1 //! After we obtain a fresh AST fragment from a macro, code in this module helps to integrate
2 //! that fragment into the module structures that are already partially built.
4 //! Items from the fragment are placed into modules,
5 //! unexpanded macros in the fragment are visited and registered.
6 //! Imports are also considered items and placed into modules here, but not resolved yet.
8 use crate::def_collector::collect_definitions;
9 use crate::imports::{Import, ImportKind};
10 use crate::macros::{MacroRulesBinding, MacroRulesScope, MacroRulesScopeRef};
11 use crate::Namespace::{self, MacroNS, TypeNS, ValueNS};
12 use crate::{Determinacy, ExternPreludeEntry, Finalize, Module, ModuleKind, ModuleOrUniformRoot};
14 MacroData, NameBinding, NameBindingKind, ParentScope, PathResult, PerNS, ResolutionError,
16 use crate::{Resolver, ResolverArenas, Segment, ToNameBinding, VisResolutionError};
18 use rustc_ast::visit::{self, AssocCtxt, Visitor};
19 use rustc_ast::{self as ast, AssocItem, AssocItemKind, MetaItemKind, StmtKind};
20 use rustc_ast::{Block, Fn, ForeignItem, ForeignItemKind, Impl, Item, ItemKind, NodeId};
21 use rustc_attr as attr;
22 use rustc_data_structures::sync::Lrc;
23 use rustc_errors::{struct_span_err, Applicability};
24 use rustc_expand::expand::AstFragment;
25 use rustc_hir::def::{self, *};
26 use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
27 use rustc_metadata::creader::LoadedMacro;
28 use rustc_middle::bug;
29 use rustc_middle::metadata::ModChild;
30 use rustc_middle::ty::{self, DefIdTree};
31 use rustc_session::cstore::CrateStore;
32 use rustc_span::hygiene::{ExpnId, LocalExpnId, MacroKind};
33 use rustc_span::source_map::respan;
34 use rustc_span::symbol::{kw, sym, Ident, Symbol};
40 type Res = def::Res<NodeId>;
42 impl<'a, Id: Into<DefId>> ToNameBinding<'a>
43 for (Module<'a>, ty::Visibility<Id>, Span, LocalExpnId)
45 fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
46 arenas.alloc_name_binding(NameBinding {
47 kind: NameBindingKind::Module(self.0),
49 vis: self.1.to_def_id(),
56 impl<'a, Id: Into<DefId>> ToNameBinding<'a> for (Res, ty::Visibility<Id>, Span, LocalExpnId) {
57 fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
58 arenas.alloc_name_binding(NameBinding {
59 kind: NameBindingKind::Res(self.0),
61 vis: self.1.to_def_id(),
68 impl<'a> Resolver<'a> {
69 /// Defines `name` in namespace `ns` of module `parent` to be `def` if it is not yet defined;
70 /// otherwise, reports an error.
71 pub(crate) fn define<T>(&mut self, parent: Module<'a>, ident: Ident, ns: Namespace, def: T)
75 let binding = def.to_name_binding(self.arenas);
76 let key = self.new_key(ident, ns);
77 if let Err(old_binding) = self.try_define(parent, key, binding) {
78 self.report_conflict(parent, ident, ns, old_binding, &binding);
82 /// Walks up the tree of definitions starting at `def_id`,
83 /// stopping at the first encountered module.
84 /// Parent block modules for arbitrary def-ids are not recorded for the local crate,
85 /// and are not preserved in metadata for foreign crates, so block modules are never
86 /// returned by this function.
88 /// For the local crate ignoring block modules may be incorrect, so use this method with care.
90 /// For foreign crates block modules can be ignored without introducing observable differences,
91 /// moreover they has to be ignored right now because they are not kept in metadata.
92 /// Foreign parent modules are used for resolving names used by foreign macros with def-site
93 /// hygiene, therefore block module ignorability relies on macros with def-site hygiene and
94 /// block module parents being unreachable from other crates.
95 /// Reachable macros with block module parents exist due to `#[macro_export] macro_rules!`,
96 /// but they cannot use def-site hygiene, so the assumption holds
97 /// (<https://github.com/rust-lang/rust/pull/77984#issuecomment-712445508>).
98 pub fn get_nearest_non_block_module(&mut self, mut def_id: DefId) -> Module<'a> {
100 match self.get_module(def_id) {
101 Some(module) => return module,
102 None => def_id = self.parent(def_id),
107 pub fn expect_module(&mut self, def_id: DefId) -> Module<'a> {
108 self.get_module(def_id).expect("argument `DefId` is not a module")
111 /// If `def_id` refers to a module (in resolver's sense, i.e. a module item, crate root, enum,
112 /// or trait), then this function returns that module's resolver representation, otherwise it
114 pub(crate) fn get_module(&mut self, def_id: DefId) -> Option<Module<'a>> {
115 if let module @ Some(..) = self.module_map.get(&def_id) {
116 return module.copied();
119 if !def_id.is_local() {
120 let def_kind = self.cstore().def_kind(def_id);
122 DefKind::Mod | DefKind::Enum | DefKind::Trait => {
123 let def_key = self.cstore().def_key(def_id);
124 let parent = def_key.parent.map(|index| {
125 self.get_nearest_non_block_module(DefId { index, krate: def_id.krate })
127 let name = if let Some(cnum) = def_id.as_crate_root() {
128 self.cstore().crate_name(cnum)
130 def_key.disambiguated_data.data.get_opt_name().expect("module without name")
133 Some(self.new_module(
135 ModuleKind::Def(def_kind, def_id, name),
136 self.cstore().module_expansion_untracked(def_id, &self.session),
137 self.cstore().get_span_untracked(def_id, &self.session),
138 // FIXME: Account for `#[no_implicit_prelude]` attributes.
139 parent.map_or(false, |module| module.no_implicit_prelude),
149 pub(crate) fn expn_def_scope(&mut self, expn_id: ExpnId) -> Module<'a> {
150 match expn_id.expn_data().macro_def_id {
151 Some(def_id) => self.macro_def_scope(def_id),
154 .and_then(|expn_id| self.ast_transform_scopes.get(&expn_id))
155 .unwrap_or(&self.graph_root),
159 pub(crate) fn macro_def_scope(&mut self, def_id: DefId) -> Module<'a> {
160 if let Some(id) = def_id.as_local() {
161 self.local_macro_def_scopes[&id]
163 self.get_nearest_non_block_module(def_id)
167 pub(crate) fn get_macro(&mut self, res: Res) -> Option<MacroData> {
169 Res::Def(DefKind::Macro(..), def_id) => Some(self.get_macro_by_def_id(def_id)),
170 Res::NonMacroAttr(_) => {
171 Some(MacroData { ext: self.non_macro_attr.clone(), macro_rules: false })
177 pub(crate) fn get_macro_by_def_id(&mut self, def_id: DefId) -> MacroData {
178 if let Some(macro_data) = self.macro_map.get(&def_id) {
179 return macro_data.clone();
182 let (ext, macro_rules) = match self.cstore().load_macro_untracked(def_id, &self.session) {
183 LoadedMacro::MacroDef(item, edition) => (
184 Lrc::new(self.compile_macro(&item, edition).0),
185 matches!(item.kind, ItemKind::MacroDef(def) if def.macro_rules),
187 LoadedMacro::ProcMacro(extz) => (Lrc::new(extz), false),
190 let macro_data = MacroData { ext, macro_rules };
191 self.macro_map.insert(def_id, macro_data.clone());
195 pub(crate) fn build_reduced_graph(
197 fragment: &AstFragment,
198 parent_scope: ParentScope<'a>,
199 ) -> MacroRulesScopeRef<'a> {
200 collect_definitions(self, fragment, parent_scope.expansion);
201 let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope };
202 fragment.visit_with(&mut visitor);
203 visitor.parent_scope.macro_rules
206 pub(crate) fn build_reduced_graph_external(&mut self, module: Module<'a>) {
208 Vec::from_iter(self.cstore().module_children_untracked(module.def_id(), self.session))
210 let parent_scope = ParentScope::module(module, self);
211 BuildReducedGraphVisitor { r: self, parent_scope }
212 .build_reduced_graph_for_external_crate_res(child);
217 struct BuildReducedGraphVisitor<'a, 'b> {
218 r: &'b mut Resolver<'a>,
219 parent_scope: ParentScope<'a>,
222 impl<'a> AsMut<Resolver<'a>> for BuildReducedGraphVisitor<'a, '_> {
223 fn as_mut(&mut self) -> &mut Resolver<'a> {
228 impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
229 fn resolve_visibility(&mut self, vis: &ast::Visibility) -> ty::Visibility {
230 self.try_resolve_visibility(vis, true).unwrap_or_else(|err| {
231 self.r.report_vis_error(err);
232 ty::Visibility::Public
236 fn try_resolve_visibility<'ast>(
238 vis: &'ast ast::Visibility,
240 ) -> Result<ty::Visibility, VisResolutionError<'ast>> {
241 let parent_scope = &self.parent_scope;
243 ast::VisibilityKind::Public => Ok(ty::Visibility::Public),
244 ast::VisibilityKind::Inherited => {
245 Ok(match self.parent_scope.module.kind {
246 // Any inherited visibility resolved directly inside an enum or trait
247 // (i.e. variants, fields, and trait items) inherits from the visibility
248 // of the enum or trait.
249 ModuleKind::Def(DefKind::Enum | DefKind::Trait, def_id, _) => {
250 self.r.visibilities[&def_id.expect_local()]
252 // Otherwise, the visibility is restricted to the nearest parent `mod` item.
253 _ => ty::Visibility::Restricted(
254 self.parent_scope.module.nearest_parent_mod().expect_local(),
258 ast::VisibilityKind::Restricted { ref path, id, .. } => {
259 // Make `PRIVATE_IN_PUBLIC` lint a hard error.
260 self.r.has_pub_restricted = true;
261 // For visibilities we are not ready to provide correct implementation of "uniform
262 // paths" right now, so on 2018 edition we only allow module-relative paths for now.
263 // On 2015 edition visibilities are resolved as crate-relative by default,
264 // so we are prepending a root segment if necessary.
265 let ident = path.segments.get(0).expect("empty path in visibility").ident;
266 let crate_root = if ident.is_path_segment_keyword() {
268 } else if ident.span.rust_2015() {
269 Some(Segment::from_ident(Ident::new(
271 path.span.shrink_to_lo().with_ctxt(ident.span.ctxt()),
274 return Err(VisResolutionError::Relative2018(ident.span, path));
277 let segments = crate_root
279 .chain(path.segments.iter().map(|seg| seg.into()))
280 .collect::<Vec<_>>();
281 let expected_found_error = |res| {
282 Err(VisResolutionError::ExpectedFound(
284 Segment::names_to_string(&segments),
288 match self.r.resolve_path(
292 finalize.then(|| Finalize::new(id, path.span)),
295 PathResult::Module(ModuleOrUniformRoot::Module(module)) => {
296 let res = module.res().expect("visibility resolved to unnamed block");
298 self.r.record_partial_res(id, PartialRes::new(res));
300 if module.is_normal() {
302 Ok(ty::Visibility::Public)
304 let vis = ty::Visibility::Restricted(res.def_id());
305 if self.r.is_accessible_from(vis, parent_scope.module) {
306 Ok(vis.expect_local())
308 Err(VisResolutionError::AncestorOnly(path.span))
312 expected_found_error(res)
315 PathResult::Module(..) => Err(VisResolutionError::ModuleOnly(path.span)),
316 PathResult::NonModule(partial_res) => {
317 expected_found_error(partial_res.expect_full_res())
319 PathResult::Failed { span, label, suggestion, .. } => {
320 Err(VisResolutionError::FailedToResolve(span, label, suggestion))
322 PathResult::Indeterminate => Err(VisResolutionError::Indeterminate(path.span)),
328 fn insert_field_names_local(&mut self, def_id: DefId, vdata: &ast::VariantData) {
329 let field_names = vdata
332 .map(|field| respan(field.span, field.ident.map_or(kw::Empty, |ident| ident.name)))
334 self.r.field_names.insert(def_id, field_names);
337 fn insert_field_names_extern(&mut self, def_id: DefId) {
339 self.r.cstore().struct_field_names_untracked(def_id, self.r.session).collect();
340 self.r.field_names.insert(def_id, field_names);
343 fn block_needs_anonymous_module(&mut self, block: &Block) -> bool {
344 // If any statements are items, we need to create an anonymous module
348 .any(|statement| matches!(statement.kind, StmtKind::Item(_) | StmtKind::MacCall(_)))
351 // Add an import to the current module.
354 module_path: Vec<Segment>,
355 kind: ImportKind<'a>,
362 let current_module = self.parent_scope.module;
363 let import = self.r.arenas.alloc_import(Import {
365 parent_scope: self.parent_scope,
367 imported_module: Cell::new(None),
370 use_span_with_attributes: item.span_with_attributes(),
371 has_attributes: !item.attrs.is_empty(),
374 vis: Cell::new(Some(vis)),
375 used: Cell::new(false),
378 self.r.indeterminate_imports.push(import);
380 // Don't add unresolved underscore imports to modules
381 ImportKind::Single { target: Ident { name: kw::Underscore, .. }, .. } => {}
382 ImportKind::Single { target, type_ns_only, .. } => {
383 self.r.per_ns(|this, ns| {
384 if !type_ns_only || ns == TypeNS {
385 let key = this.new_key(target, ns);
386 let mut resolution = this.resolution(current_module, key).borrow_mut();
387 resolution.add_single_import(import);
391 // We don't add prelude imports to the globs since they only affect lexical scopes,
392 // which are not relevant to import resolution.
393 ImportKind::Glob { is_prelude: true, .. } => {}
394 ImportKind::Glob { .. } => current_module.globs.borrow_mut().push(import),
399 fn build_reduced_graph_for_use_tree(
401 // This particular use tree
402 use_tree: &ast::UseTree,
404 parent_prefix: &[Segment],
406 // The whole `use` item
412 "build_reduced_graph_for_use_tree(parent_prefix={:?}, use_tree={:?}, nested={})",
413 parent_prefix, use_tree, nested
416 let mut prefix_iter = parent_prefix
419 .chain(use_tree.prefix.segments.iter().map(|seg| seg.into()))
422 // On 2015 edition imports are resolved as crate-relative by default,
423 // so prefixes are prepended with crate root segment if necessary.
424 // The root is prepended lazily, when the first non-empty prefix or terminating glob
425 // appears, so imports in braced groups can have roots prepended independently.
426 let is_glob = matches!(use_tree.kind, ast::UseTreeKind::Glob);
427 let crate_root = match prefix_iter.peek() {
428 Some(seg) if !seg.ident.is_path_segment_keyword() && seg.ident.span.rust_2015() => {
429 Some(seg.ident.span.ctxt())
431 None if is_glob && use_tree.span.rust_2015() => Some(use_tree.span.ctxt()),
435 Segment::from_ident(Ident::new(
437 use_tree.prefix.span.shrink_to_lo().with_ctxt(ctxt),
441 let prefix = crate_root.into_iter().chain(prefix_iter).collect::<Vec<_>>();
442 debug!("build_reduced_graph_for_use_tree: prefix={:?}", prefix);
444 let empty_for_self = |prefix: &[Segment]| {
445 prefix.is_empty() || prefix.len() == 1 && prefix[0].ident.name == kw::PathRoot
447 match use_tree.kind {
448 ast::UseTreeKind::Simple(rename) => {
449 let mut ident = use_tree.ident();
450 let mut module_path = prefix;
451 let mut source = module_path.pop().unwrap();
452 let mut type_ns_only = false;
454 self.r.visibilities.insert(self.r.local_def_id(id), vis);
457 // Correctly handle `self`
458 if source.ident.name == kw::SelfLower {
461 if empty_for_self(&module_path) {
464 ResolutionError::SelfImportOnlyInImportListWithNonEmptyPrefix,
469 // Replace `use foo::{ self };` with `use foo;`
470 let self_span = source.ident.span;
471 source = module_path.pop().unwrap();
472 if rename.is_none() {
473 // Keep the span of `self`, but the name of `foo`
474 ident = Ident { name: source.ident.name, span: self_span };
479 if source.ident.name == kw::SelfLower {
480 let parent = module_path.last();
482 let span = match parent {
483 // only `::self` from `use foo::self as bar`
484 Some(seg) => seg.ident.span.shrink_to_hi().to(source.ident.span),
485 None => source.ident.span,
487 let span_with_rename = match rename {
488 // only `self as bar` from `use foo::self as bar`
489 Some(rename) => source.ident.span.to(rename.span),
490 None => source.ident.span,
494 ResolutionError::SelfImportsOnlyAllowedWithin {
495 root: parent.is_none(),
500 // Error recovery: replace `use foo::self;` with `use foo;`
501 if let Some(parent) = module_path.pop() {
503 if rename.is_none() {
504 ident = source.ident;
509 // Disallow `use $crate;`
510 if source.ident.name == kw::DollarCrate && module_path.is_empty() {
511 let crate_root = self.r.resolve_crate_root(source.ident);
512 let crate_name = match crate_root.kind {
513 ModuleKind::Def(.., name) => name,
514 ModuleKind::Block => unreachable!(),
516 // HACK(eddyb) unclear how good this is, but keeping `$crate`
517 // in `source` breaks `src/test/ui/imports/import-crate-var.rs`,
518 // while the current crate doesn't have a valid `crate_name`.
519 if crate_name != kw::Empty {
520 // `crate_name` should not be interpreted as relative.
521 module_path.push(Segment::from_ident_and_id(
522 Ident { name: kw::PathRoot, span: source.ident.span },
523 self.r.next_node_id(),
525 source.ident.name = crate_name;
527 if rename.is_none() {
528 ident.name = crate_name;
533 .struct_span_err(item.span, "`$crate` may not be imported")
538 if ident.name == kw::Crate {
539 self.r.session.span_err(
541 "crate root imports need to be explicitly named: \
542 `use crate as name;`",
546 let kind = ImportKind::Single {
547 source: source.ident,
549 source_bindings: PerNS {
550 type_ns: Cell::new(Err(Determinacy::Undetermined)),
551 value_ns: Cell::new(Err(Determinacy::Undetermined)),
552 macro_ns: Cell::new(Err(Determinacy::Undetermined)),
554 target_bindings: PerNS {
555 type_ns: Cell::new(None),
556 value_ns: Cell::new(None),
557 macro_ns: Cell::new(None),
564 self.add_import(module_path, kind, use_tree.span, item, root_span, item.id, vis);
566 ast::UseTreeKind::Glob => {
567 let kind = ImportKind::Glob {
568 is_prelude: self.r.session.contains_name(&item.attrs, sym::prelude_import),
569 max_vis: Cell::new(None),
572 self.r.visibilities.insert(self.r.local_def_id(id), vis);
573 self.add_import(prefix, kind, use_tree.span, item, root_span, item.id, vis);
575 ast::UseTreeKind::Nested(ref items) => {
576 // Ensure there is at most one `self` in the list
577 let self_spans = items
579 .filter_map(|(use_tree, _)| {
580 if let ast::UseTreeKind::Simple(..) = use_tree.kind {
581 if use_tree.ident().name == kw::SelfLower {
582 return Some(use_tree.span);
588 .collect::<Vec<_>>();
589 if self_spans.len() > 1 {
590 let mut e = self.r.into_struct_error(
592 ResolutionError::SelfImportCanOnlyAppearOnceInTheList,
595 for other_span in self_spans.iter().skip(1) {
596 e.span_label(*other_span, "another `self` import appears here");
602 for &(ref tree, id) in items {
603 self.build_reduced_graph_for_use_tree(
604 // This particular use tree
605 tree, id, &prefix, true, // The whole `use` item
606 item, vis, root_span,
610 // Empty groups `a::b::{}` are turned into synthetic `self` imports
611 // `a::b::c::{self as _}`, so that their prefixes are correctly
612 // resolved and checked for privacy/stability/etc.
613 if items.is_empty() && !empty_for_self(&prefix) {
614 let new_span = prefix[prefix.len() - 1].ident.span;
615 let tree = ast::UseTree {
616 prefix: ast::Path::from_ident(Ident::new(kw::SelfLower, new_span)),
617 kind: ast::UseTreeKind::Simple(Some(Ident::new(kw::Underscore, new_span))),
620 self.build_reduced_graph_for_use_tree(
621 // This particular use tree
626 // The whole `use` item
628 ty::Visibility::Restricted(
629 self.parent_scope.module.nearest_parent_mod().expect_local(),
638 /// Constructs the reduced graph for one item.
639 fn build_reduced_graph_for_item(&mut self, item: &'b Item) {
640 let parent_scope = &self.parent_scope;
641 let parent = parent_scope.module;
642 let expansion = parent_scope.expansion;
643 let ident = item.ident;
645 let vis = self.resolve_visibility(&item.vis);
646 let local_def_id = self.r.local_def_id(item.id);
647 let def_id = local_def_id.to_def_id();
649 self.r.visibilities.insert(local_def_id, vis);
652 ItemKind::Use(ref use_tree) => {
653 self.build_reduced_graph_for_use_tree(
654 // This particular use tree
659 // The whole `use` item
666 ItemKind::ExternCrate(orig_name) => {
667 self.build_reduced_graph_for_extern_crate(
676 ItemKind::Mod(..) => {
677 let module = self.r.new_module(
679 ModuleKind::Def(DefKind::Mod, def_id, ident.name),
680 expansion.to_expn_id(),
682 parent.no_implicit_prelude
683 || self.r.session.contains_name(&item.attrs, sym::no_implicit_prelude),
685 self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
687 // Descend into the module.
688 self.parent_scope.module = module;
691 // These items live in the value namespace.
692 ItemKind::Static(_, mt, _) => {
693 let res = Res::Def(DefKind::Static(mt), def_id);
694 self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
696 ItemKind::Const(..) => {
697 let res = Res::Def(DefKind::Const, def_id);
698 self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
700 ItemKind::Fn(..) => {
701 let res = Res::Def(DefKind::Fn, def_id);
702 self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
704 // Functions introducing procedural macros reserve a slot
705 // in the macro namespace as well (see #52225).
706 self.define_macro(item);
709 // These items live in the type namespace.
710 ItemKind::TyAlias(..) => {
711 let res = Res::Def(DefKind::TyAlias, def_id);
712 self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
715 ItemKind::Enum(_, _) => {
716 let module = self.r.new_module(
718 ModuleKind::Def(DefKind::Enum, def_id, ident.name),
719 expansion.to_expn_id(),
721 parent.no_implicit_prelude,
723 self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
724 self.parent_scope.module = module;
727 ItemKind::TraitAlias(..) => {
728 let res = Res::Def(DefKind::TraitAlias, def_id);
729 self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
732 // These items live in both the type and value namespaces.
733 ItemKind::Struct(ref vdata, _) => {
734 // Define a name in the type namespace.
735 let res = Res::Def(DefKind::Struct, def_id);
736 self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
738 // Record field names for error reporting.
739 self.insert_field_names_local(def_id, vdata);
741 // If this is a tuple or unit struct, define a name
742 // in the value namespace as well.
743 if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(vdata) {
744 // If the structure is marked as non_exhaustive then lower the visibility
745 // to within the crate.
746 let mut ctor_vis = if vis.is_public()
747 && self.r.session.contains_name(&item.attrs, sym::non_exhaustive)
749 ty::Visibility::Restricted(CRATE_DEF_ID)
754 let mut ret_fields = Vec::with_capacity(vdata.fields().len());
756 for field in vdata.fields() {
757 // NOTE: The field may be an expansion placeholder, but expansion sets
758 // correct visibilities for unnamed field placeholders specifically, so the
759 // constructor visibility should still be determined correctly.
761 .try_resolve_visibility(&field.vis, false)
762 .unwrap_or(ty::Visibility::Public);
763 if ctor_vis.is_at_least(field_vis, &*self.r) {
764 ctor_vis = field_vis;
766 ret_fields.push(field_vis.to_def_id());
768 let ctor_def_id = self.r.local_def_id(ctor_node_id);
770 Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id.to_def_id());
771 self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, sp, expansion));
772 self.r.visibilities.insert(ctor_def_id, ctor_vis);
776 .insert(def_id, (ctor_res, ctor_vis.to_def_id(), ret_fields));
780 ItemKind::Union(ref vdata, _) => {
781 let res = Res::Def(DefKind::Union, def_id);
782 self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
784 // Record field names for error reporting.
785 self.insert_field_names_local(def_id, vdata);
788 ItemKind::Trait(..) => {
789 // Add all the items within to a new module.
790 let module = self.r.new_module(
792 ModuleKind::Def(DefKind::Trait, def_id, ident.name),
793 expansion.to_expn_id(),
795 parent.no_implicit_prelude,
797 self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
798 self.parent_scope.module = module;
801 // These items do not add names to modules.
802 ItemKind::Impl(box Impl { of_trait: Some(..), .. }) => {
803 self.r.trait_impl_items.insert(local_def_id);
805 ItemKind::Impl { .. } | ItemKind::ForeignMod(..) | ItemKind::GlobalAsm(..) => {}
807 ItemKind::MacroDef(..) | ItemKind::MacCall(_) => unreachable!(),
811 fn build_reduced_graph_for_extern_crate(
813 orig_name: Option<Symbol>,
815 local_def_id: LocalDefId,
819 let ident = item.ident;
821 let parent_scope = self.parent_scope;
822 let expansion = parent_scope.expansion;
824 let (used, module, binding) = if orig_name.is_none() && ident.name == kw::SelfLower {
827 .struct_span_err(item.span, "`extern crate self;` requires renaming")
830 "rename the `self` crate to be able to import it",
831 "extern crate self as name;",
832 Applicability::HasPlaceholders,
836 } else if orig_name == Some(kw::SelfLower) {
837 Some(self.r.graph_root)
839 let crate_id = self.r.crate_loader().process_extern_crate(item, local_def_id);
840 crate_id.map(|crate_id| {
841 self.r.extern_crate_map.insert(local_def_id, crate_id);
842 self.r.expect_module(crate_id.as_def_id())
846 let used = self.process_macro_use_imports(item, module);
847 let vis = ty::Visibility::<LocalDefId>::Public;
848 let binding = (module, vis, sp, expansion).to_name_binding(self.r.arenas);
849 (used, Some(ModuleOrUniformRoot::Module(module)), binding)
851 .unwrap_or((true, None, self.r.dummy_binding));
852 let import = self.r.arenas.alloc_import(Import {
853 kind: ImportKind::ExternCrate { source: orig_name, target: ident, id: item.id },
855 parent_scope: self.parent_scope,
856 imported_module: Cell::new(module),
857 has_attributes: !item.attrs.is_empty(),
858 use_span_with_attributes: item.span_with_attributes(),
860 root_span: item.span,
862 module_path: Vec::new(),
863 vis: Cell::new(Some(vis)),
864 used: Cell::new(used),
866 self.r.potentially_unused_imports.push(import);
867 let imported_binding = self.r.import(binding, import);
868 if ptr::eq(parent, self.r.graph_root) {
869 if let Some(entry) = self.r.extern_prelude.get(&ident.normalize_to_macros_2_0()) {
870 if expansion != LocalExpnId::ROOT
871 && orig_name.is_some()
872 && entry.extern_crate_item.is_none()
874 let msg = "macro-expanded `extern crate` items cannot \
875 shadow names passed with `--extern`";
876 self.r.session.span_err(item.span, msg);
879 let entry = self.r.extern_prelude.entry(ident.normalize_to_macros_2_0()).or_insert(
880 ExternPreludeEntry { extern_crate_item: None, introduced_by_item: true },
882 entry.extern_crate_item = Some(imported_binding);
883 if orig_name.is_some() {
884 entry.introduced_by_item = true;
887 self.r.define(parent, ident, TypeNS, imported_binding);
890 /// Constructs the reduced graph for one foreign item.
891 fn build_reduced_graph_for_foreign_item(&mut self, item: &ForeignItem) {
892 let local_def_id = self.r.local_def_id(item.id);
893 let def_id = local_def_id.to_def_id();
894 let (def_kind, ns) = match item.kind {
895 ForeignItemKind::Fn(..) => (DefKind::Fn, ValueNS),
896 ForeignItemKind::Static(_, mt, _) => (DefKind::Static(mt), ValueNS),
897 ForeignItemKind::TyAlias(..) => (DefKind::ForeignTy, TypeNS),
898 ForeignItemKind::MacCall(_) => unreachable!(),
900 let parent = self.parent_scope.module;
901 let expansion = self.parent_scope.expansion;
902 let vis = self.resolve_visibility(&item.vis);
903 let res = Res::Def(def_kind, def_id);
904 self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion));
905 self.r.visibilities.insert(local_def_id, vis);
908 fn build_reduced_graph_for_block(&mut self, block: &Block) {
909 let parent = self.parent_scope.module;
910 let expansion = self.parent_scope.expansion;
911 if self.block_needs_anonymous_module(block) {
912 let module = self.r.new_module(
915 expansion.to_expn_id(),
917 parent.no_implicit_prelude,
919 self.r.block_map.insert(block.id, module);
920 self.parent_scope.module = module; // Descend into the block.
924 /// Builds the reduced graph for a single item in an external crate.
925 fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) {
926 let parent = self.parent_scope.module;
927 let ModChild { ident, res, vis, span, macro_rules } = child;
928 let res = res.expect_non_local();
929 let expansion = self.parent_scope.expansion;
930 // Record primary definitions.
932 Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, def_id) => {
933 let module = self.r.expect_module(def_id);
934 self.r.define(parent, ident, TypeNS, (module, vis, span, expansion));
943 | DefKind::ImplTraitPlaceholder
944 | DefKind::TraitAlias
949 | Res::ToolMod => self.r.define(parent, ident, TypeNS, (res, vis, span, expansion)),
955 | DefKind::AssocConst
958 ) => self.r.define(parent, ident, ValueNS, (res, vis, span, expansion)),
959 Res::Def(DefKind::Macro(..), _) | Res::NonMacroAttr(..) => {
961 self.r.define(parent, ident, MacroNS, (res, vis, span, expansion))
966 | DefKind::ConstParam
967 | DefKind::ExternCrate
969 | DefKind::ForeignMod
971 | DefKind::InlineConst
973 | DefKind::LifetimeParam
977 | DefKind::Generator,
981 | Res::SelfTyParam { .. }
982 | Res::SelfTyAlias { .. }
984 | Res::Err => bug!("unexpected resolution: {:?}", res),
986 // Record some extra data for better diagnostics.
987 let cstore = self.r.cstore();
989 Res::Def(DefKind::Struct, def_id) => {
990 if let Some((ctor_kind, ctor_def_id)) = cstore.ctor_untracked(def_id) {
991 let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);
992 let ctor_vis = cstore.visibility_untracked(ctor_def_id);
993 let field_visibilities =
994 cstore.struct_field_visibilities_untracked(def_id).collect();
997 .insert(def_id, (ctor_res, ctor_vis, field_visibilities));
999 self.insert_field_names_extern(def_id)
1001 Res::Def(DefKind::Union, def_id) => self.insert_field_names_extern(def_id),
1002 Res::Def(DefKind::AssocFn, def_id) => {
1003 if cstore.fn_has_self_parameter_untracked(def_id, self.r.session) {
1004 self.r.has_self.insert(def_id);
1011 fn add_macro_use_binding(
1014 binding: &'a NameBinding<'a>,
1016 allow_shadowing: bool,
1018 if self.r.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing {
1019 let msg = format!("`{}` is already in scope", name);
1021 "macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)";
1022 self.r.session.struct_span_err(span, &msg).note(note).emit();
1026 /// Returns `true` if we should consider the underlying `extern crate` to be used.
1027 fn process_macro_use_imports(&mut self, item: &Item, module: Module<'a>) -> bool {
1028 let mut import_all = None;
1029 let mut single_imports = Vec::new();
1030 for attr in &item.attrs {
1031 if attr.has_name(sym::macro_use) {
1032 if self.parent_scope.module.parent.is_some() {
1037 "an `extern crate` loading macros must be at the crate root"
1041 if let ItemKind::ExternCrate(Some(orig_name)) = item.kind {
1042 if orig_name == kw::SelfLower {
1047 "`#[macro_use]` is not supported on `extern crate self`",
1052 let ill_formed = |span| {
1053 struct_span_err!(self.r.session, span, E0466, "bad macro import").emit();
1056 Some(meta) => match meta.kind {
1057 MetaItemKind::Word => {
1058 import_all = Some(meta.span);
1061 MetaItemKind::List(nested_metas) => {
1062 for nested_meta in nested_metas {
1063 match nested_meta.ident() {
1064 Some(ident) if nested_meta.is_word() => {
1065 single_imports.push(ident)
1067 _ => ill_formed(nested_meta.span()),
1071 MetaItemKind::NameValue(..) => ill_formed(meta.span),
1073 None => ill_formed(attr.span),
1078 let macro_use_import = |this: &Self, span| {
1079 this.r.arenas.alloc_import(Import {
1080 kind: ImportKind::MacroUse,
1082 parent_scope: this.parent_scope,
1083 imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))),
1084 use_span_with_attributes: item.span_with_attributes(),
1085 has_attributes: !item.attrs.is_empty(),
1086 use_span: item.span,
1089 module_path: Vec::new(),
1090 vis: Cell::new(Some(ty::Visibility::Restricted(CRATE_DEF_ID))),
1091 used: Cell::new(false),
1095 let allow_shadowing = self.parent_scope.expansion == LocalExpnId::ROOT;
1096 if let Some(span) = import_all {
1097 let import = macro_use_import(self, span);
1098 self.r.potentially_unused_imports.push(import);
1099 module.for_each_child(self, |this, ident, ns, binding| {
1101 let imported_binding = this.r.import(binding, import);
1102 this.add_macro_use_binding(ident.name, imported_binding, span, allow_shadowing);
1106 for ident in single_imports.iter().cloned() {
1107 let result = self.r.maybe_resolve_ident_in_module(
1108 ModuleOrUniformRoot::Module(module),
1113 if let Ok(binding) = result {
1114 let import = macro_use_import(self, ident.span);
1115 self.r.potentially_unused_imports.push(import);
1116 let imported_binding = self.r.import(binding, import);
1117 self.add_macro_use_binding(
1124 struct_span_err!(self.r.session, ident.span, E0469, "imported macro not found")
1129 import_all.is_some() || !single_imports.is_empty()
1132 /// Returns `true` if this attribute list contains `macro_use`.
1133 fn contains_macro_use(&mut self, attrs: &[ast::Attribute]) -> bool {
1135 if attr.has_name(sym::macro_escape) {
1136 let msg = "`#[macro_escape]` is a deprecated synonym for `#[macro_use]`";
1137 let mut err = self.r.session.struct_span_warn(attr.span, msg);
1138 if let ast::AttrStyle::Inner = attr.style {
1139 err.help("try an outer attribute: `#[macro_use]`").emit();
1143 } else if !attr.has_name(sym::macro_use) {
1147 if !attr.is_word() {
1148 self.r.session.span_err(attr.span, "arguments to `macro_use` are not allowed here");
1156 fn visit_invoc(&mut self, id: NodeId) -> LocalExpnId {
1157 let invoc_id = id.placeholder_to_expn_id();
1158 let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope);
1159 assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation");
1163 /// Visit invocation in context in which it can emit a named item (possibly `macro_rules`)
1164 /// directly into its parent scope's module.
1165 fn visit_invoc_in_module(&mut self, id: NodeId) -> MacroRulesScopeRef<'a> {
1166 let invoc_id = self.visit_invoc(id);
1167 self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id);
1168 self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Invocation(invoc_id))
1171 fn proc_macro_stub(&self, item: &ast::Item) -> Option<(MacroKind, Ident, Span)> {
1172 if self.r.session.contains_name(&item.attrs, sym::proc_macro) {
1173 return Some((MacroKind::Bang, item.ident, item.span));
1174 } else if self.r.session.contains_name(&item.attrs, sym::proc_macro_attribute) {
1175 return Some((MacroKind::Attr, item.ident, item.span));
1176 } else if let Some(attr) = self.r.session.find_by_name(&item.attrs, sym::proc_macro_derive)
1178 if let Some(nested_meta) = attr.meta_item_list().and_then(|list| list.get(0).cloned()) {
1179 if let Some(ident) = nested_meta.ident() {
1180 return Some((MacroKind::Derive, ident, ident.span));
1187 // Mark the given macro as unused unless its name starts with `_`.
1188 // Macro uses will remove items from this set, and the remaining
1189 // items will be reported as `unused_macros`.
1190 fn insert_unused_macro(
1195 rule_spans: &[(usize, Span)],
1197 if !ident.as_str().starts_with('_') {
1198 self.r.unused_macros.insert(def_id, (node_id, ident));
1199 for (rule_i, rule_span) in rule_spans.iter() {
1200 self.r.unused_macro_rules.insert((def_id, *rule_i), (ident, *rule_span));
1205 fn define_macro(&mut self, item: &ast::Item) -> MacroRulesScopeRef<'a> {
1206 let parent_scope = self.parent_scope;
1207 let expansion = parent_scope.expansion;
1208 let def_id = self.r.local_def_id(item.id);
1209 let (ext, ident, span, macro_rules, rule_spans) = match &item.kind {
1210 ItemKind::MacroDef(def) => {
1211 let (ext, rule_spans) = self.r.compile_macro(item, self.r.session.edition());
1212 let ext = Lrc::new(ext);
1213 (ext, item.ident, item.span, def.macro_rules, rule_spans)
1215 ItemKind::Fn(..) => match self.proc_macro_stub(item) {
1216 Some((macro_kind, ident, span)) => {
1217 self.r.proc_macro_stubs.insert(def_id);
1218 (self.r.dummy_ext(macro_kind), ident, span, false, Vec::new())
1220 None => return parent_scope.macro_rules,
1222 _ => unreachable!(),
1225 let res = Res::Def(DefKind::Macro(ext.macro_kind()), def_id.to_def_id());
1226 self.r.macro_map.insert(def_id.to_def_id(), MacroData { ext, macro_rules });
1227 self.r.local_macro_def_scopes.insert(def_id, parent_scope.module);
1230 let ident = ident.normalize_to_macros_2_0();
1231 self.r.macro_names.insert(ident);
1232 let is_macro_export = self.r.session.contains_name(&item.attrs, sym::macro_export);
1233 let vis = if is_macro_export {
1234 ty::Visibility::Public
1236 ty::Visibility::Restricted(CRATE_DEF_ID)
1238 let binding = (res, vis, span, expansion).to_name_binding(self.r.arenas);
1239 self.r.set_binding_parent_module(binding, parent_scope.module);
1240 if is_macro_export {
1241 let import = self.r.arenas.alloc_import(Import {
1242 kind: ImportKind::MacroExport,
1244 parent_scope: self.parent_scope,
1245 imported_module: Cell::new(None),
1246 has_attributes: false,
1247 use_span_with_attributes: span,
1251 module_path: Vec::new(),
1252 vis: Cell::new(Some(vis)),
1253 used: Cell::new(true),
1255 let import_binding = self.r.import(binding, import);
1256 self.r.define(self.r.graph_root, ident, MacroNS, import_binding);
1258 self.r.check_reserved_macro_name(ident, res);
1259 self.insert_unused_macro(ident, def_id, item.id, &rule_spans);
1261 self.r.visibilities.insert(def_id, vis);
1262 let scope = self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Binding(
1263 self.r.arenas.alloc_macro_rules_binding(MacroRulesBinding {
1264 parent_macro_rules_scope: parent_scope.macro_rules,
1269 self.r.macro_rules_scopes.insert(def_id, scope);
1272 let module = parent_scope.module;
1273 let vis = match item.kind {
1274 // Visibilities must not be resolved non-speculatively twice
1275 // and we already resolved this one as a `fn` item visibility.
1276 ItemKind::Fn(..) => {
1277 self.try_resolve_visibility(&item.vis, false).unwrap_or(ty::Visibility::Public)
1279 _ => self.resolve_visibility(&item.vis),
1281 if !vis.is_public() {
1282 self.insert_unused_macro(ident, def_id, item.id, &rule_spans);
1284 self.r.define(module, ident, MacroNS, (res, vis, span, expansion));
1285 self.r.visibilities.insert(def_id, vis);
1286 self.parent_scope.macro_rules
1291 macro_rules! method {
1292 ($visit:ident: $ty:ty, $invoc:path, $walk:ident) => {
1293 fn $visit(&mut self, node: &'b $ty) {
1294 if let $invoc(..) = node.kind {
1295 self.visit_invoc(node.id);
1297 visit::$walk(self, node);
1303 impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> {
1304 method!(visit_expr: ast::Expr, ast::ExprKind::MacCall, walk_expr);
1305 method!(visit_pat: ast::Pat, ast::PatKind::MacCall, walk_pat);
1306 method!(visit_ty: ast::Ty, ast::TyKind::MacCall, walk_ty);
1308 fn visit_item(&mut self, item: &'b Item) {
1309 let orig_module_scope = self.parent_scope.module;
1310 self.parent_scope.macro_rules = match item.kind {
1311 ItemKind::MacroDef(..) => {
1312 let macro_rules_scope = self.define_macro(item);
1313 visit::walk_item(self, item);
1316 ItemKind::MacCall(..) => {
1317 let macro_rules_scope = self.visit_invoc_in_module(item.id);
1318 visit::walk_item(self, item);
1322 let orig_macro_rules_scope = self.parent_scope.macro_rules;
1323 self.build_reduced_graph_for_item(item);
1324 visit::walk_item(self, item);
1326 ItemKind::Mod(..) if self.contains_macro_use(&item.attrs) => {
1327 self.parent_scope.macro_rules
1329 _ => orig_macro_rules_scope,
1333 self.parent_scope.module = orig_module_scope;
1336 fn visit_stmt(&mut self, stmt: &'b ast::Stmt) {
1337 if let ast::StmtKind::MacCall(..) = stmt.kind {
1338 self.parent_scope.macro_rules = self.visit_invoc_in_module(stmt.id);
1340 visit::walk_stmt(self, stmt);
1344 fn visit_foreign_item(&mut self, foreign_item: &'b ForeignItem) {
1345 if let ForeignItemKind::MacCall(_) = foreign_item.kind {
1346 self.visit_invoc_in_module(foreign_item.id);
1350 self.build_reduced_graph_for_foreign_item(foreign_item);
1351 visit::walk_foreign_item(self, foreign_item);
1354 fn visit_block(&mut self, block: &'b Block) {
1355 let orig_current_module = self.parent_scope.module;
1356 let orig_current_macro_rules_scope = self.parent_scope.macro_rules;
1357 self.build_reduced_graph_for_block(block);
1358 visit::walk_block(self, block);
1359 self.parent_scope.module = orig_current_module;
1360 self.parent_scope.macro_rules = orig_current_macro_rules_scope;
1363 fn visit_assoc_item(&mut self, item: &'b AssocItem, ctxt: AssocCtxt) {
1364 if let AssocItemKind::MacCall(_) = item.kind {
1366 AssocCtxt::Trait => {
1367 self.visit_invoc_in_module(item.id);
1369 AssocCtxt::Impl => {
1370 self.visit_invoc(item.id);
1376 let vis = self.resolve_visibility(&item.vis);
1377 let local_def_id = self.r.local_def_id(item.id);
1378 let def_id = local_def_id.to_def_id();
1380 if !(ctxt == AssocCtxt::Impl
1381 && matches!(item.vis.kind, ast::VisibilityKind::Inherited)
1385 .contains(&ty::DefIdTree::local_parent(&*self.r, local_def_id)))
1387 // Trait impl item visibility is inherited from its trait when not specified
1388 // explicitly. In that case we cannot determine it here in early resolve,
1389 // so we leave a hole in the visibility table to be filled later.
1390 self.r.visibilities.insert(local_def_id, vis);
1393 if ctxt == AssocCtxt::Trait {
1394 let (def_kind, ns) = match item.kind {
1395 AssocItemKind::Const(..) => (DefKind::AssocConst, ValueNS),
1396 AssocItemKind::Fn(box Fn { ref sig, .. }) => {
1397 if sig.decl.has_self() {
1398 self.r.has_self.insert(def_id);
1400 (DefKind::AssocFn, ValueNS)
1402 AssocItemKind::Type(..) => (DefKind::AssocTy, TypeNS),
1403 AssocItemKind::MacCall(_) => bug!(), // handled above
1406 let parent = self.parent_scope.module;
1407 let expansion = self.parent_scope.expansion;
1408 let res = Res::Def(def_kind, def_id);
1409 self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion));
1412 visit::walk_assoc_item(self, item, ctxt);
1415 fn visit_attribute(&mut self, attr: &'b ast::Attribute) {
1416 if !attr.is_doc_comment() && attr::is_builtin_attr(attr) {
1419 .push((attr.get_normal_item().path.segments[0].ident, self.parent_scope));
1421 visit::walk_attribute(self, attr);
1424 fn visit_arm(&mut self, arm: &'b ast::Arm) {
1425 if arm.is_placeholder {
1426 self.visit_invoc(arm.id);
1428 visit::walk_arm(self, arm);
1432 fn visit_expr_field(&mut self, f: &'b ast::ExprField) {
1433 if f.is_placeholder {
1434 self.visit_invoc(f.id);
1436 visit::walk_expr_field(self, f);
1440 fn visit_pat_field(&mut self, fp: &'b ast::PatField) {
1441 if fp.is_placeholder {
1442 self.visit_invoc(fp.id);
1444 visit::walk_pat_field(self, fp);
1448 fn visit_generic_param(&mut self, param: &'b ast::GenericParam) {
1449 if param.is_placeholder {
1450 self.visit_invoc(param.id);
1452 visit::walk_generic_param(self, param);
1456 fn visit_param(&mut self, p: &'b ast::Param) {
1457 if p.is_placeholder {
1458 self.visit_invoc(p.id);
1460 visit::walk_param(self, p);
1464 fn visit_field_def(&mut self, sf: &'b ast::FieldDef) {
1465 if sf.is_placeholder {
1466 self.visit_invoc(sf.id);
1468 let vis = self.resolve_visibility(&sf.vis);
1469 self.r.visibilities.insert(self.r.local_def_id(sf.id), vis);
1470 visit::walk_field_def(self, sf);
1474 // Constructs the reduced graph for one variant. Variants exist in the
1475 // type and value namespaces.
1476 fn visit_variant(&mut self, variant: &'b ast::Variant) {
1477 if variant.is_placeholder {
1478 self.visit_invoc_in_module(variant.id);
1482 let parent = self.parent_scope.module;
1483 let expn_id = self.parent_scope.expansion;
1484 let ident = variant.ident;
1486 // Define a name in the type namespace.
1487 let def_id = self.r.local_def_id(variant.id);
1488 let res = Res::Def(DefKind::Variant, def_id.to_def_id());
1489 let vis = self.resolve_visibility(&variant.vis);
1490 self.r.define(parent, ident, TypeNS, (res, vis, variant.span, expn_id));
1491 self.r.visibilities.insert(def_id, vis);
1493 // If the variant is marked as non_exhaustive then lower the visibility to within the crate.
1494 let ctor_vis = if vis.is_public()
1495 && self.r.session.contains_name(&variant.attrs, sym::non_exhaustive)
1497 ty::Visibility::Restricted(CRATE_DEF_ID)
1502 // Define a constructor name in the value namespace.
1503 if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(&variant.data) {
1504 let ctor_def_id = self.r.local_def_id(ctor_node_id);
1506 Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id.to_def_id());
1507 self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, variant.span, expn_id));
1508 self.r.visibilities.insert(ctor_def_id, ctor_vis);
1511 // Record field names for error reporting.
1512 self.insert_field_names_local(def_id.to_def_id(), &variant.data);
1514 visit::walk_variant(self, variant);
1517 fn visit_crate(&mut self, krate: &'b ast::Crate) {
1518 if krate.is_placeholder {
1519 self.visit_invoc_in_module(krate.id);
1521 visit::walk_crate(self, krate);
1522 self.contains_macro_use(&krate.attrs);