcx: &ctxt) -> String {
554 impl<T:Repr> Repr for Rc<T> {
555 fn repr(&self, tcx: &ctxt) -> String {
560 impl<T:Repr> Repr for Box<T> {
561 fn repr(&self, tcx: &ctxt) -> String {
566 fn repr_vec<T:Repr>(tcx: &ctxt, v: &[T]) -> String {
567 vec_map_to_string(v, |t| t.repr(tcx))
570 impl<'a, T:Repr> Repr for &'a [T] {
571 fn repr(&self, tcx: &ctxt) -> String {
576 impl<T:Repr> Repr for OwnedSlice<T> {
577 fn repr(&self, tcx: &ctxt) -> String {
578 repr_vec(tcx, self.as_slice())
582 // This is necessary to handle types like Option<~[T]>, for which
583 // autoderef cannot convert the &[T] handler
584 impl<T:Repr> Repr for Vec<T> {
585 fn repr(&self, tcx: &ctxt) -> String {
586 repr_vec(tcx, self.as_slice())
590 impl<T:UserString> UserString for Vec<T> {
591 fn user_string(&self, tcx: &ctxt) -> String {
592 let strs: Vec<String> =
593 self.iter().map(|t| t.user_string(tcx)).collect();
598 impl Repr for def::Def {
599 fn repr(&self, _tcx: &ctxt) -> String {
600 format!("{:?}", *self)
604 impl Repr for ty::TypeParameterDef {
605 fn repr(&self, tcx: &ctxt) -> String {
606 format!("TypeParameterDef({}, {}, {}/{})",
608 self.bounds.repr(tcx),
614 impl Repr for ty::RegionParameterDef {
615 fn repr(&self, tcx: &ctxt) -> String {
616 format!("RegionParameterDef(name={}, def_id={}, bounds={})",
617 token::get_name(self.name),
618 self.def_id.repr(tcx),
619 self.bounds.repr(tcx))
623 impl Repr for ty::t {
624 fn repr(&self, tcx: &ctxt) -> String {
625 ty_to_string(tcx, *self)
629 impl Repr for ty::mt {
630 fn repr(&self, tcx: &ctxt) -> String {
631 mt_to_string(tcx, self)
635 impl Repr for subst::Substs {
636 fn repr(&self, tcx: &ctxt) -> String {
637 format!("Substs[types={}, regions={}]",
638 self.types.repr(tcx),
639 self.regions.repr(tcx))
643 impl<T:Repr> Repr for subst::VecPerParamSpace<T> {
644 fn repr(&self, tcx: &ctxt) -> String {
645 format!("[{};{};{}]",
646 self.get_slice(subst::TypeSpace).repr(tcx),
647 self.get_slice(subst::SelfSpace).repr(tcx),
648 self.get_slice(subst::FnSpace).repr(tcx))
652 impl Repr for ty::ItemSubsts {
653 fn repr(&self, tcx: &ctxt) -> String {
654 format!("ItemSubsts({})", self.substs.repr(tcx))
658 impl Repr for subst::RegionSubsts {
659 fn repr(&self, tcx: &ctxt) -> String {
661 subst::ErasedRegions => "erased".to_string(),
662 subst::NonerasedRegions(ref regions) => regions.repr(tcx)
667 impl Repr for ty::BuiltinBounds {
668 fn repr(&self, _tcx: &ctxt) -> String {
669 let mut res = Vec::new();
670 for b in self.iter() {
672 ty::BoundSend => "Send".to_owned(),
673 ty::BoundSized => "Sized".to_owned(),
674 ty::BoundCopy => "Copy".to_owned(),
675 ty::BoundSync => "Sync".to_owned(),
682 impl Repr for ty::ExistentialBounds {
683 fn repr(&self, tcx: &ctxt) -> String {
684 self.user_string(tcx)
688 impl Repr for ty::ParamBounds {
689 fn repr(&self, tcx: &ctxt) -> String {
690 let mut res = Vec::new();
691 res.push(self.builtin_bounds.repr(tcx));
692 for t in self.trait_bounds.iter() {
693 res.push(t.repr(tcx));
699 impl Repr for ty::TraitRef {
700 fn repr(&self, tcx: &ctxt) -> String {
701 let base = ty::item_path_str(tcx, self.def_id);
702 let trait_def = ty::lookup_trait_def(tcx, self.def_id);
703 format!("<{} as {}>",
704 self.substs.self_ty().repr(tcx),
705 parameterized(tcx, base.as_slice(), &self.substs, &trait_def.generics))
709 impl Repr for ty::TraitDef {
710 fn repr(&self, tcx: &ctxt) -> String {
711 format!("TraitDef(generics={}, bounds={}, trait_ref={})",
712 self.generics.repr(tcx),
713 self.bounds.repr(tcx),
714 self.trait_ref.repr(tcx))
718 impl Repr for ast::Expr {
719 fn repr(&self, _tcx: &ctxt) -> String {
720 format!("expr({}: {})", self.id, pprust::expr_to_string(self))
724 impl Repr for ast::Path {
725 fn repr(&self, _tcx: &ctxt) -> String {
726 format!("path({})", pprust::path_to_string(self))
730 impl UserString for ast::Path {
731 fn user_string(&self, _tcx: &ctxt) -> String {
732 pprust::path_to_string(self)
736 impl Repr for ast::Item {
737 fn repr(&self, tcx: &ctxt) -> String {
738 format!("item({})", tcx.map.node_to_string(self.id))
742 impl Repr for ast::Lifetime {
743 fn repr(&self, _tcx: &ctxt) -> String {
744 format!("lifetime({}: {})", self.id, pprust::lifetime_to_string(self))
748 impl Repr for ast::Stmt {
749 fn repr(&self, _tcx: &ctxt) -> String {
750 format!("stmt({}: {})",
751 ast_util::stmt_id(self),
752 pprust::stmt_to_string(self))
756 impl Repr for ast::Pat {
757 fn repr(&self, _tcx: &ctxt) -> String {
758 format!("pat({}: {})", self.id, pprust::pat_to_string(self))
762 impl Repr for ty::BoundRegion {
763 fn repr(&self, tcx: &ctxt) -> String {
765 ty::BrAnon(id) => format!("BrAnon({})", id),
766 ty::BrNamed(id, name) => {
767 format!("BrNamed({}, {})", id.repr(tcx), token::get_name(name))
769 ty::BrFresh(id) => format!("BrFresh({})", id),
774 impl Repr for ty::Region {
775 fn repr(&self, tcx: &ctxt) -> String {
777 ty::ReEarlyBound(id, space, index, name) => {
778 format!("ReEarlyBound({}, {}, {}, {})",
782 token::get_name(name))
785 ty::ReLateBound(binder_id, ref bound_region) => {
786 format!("ReLateBound({}, {})",
788 bound_region.repr(tcx))
791 ty::ReFree(ref fr) => fr.repr(tcx),
794 format!("ReScope({})", id)
798 "ReStatic".to_string()
801 ty::ReInfer(ReVar(ref vid)) => {
802 format!("ReInfer({})", vid.index)
805 ty::ReInfer(ReSkolemized(id, ref bound_region)) => {
806 format!("re_skolemized({}, {})", id, bound_region.repr(tcx))
810 "ReEmpty".to_string()
816 impl UserString for ty::Region {
817 fn user_string(&self, tcx: &ctxt) -> String {
818 region_to_string(tcx, "", false, *self)
822 impl Repr for ty::FreeRegion {
823 fn repr(&self, tcx: &ctxt) -> String {
824 format!("ReFree({}, {})",
826 self.bound_region.repr(tcx))
830 impl Repr for ast::DefId {
831 fn repr(&self, tcx: &ctxt) -> String {
832 // Unfortunately, there seems to be no way to attempt to print
833 // a path for a def-id, so I'll just make a best effort for now
834 // and otherwise fallback to just printing the crate/node pair
835 if self.krate == ast::LOCAL_CRATE {
836 match tcx.map.find(self.node) {
837 Some(ast_map::NodeItem(..)) |
838 Some(ast_map::NodeForeignItem(..)) |
839 Some(ast_map::NodeImplItem(..)) |
840 Some(ast_map::NodeTraitItem(..)) |
841 Some(ast_map::NodeVariant(..)) |
842 Some(ast_map::NodeStructCtor(..)) => {
846 ty::item_path_str(tcx, *self))
851 return format!("{:?}", *self)
855 impl Repr for ty::Polytype {
856 fn repr(&self, tcx: &ctxt) -> String {
857 format!("Polytype {{generics: {}, ty: {}}}",
858 self.generics.repr(tcx),
863 impl Repr for ty::Generics {
864 fn repr(&self, tcx: &ctxt) -> String {
865 format!("Generics(types: {}, regions: {})",
866 self.types.repr(tcx),
867 self.regions.repr(tcx))
871 impl Repr for ty::ItemVariances {
872 fn repr(&self, tcx: &ctxt) -> String {
873 format!("ItemVariances(types={}, \
875 self.types.repr(tcx),
876 self.regions.repr(tcx))
880 impl Repr for ty::Variance {
881 fn repr(&self, _: &ctxt) -> String {
882 // The first `.to_string()` returns a &'static str (it is not an implementation
883 // of the ToString trait). Because of that, we need to call `.to_string()` again
884 // if we want to have a `String`.
885 let result: &'static str = (*self).to_string();
890 impl Repr for ty::Method {
891 fn repr(&self, tcx: &ctxt) -> String {
892 format!("method(ident: {}, generics: {}, fty: {}, \
893 explicit_self: {}, vis: {}, def_id: {})",
894 self.ident.repr(tcx),
895 self.generics.repr(tcx),
897 self.explicit_self.repr(tcx),
899 self.def_id.repr(tcx))
903 impl Repr for ast::Name {
904 fn repr(&self, _tcx: &ctxt) -> String {
905 token::get_name(*self).get().to_string()
909 impl UserString for ast::Name {
910 fn user_string(&self, _tcx: &ctxt) -> String {
911 token::get_name(*self).get().to_string()
915 impl Repr for ast::Ident {
916 fn repr(&self, _tcx: &ctxt) -> String {
917 token::get_ident(*self).get().to_string()
921 impl Repr for ast::ExplicitSelf_ {
922 fn repr(&self, _tcx: &ctxt) -> String {
923 format!("{:?}", *self)
927 impl Repr for ast::Visibility {
928 fn repr(&self, _tcx: &ctxt) -> String {
929 format!("{:?}", *self)
933 impl Repr for ty::BareFnTy {
934 fn repr(&self, tcx: &ctxt) -> String {
935 format!("BareFnTy {{fn_style: {:?}, abi: {}, sig: {}}}",
937 self.abi.to_string(),
942 impl Repr for ty::FnSig {
943 fn repr(&self, tcx: &ctxt) -> String {
944 fn_sig_to_string(tcx, self)
948 impl Repr for typeck::MethodCallee {
949 fn repr(&self, tcx: &ctxt) -> String {
950 format!("MethodCallee {{origin: {}, ty: {}, {}}}",
951 self.origin.repr(tcx),
953 self.substs.repr(tcx))
957 impl Repr for typeck::MethodOrigin {
958 fn repr(&self, tcx: &ctxt) -> String {
960 &typeck::MethodStatic(def_id) => {
961 format!("MethodStatic({})", def_id.repr(tcx))
963 &typeck::MethodStaticUnboxedClosure(def_id) => {
964 format!("MethodStaticUnboxedClosure({})", def_id.repr(tcx))
966 &typeck::MethodTypeParam(ref p) => {
969 &typeck::MethodTraitObject(ref p) => {
976 impl Repr for typeck::MethodParam {
977 fn repr(&self, tcx: &ctxt) -> String {
978 format!("MethodParam({},{})",
979 self.trait_ref.repr(tcx),
984 impl Repr for typeck::MethodObject {
985 fn repr(&self, tcx: &ctxt) -> String {
986 format!("MethodObject({},{:?},{:?})",
987 self.trait_ref.repr(tcx),
993 impl Repr for ty::TraitStore {
994 fn repr(&self, tcx: &ctxt) -> String {
995 trait_store_to_string(tcx, *self)
999 impl Repr for ty::BuiltinBound {
1000 fn repr(&self, _tcx: &ctxt) -> String {
1001 format!("{:?}", *self)
1005 impl UserString for ty::BuiltinBound {
1006 fn user_string(&self, _tcx: &ctxt) -> String {
1008 ty::BoundSend => "Send".to_owned(),
1009 ty::BoundSized => "Sized".to_owned(),
1010 ty::BoundCopy => "Copy".to_owned(),
1011 ty::BoundSync => "Sync".to_owned(),
1016 impl Repr for Span {
1017 fn repr(&self, tcx: &ctxt) -> String {
1018 tcx.sess.codemap().span_to_string(*self).to_string()
1022 impl<A:UserString> UserString for Rc<A> {
1023 fn user_string(&self, tcx: &ctxt) -> String {
1024 let this: &A = &**self;
1025 this.user_string(tcx)
1029 impl UserString for ty::ParamBounds {
1030 fn user_string(&self, tcx: &ctxt) -> String {
1031 let mut result = Vec::new();
1032 let s = self.builtin_bounds.user_string(tcx);
1036 for n in self.trait_bounds.iter() {
1037 result.push(n.user_string(tcx));
1043 impl UserString for ty::ExistentialBounds {
1044 fn user_string(&self, tcx: &ctxt) -> String {
1045 if self.builtin_bounds.contains_elem(ty::BoundSend) &&
1046 self.region_bound == ty::ReStatic
1047 { // Region bound is implied by builtin bounds:
1048 return self.builtin_bounds.repr(tcx);
1051 let mut res = Vec::new();
1053 let region_str = self.region_bound.user_string(tcx);
1054 if !region_str.is_empty() {
1055 res.push(region_str);
1058 for bound in self.builtin_bounds.iter() {
1059 res.push(bound.user_string(tcx));
1066 impl UserString for ty::BuiltinBounds {
1067 fn user_string(&self, tcx: &ctxt) -> String {
1069 .map(|bb| bb.user_string(tcx))
1070 .collect::<Vec<String>>()
1076 impl UserString for ty::TraitRef {
1077 fn user_string(&self, tcx: &ctxt) -> String {
1078 let base = ty::item_path_str(tcx, self.def_id);
1079 let trait_def = ty::lookup_trait_def(tcx, self.def_id);
1080 parameterized(tcx, base.as_slice(), &self.substs, &trait_def.generics)
1084 impl UserString for ty::t {
1085 fn user_string(&self, tcx: &ctxt) -> String {
1086 ty_to_string(tcx, *self)
1090 impl UserString for ast::Ident {
1091 fn user_string(&self, _tcx: &ctxt) -> String {
1092 token::get_name(self.name).get().to_string()
1096 impl Repr for abi::Abi {
1097 fn repr(&self, _tcx: &ctxt) -> String {
1102 impl UserString for abi::Abi {
1103 fn user_string(&self, _tcx: &ctxt) -> String {
1108 impl Repr for ty::UpvarId {
1109 fn repr(&self, tcx: &ctxt) -> String {
1110 format!("UpvarId({};`{}`;{})",
1112 ty::local_var_name_str(tcx, self.var_id),
1113 self.closure_expr_id)
1117 impl Repr for ast::Mutability {
1118 fn repr(&self, _tcx: &ctxt) -> String {
1119 format!("{:?}", *self)
1123 impl Repr for ty::BorrowKind {
1124 fn repr(&self, _tcx: &ctxt) -> String {
1125 format!("{:?}", *self)
1129 impl Repr for ty::UpvarBorrow {
1130 fn repr(&self, tcx: &ctxt) -> String {
1131 format!("UpvarBorrow({}, {})",
1132 self.kind.repr(tcx),
1133 self.region.repr(tcx))
1137 impl Repr for ty::IntVid {
1138 fn repr(&self, _tcx: &ctxt) -> String {
1143 impl Repr for ty::FloatVid {
1144 fn repr(&self, _tcx: &ctxt) -> String {
1149 impl Repr for ty::RegionVid {
1150 fn repr(&self, _tcx: &ctxt) -> String {
1155 impl Repr for ty::TyVid {
1156 fn repr(&self, _tcx: &ctxt) -> String {
1161 impl Repr for ty::IntVarValue {
1162 fn repr(&self, _tcx: &ctxt) -> String {
1163 format!("{:?}", *self)
1167 impl Repr for ast::IntTy {
1168 fn repr(&self, _tcx: &ctxt) -> String {
1169 format!("{:?}", *self)
1173 impl Repr for ast::UintTy {
1174 fn repr(&self, _tcx: &ctxt) -> String {
1175 format!("{:?}", *self)
1179 impl Repr for ast::FloatTy {
1180 fn repr(&self, _tcx: &ctxt) -> String {
1181 format!("{:?}", *self)
1185 impl Repr for ty::ExplicitSelfCategory {
1186 fn repr(&self, _: &ctxt) -> String {
1187 explicit_self_category_to_str(self).to_string()
1192 impl Repr for regionmanip::WfConstraint {
1193 fn repr(&self, tcx: &ctxt) -> String {
1195 regionmanip::RegionSubRegionConstraint(_, r_a, r_b) => {
1196 format!("RegionSubRegionConstraint({}, {})",
1201 regionmanip::RegionSubParamConstraint(_, r, p) => {
1202 format!("RegionSubParamConstraint({}, {})",
1210 impl UserString for ParamTy {
1211 fn user_string(&self, tcx: &ctxt) -> String {
1213 let did = self.def_id;
1214 let ident = match tcx.ty_param_defs.borrow().find(&did.node) {
1215 Some(def) => token::get_ident(def.ident).get().to_string(),
1217 // This can only happen when a type mismatch error happens and
1218 // the actual type has more type parameters than the expected one.
1219 None => format!("<generic #{}>", id),
1225 impl Repr for ParamTy {
1226 fn repr(&self, tcx: &ctxt) -> String {
1227 self.user_string(tcx)
1231 impl<A:Repr,B:Repr> Repr for (A,B) {
1232 fn repr(&self, tcx: &ctxt) -> String {
1233 let &(ref a, ref b) = self;
1234 format!("({},{})", a.repr(tcx), b.repr(tcx))