1 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
2 use rustc_data_structures::sync::{self, Lrc};
3 use rustc_driver::abort_on_err;
4 use rustc_errors::emitter::{Emitter, EmitterWriter};
5 use rustc_errors::json::JsonEmitter;
6 use rustc_feature::UnstableFeatures;
7 use rustc_hir::def::Res;
8 use rustc_hir::def_id::{DefId, LocalDefId};
9 use rustc_hir::HirId;
10 use rustc_hir::{
11 intravisit::{self, NestedVisitorMap, Visitor},
12 Path,
13 };
14 use rustc_interface::{interface, Queries};
15 use rustc_middle::hir::map::Map;
16 use rustc_middle::middle::privacy::AccessLevels;
17 use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
18 use rustc_resolve as resolve;
19 use rustc_resolve::Namespace::TypeNS;
20 use rustc_session::config::{self, CrateType, ErrorOutputType};
21 use rustc_session::lint;
22 use rustc_session::DiagnosticOutput;
23 use rustc_session::Session;
24 use rustc_span::def_id::CRATE_DEF_INDEX;
25 use rustc_span::source_map;
26 use rustc_span::symbol::sym;
27 use rustc_span::{Span, DUMMY_SP};
28
29 use std::cell::RefCell;
30 use std::lazy::SyncLazy;
31 use std::mem;
32 use std::rc::Rc;
33
34 use crate::clean::inline::build_external_trait;
35 use crate::clean::{self, ItemId, TraitWithExtraInfo};
36 use crate::config::{Options as RustdocOptions, OutputFormat, RenderOptions};
37 use crate::formats::cache::Cache;
38 use crate::passes::{self, Condition::*, ConditionalPass};
39
40 crate use rustc_session::config::{DebuggingOptions, Input, Options};
41
42 crate struct DocContext<'tcx> {
43 crate tcx: TyCtxt<'tcx>,
44 /// Name resolver. Used for intra-doc links.
45 ///
46 /// The `Rc<RefCell<...>>` wrapping is needed because that is what's returned by
47 /// [`Queries::expansion()`].
48 // FIXME: see if we can get rid of this RefCell somehow
49 crate resolver: Rc<RefCell<interface::BoxedResolver>>,
50 /// Used for normalization.
51 ///
52 /// Most of this logic is copied from rustc_lint::late.
53 crate param_env: ParamEnv<'tcx>,
54 /// Later on moved through `clean::Crate` into `cache`
55 crate external_traits: Rc<RefCell<FxHashMap<DefId, clean::TraitWithExtraInfo>>>,
56 /// Used while populating `external_traits` to ensure we don't process the same trait twice at
57 /// the same time.
58 crate active_extern_traits: FxHashSet<DefId>,
59 // The current set of parameter substitutions,
60 // for expanding type aliases at the HIR level:
61 /// Table `DefId` of type, lifetime, or const parameter -> substituted type, lifetime, or const
62 crate substs: FxHashMap<DefId, clean::SubstParam>,
63 /// Table synthetic type parameter for `impl Trait` in argument position -> bounds
64 crate impl_trait_bounds: FxHashMap<ImplTraitParam, Vec<clean::GenericBound>>,
65 /// Auto-trait or blanket impls processed so far, as `(self_ty, trait_def_id)`.
66 // FIXME(eddyb) make this a `ty::TraitRef<'tcx>` set.
67 crate generated_synthetics: FxHashSet<(Ty<'tcx>, DefId)>,
68 crate auto_traits: Vec<DefId>,
69 /// The options given to rustdoc that could be relevant to a pass.
70 crate render_options: RenderOptions,
71 /// The traits in scope for a given module.
72 ///
73 /// See `collect_intra_doc_links::traits_implemented_by` for more details.
74 /// `map<module, set<trait>>`
75 crate module_trait_cache: FxHashMap<DefId, FxHashSet<DefId>>,
76 /// This same cache is used throughout rustdoc, including in [`crate::html::render`].
77 crate cache: Cache,
78 /// Used by [`clean::inline`] to tell if an item has already been inlined.
79 crate inlined: FxHashSet<ItemId>,
80 /// Used by `calculate_doc_coverage`.
81 crate output_format: OutputFormat,
82 }
83
84 impl<'tcx> DocContext<'tcx> {
sess(&self) -> &'tcx Session85 crate fn sess(&self) -> &'tcx Session {
86 self.tcx.sess
87 }
88
with_param_env<T, F: FnOnce(&mut Self) -> T>(&mut self, def_id: DefId, f: F) -> T89 crate fn with_param_env<T, F: FnOnce(&mut Self) -> T>(&mut self, def_id: DefId, f: F) -> T {
90 let old_param_env = mem::replace(&mut self.param_env, self.tcx.param_env(def_id));
91 let ret = f(self);
92 self.param_env = old_param_env;
93 ret
94 }
95
enter_resolver<F, R>(&self, f: F) -> R where F: FnOnce(&mut resolve::Resolver<'_>) -> R,96 crate fn enter_resolver<F, R>(&self, f: F) -> R
97 where
98 F: FnOnce(&mut resolve::Resolver<'_>) -> R,
99 {
100 self.resolver.borrow_mut().access(f)
101 }
102
103 /// Call the closure with the given parameters set as
104 /// the substitutions for a type alias' RHS.
enter_alias<F, R>(&mut self, substs: FxHashMap<DefId, clean::SubstParam>, f: F) -> R where F: FnOnce(&mut Self) -> R,105 crate fn enter_alias<F, R>(&mut self, substs: FxHashMap<DefId, clean::SubstParam>, f: F) -> R
106 where
107 F: FnOnce(&mut Self) -> R,
108 {
109 let old_substs = mem::replace(&mut self.substs, substs);
110 let r = f(self);
111 self.substs = old_substs;
112 r
113 }
114
115 /// Like `hir().local_def_id_to_hir_id()`, but skips calling it on fake DefIds.
116 /// (This avoids a slice-index-out-of-bounds panic.)
as_local_hir_id(tcx: TyCtxt<'_>, def_id: ItemId) -> Option<HirId>117 crate fn as_local_hir_id(tcx: TyCtxt<'_>, def_id: ItemId) -> Option<HirId> {
118 match def_id {
119 ItemId::DefId(real_id) => {
120 real_id.as_local().map(|def_id| tcx.hir().local_def_id_to_hir_id(def_id))
121 }
122 // FIXME: Can this be `Some` for `Auto` or `Blanket`?
123 _ => None,
124 }
125 }
126 }
127
128 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
129 ///
130 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
131 /// will be created for the handler.
new_handler( error_format: ErrorOutputType, source_map: Option<Lrc<source_map::SourceMap>>, debugging_opts: &DebuggingOptions, ) -> rustc_errors::Handler132 crate fn new_handler(
133 error_format: ErrorOutputType,
134 source_map: Option<Lrc<source_map::SourceMap>>,
135 debugging_opts: &DebuggingOptions,
136 ) -> rustc_errors::Handler {
137 let emitter: Box<dyn Emitter + sync::Send> = match error_format {
138 ErrorOutputType::HumanReadable(kind) => {
139 let (short, color_config) = kind.unzip();
140 Box::new(
141 EmitterWriter::stderr(
142 color_config,
143 source_map.map(|sm| sm as _),
144 short,
145 debugging_opts.teach,
146 debugging_opts.terminal_width,
147 false,
148 )
149 .ui_testing(debugging_opts.ui_testing),
150 )
151 }
152 ErrorOutputType::Json { pretty, json_rendered } => {
153 let source_map = source_map.unwrap_or_else(|| {
154 Lrc::new(source_map::SourceMap::new(source_map::FilePathMapping::empty()))
155 });
156 Box::new(
157 JsonEmitter::stderr(
158 None,
159 source_map,
160 pretty,
161 json_rendered,
162 debugging_opts.terminal_width,
163 false,
164 )
165 .ui_testing(debugging_opts.ui_testing),
166 )
167 }
168 };
169
170 rustc_errors::Handler::with_emitter_and_flags(
171 emitter,
172 debugging_opts.diagnostic_handler_flags(true),
173 )
174 }
175
176 /// Parse, resolve, and typecheck the given crate.
177 crate fn create_config(
178 RustdocOptions {
179 input,
180 crate_name,
181 proc_macro_crate,
182 error_format,
183 libs,
184 externs,
185 mut cfgs,
186 codegen_options,
187 debugging_opts,
188 target,
189 edition,
190 maybe_sysroot,
191 lint_opts,
192 describe_lints,
193 lint_cap,
194 ..
195 }: RustdocOptions,
196 ) -> rustc_interface::Config {
197 // Add the doc cfg into the doc build.
198 cfgs.push("doc".to_string());
199
200 let cpath = Some(input.clone());
201 let input = Input::File(input);
202
203 // By default, rustdoc ignores all lints.
204 // Specifically unblock lints relevant to documentation or the lint machinery itself.
205 let mut lints_to_show = vec![
206 // it's unclear whether these should be part of rustdoc directly (#77364)
207 rustc_lint::builtin::MISSING_DOCS.name.to_string(),
208 rustc_lint::builtin::INVALID_DOC_ATTRIBUTES.name.to_string(),
209 // these are definitely not part of rustdoc, but we want to warn on them anyway.
210 rustc_lint::builtin::RENAMED_AND_REMOVED_LINTS.name.to_string(),
211 rustc_lint::builtin::UNKNOWN_LINTS.name.to_string(),
212 ];
213 lints_to_show.extend(crate::lint::RUSTDOC_LINTS.iter().map(|lint| lint.name.to_string()));
214
215 let (lint_opts, lint_caps) = crate::lint::init_lints(lints_to_show, lint_opts, |lint| {
216 Some((lint.name_lower(), lint::Allow))
217 });
218
219 let crate_types =
220 if proc_macro_crate { vec![CrateType::ProcMacro] } else { vec![CrateType::Rlib] };
221 // plays with error output here!
222 let sessopts = config::Options {
223 maybe_sysroot,
224 search_paths: libs,
225 crate_types,
226 lint_opts,
227 lint_cap,
228 cg: codegen_options,
229 externs,
230 target_triple: target,
231 unstable_features: UnstableFeatures::from_environment(crate_name.as_deref()),
232 actually_rustdoc: true,
233 debugging_opts,
234 error_format,
235 edition,
236 describe_lints,
237 crate_name,
238 ..Options::default()
239 };
240
241 interface::Config {
242 opts: sessopts,
243 crate_cfg: interface::parse_cfgspecs(cfgs),
244 input,
245 input_path: cpath,
246 output_file: None,
247 output_dir: None,
248 file_loader: None,
249 diagnostic_output: DiagnosticOutput::Default,
250 stderr: None,
251 lint_caps,
252 parse_sess_created: None,
253 register_lints: Some(box crate::lint::register_lints),
254 override_queries: Some(|_sess, providers, _external_providers| {
255 // Most lints will require typechecking, so just don't run them.
256 providers.lint_mod = |_, _| {};
257 // Prevent `rustc_typeck::check_crate` from calling `typeck` on all bodies.
258 providers.typeck_item_bodies = |_, _| {};
259 // hack so that `used_trait_imports` won't try to call typeck
260 providers.used_trait_imports = |_, _| {
261 static EMPTY_SET: SyncLazy<FxHashSet<LocalDefId>> =
262 SyncLazy::new(FxHashSet::default);
263 &EMPTY_SET
264 };
265 // In case typeck does end up being called, don't ICE in case there were name resolution errors
266 providers.typeck = move |tcx, def_id| {
267 // Closures' tables come from their outermost function,
268 // as they are part of the same "inference environment".
269 // This avoids emitting errors for the parent twice (see similar code in `typeck_with_fallback`)
270 let typeck_root_def_id = tcx.typeck_root_def_id(def_id.to_def_id()).expect_local();
271 if typeck_root_def_id != def_id {
272 return tcx.typeck(typeck_root_def_id);
273 }
274
275 let hir = tcx.hir();
276 let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(def_id)));
277 debug!("visiting body for {:?}", def_id);
278 EmitIgnoredResolutionErrors::new(tcx).visit_body(body);
279 (rustc_interface::DEFAULT_QUERY_PROVIDERS.typeck)(tcx, def_id)
280 };
281 }),
282 make_codegen_backend: None,
283 registry: rustc_driver::diagnostics_registry(),
284 }
285 }
286
create_resolver<'a>( externs: config::Externs, queries: &Queries<'a>, sess: &Session, ) -> Rc<RefCell<interface::BoxedResolver>>287 crate fn create_resolver<'a>(
288 externs: config::Externs,
289 queries: &Queries<'a>,
290 sess: &Session,
291 ) -> Rc<RefCell<interface::BoxedResolver>> {
292 let (krate, resolver, _) = &*abort_on_err(queries.expansion(), sess).peek();
293 let resolver = resolver.clone();
294
295 let resolver = crate::passes::collect_intra_doc_links::load_intra_link_crates(resolver, krate);
296
297 // FIXME: somehow rustdoc is still missing crates even though we loaded all
298 // the known necessary crates. Load them all unconditionally until we find a way to fix this.
299 // DO NOT REMOVE THIS without first testing on the reproducer in
300 // https://github.com/jyn514/objr/commit/edcee7b8124abf0e4c63873e8422ff81beb11ebb
301 let extern_names: Vec<String> = externs
302 .iter()
303 .filter(|(_, entry)| entry.add_prelude)
304 .map(|(name, _)| name)
305 .cloned()
306 .collect();
307 resolver.borrow_mut().access(|resolver| {
308 sess.time("load_extern_crates", || {
309 for extern_name in &extern_names {
310 debug!("loading extern crate {}", extern_name);
311 if let Err(()) = resolver
312 .resolve_str_path_error(
313 DUMMY_SP,
314 extern_name,
315 TypeNS,
316 LocalDefId { local_def_index: CRATE_DEF_INDEX }.to_def_id(),
317 ) {
318 warn!("unable to resolve external crate {} (do you have an unused `--extern` crate?)", extern_name)
319 }
320 }
321 });
322 });
323
324 resolver
325 }
326
run_global_ctxt( tcx: TyCtxt<'_>, resolver: Rc<RefCell<interface::BoxedResolver>>, mut default_passes: passes::DefaultPassOption, manual_passes: Vec<String>, render_options: RenderOptions, output_format: OutputFormat, ) -> (clean::Crate, RenderOptions, Cache)327 crate fn run_global_ctxt(
328 tcx: TyCtxt<'_>,
329 resolver: Rc<RefCell<interface::BoxedResolver>>,
330 mut default_passes: passes::DefaultPassOption,
331 manual_passes: Vec<String>,
332 render_options: RenderOptions,
333 output_format: OutputFormat,
334 ) -> (clean::Crate, RenderOptions, Cache) {
335 // Certain queries assume that some checks were run elsewhere
336 // (see https://github.com/rust-lang/rust/pull/73566#issuecomment-656954425),
337 // so type-check everything other than function bodies in this crate before running lints.
338
339 // NOTE: this does not call `tcx.analysis()` so that we won't
340 // typeck function bodies or run the default rustc lints.
341 // (see `override_queries` in the `config`)
342
343 // HACK(jynelson) this calls an _extremely_ limited subset of `typeck`
344 // and might break if queries change their assumptions in the future.
345
346 // NOTE: This is copy/pasted from typeck/lib.rs and should be kept in sync with those changes.
347 tcx.sess.time("item_types_checking", || {
348 tcx.hir().for_each_module(|module| tcx.ensure().check_mod_item_types(module))
349 });
350 tcx.sess.abort_if_errors();
351 tcx.sess.time("missing_docs", || {
352 rustc_lint::check_crate(tcx, rustc_lint::builtin::MissingDoc::new);
353 });
354 tcx.sess.time("check_mod_attrs", || {
355 tcx.hir().for_each_module(|module| tcx.ensure().check_mod_attrs(module))
356 });
357 rustc_passes::stability::check_unused_or_stable_features(tcx);
358
359 let access_levels = AccessLevels {
360 map: tcx.privacy_access_levels(()).map.iter().map(|(k, v)| (k.to_def_id(), *v)).collect(),
361 };
362
363 let mut ctxt = DocContext {
364 tcx,
365 resolver,
366 param_env: ParamEnv::empty(),
367 external_traits: Default::default(),
368 active_extern_traits: Default::default(),
369 substs: Default::default(),
370 impl_trait_bounds: Default::default(),
371 generated_synthetics: Default::default(),
372 auto_traits: tcx
373 .all_traits(())
374 .iter()
375 .cloned()
376 .filter(|trait_def_id| tcx.trait_is_auto(*trait_def_id))
377 .collect(),
378 module_trait_cache: FxHashMap::default(),
379 cache: Cache::new(access_levels, render_options.document_private),
380 inlined: FxHashSet::default(),
381 output_format,
382 render_options,
383 };
384
385 // Small hack to force the Sized trait to be present.
386 //
387 // Note that in case of `#![no_core]`, the trait is not available.
388 if let Some(sized_trait_did) = ctxt.tcx.lang_items().sized_trait() {
389 let mut sized_trait = build_external_trait(&mut ctxt, sized_trait_did);
390 sized_trait.is_auto = true;
391 ctxt.external_traits
392 .borrow_mut()
393 .insert(sized_trait_did, TraitWithExtraInfo { trait_: sized_trait, is_notable: false });
394 }
395
396 debug!("crate: {:?}", tcx.hir().krate());
397
398 let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
399
400 if krate.module.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
401 let help = format!(
402 "The following guide may be of use:\n\
403 {}/rustdoc/how-to-write-documentation.html",
404 crate::DOC_RUST_LANG_ORG_CHANNEL
405 );
406 tcx.struct_lint_node(
407 crate::lint::MISSING_CRATE_LEVEL_DOCS,
408 DocContext::as_local_hir_id(tcx, krate.module.def_id).unwrap(),
409 |lint| {
410 let mut diag =
411 lint.build("no documentation found for this crate's top-level module");
412 diag.help(&help);
413 diag.emit();
414 },
415 );
416 }
417
418 fn report_deprecated_attr(name: &str, diag: &rustc_errors::Handler, sp: Span) {
419 let mut msg =
420 diag.struct_span_warn(sp, &format!("the `#![doc({})]` attribute is deprecated", name));
421 msg.note(
422 "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
423 for more information",
424 );
425
426 if name == "no_default_passes" {
427 msg.help("you may want to use `#![doc(document_private_items)]`");
428 } else if name.starts_with("plugins") {
429 msg.warn("`#![doc(plugins = \"...\")]` no longer functions; see CVE-2018-1000622 <https://nvd.nist.gov/vuln/detail/CVE-2018-1000622>");
430 }
431
432 msg.emit();
433 }
434
435 let parse_pass = |name: &str, sp: Option<Span>| {
436 if let Some(pass) = passes::find_pass(name) {
437 Some(ConditionalPass::always(pass))
438 } else {
439 let msg = &format!("ignoring unknown pass `{}`", name);
440 let mut warning = if let Some(sp) = sp {
441 tcx.sess.struct_span_warn(sp, msg)
442 } else {
443 tcx.sess.struct_warn(msg)
444 };
445 if name == "collapse-docs" {
446 warning.note("the `collapse-docs` pass was removed in #80261 <https://github.com/rust-lang/rust/pull/80261>");
447 }
448 warning.emit();
449 None
450 }
451 };
452
453 let mut manual_passes: Vec<_> =
454 manual_passes.into_iter().flat_map(|name| parse_pass(&name, None)).collect();
455
456 // Process all of the crate attributes, extracting plugin metadata along
457 // with the passes which we are supposed to run.
458 for attr in krate.module.attrs.lists(sym::doc) {
459 let diag = ctxt.sess().diagnostic();
460
461 let name = attr.name_or_empty();
462 if attr.is_word() {
463 if name == sym::no_default_passes {
464 report_deprecated_attr("no_default_passes", diag, attr.span());
465 if default_passes == passes::DefaultPassOption::Default {
466 default_passes = passes::DefaultPassOption::None;
467 }
468 }
469 } else if let Some(value) = attr.value_str() {
470 match name {
471 sym::passes => {
472 report_deprecated_attr("passes = \"...\"", diag, attr.span());
473 }
474 sym::plugins => {
475 report_deprecated_attr("plugins = \"...\"", diag, attr.span());
476 continue;
477 }
478 _ => continue,
479 };
480 for name in value.as_str().split_whitespace() {
481 let span = attr.name_value_literal_span().unwrap_or_else(|| attr.span());
482 manual_passes.extend(parse_pass(name, Some(span)));
483 }
484 }
485
486 if attr.is_word() && name == sym::document_private_items {
487 ctxt.render_options.document_private = true;
488 }
489 }
490
491 let passes = passes::defaults(default_passes).iter().copied().chain(manual_passes);
492 info!("Executing passes");
493
494 for p in passes {
495 let run = match p.condition {
496 Always => true,
497 WhenDocumentPrivate => ctxt.render_options.document_private,
498 WhenNotDocumentPrivate => !ctxt.render_options.document_private,
499 WhenNotDocumentHidden => !ctxt.render_options.document_hidden,
500 };
501 if run {
502 debug!("running pass {}", p.pass.name);
503 krate = tcx.sess.time(p.pass.name, || (p.pass.run)(krate, &mut ctxt));
504 }
505 }
506
507 if tcx.sess.diagnostic().has_errors_or_lint_errors() {
508 rustc_errors::FatalError.raise();
509 }
510
511 krate = tcx.sess.time("create_format_cache", || Cache::populate(&mut ctxt, krate));
512
513 // The main crate doc comments are always collapsed.
514 krate.collapsed = true;
515
516 (krate, ctxt.render_options, ctxt.cache)
517 }
518
519 /// Due to <https://github.com/rust-lang/rust/pull/73566>,
520 /// the name resolution pass may find errors that are never emitted.
521 /// If typeck is called after this happens, then we'll get an ICE:
522 /// 'Res::Error found but not reported'. To avoid this, emit the errors now.
523 struct EmitIgnoredResolutionErrors<'tcx> {
524 tcx: TyCtxt<'tcx>,
525 }
526
527 impl<'tcx> EmitIgnoredResolutionErrors<'tcx> {
new(tcx: TyCtxt<'tcx>) -> Self528 fn new(tcx: TyCtxt<'tcx>) -> Self {
529 Self { tcx }
530 }
531 }
532
533 impl<'tcx> Visitor<'tcx> for EmitIgnoredResolutionErrors<'tcx> {
534 type Map = Map<'tcx>;
535
nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map>536 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
537 // We need to recurse into nested closures,
538 // since those will fallback to the parent for type checking.
539 NestedVisitorMap::OnlyBodies(self.tcx.hir())
540 }
541
visit_path(&mut self, path: &'tcx Path<'_>, _id: HirId)542 fn visit_path(&mut self, path: &'tcx Path<'_>, _id: HirId) {
543 debug!("visiting path {:?}", path);
544 if path.res == Res::Err {
545 // We have less context here than in rustc_resolve,
546 // so we can only emit the name and span.
547 // However we can give a hint that rustc_resolve will have more info.
548 let label = format!(
549 "could not resolve path `{}`",
550 path.segments
551 .iter()
552 .map(|segment| segment.ident.as_str().to_string())
553 .collect::<Vec<_>>()
554 .join("::")
555 );
556 let mut err = rustc_errors::struct_span_err!(
557 self.tcx.sess,
558 path.span,
559 E0433,
560 "failed to resolve: {}",
561 label
562 );
563 err.span_label(path.span, label);
564 err.note("this error was originally ignored because you are running `rustdoc`");
565 err.note("try running again with `rustc` or `cargo check` and you may get a more detailed error");
566 err.emit();
567 }
568 // We could have an outer resolution that succeeded,
569 // but with generic parameters that failed.
570 // Recurse into the segments so we catch those too.
571 intravisit::walk_path(self, path);
572 }
573 }
574
575 /// `DefId` or parameter index (`ty::ParamTy.index`) of a synthetic type parameter
576 /// for `impl Trait` in argument position.
577 #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
578 crate enum ImplTraitParam {
579 DefId(DefId),
580 ParamIndex(u32),
581 }
582
583 impl From<DefId> for ImplTraitParam {
from(did: DefId) -> Self584 fn from(did: DefId) -> Self {
585 ImplTraitParam::DefId(did)
586 }
587 }
588
589 impl From<u32> for ImplTraitParam {
from(idx: u32) -> Self590 fn from(idx: u32) -> Self {
591 ImplTraitParam::ParamIndex(idx)
592 }
593 }
594