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};
13 use crate::{NameBinding, NameBindingKind, ParentScope, PathResult, PerNS, ResolutionError};
14 use crate::{Resolver, ResolverArenas, Segment, ToNameBinding, VisResolutionError};
16 use rustc_ast::visit::{self, AssocCtxt, Visitor};
17 use rustc_ast::{self as ast, AssocItem, AssocItemKind, MetaItemKind, StmtKind};
18 use rustc_ast::{Block, Fn, ForeignItem, ForeignItemKind, Impl, Item, ItemKind, NodeId};
19 use rustc_ast_lowering::ResolverAstLowering;
20 use rustc_attr as attr;
21 use rustc_data_structures::sync::Lrc;
22 use rustc_errors::{struct_span_err, Applicability};
23 use rustc_expand::base::SyntaxExtension;
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;
31 use rustc_session::cstore::CrateStore;
32 use rustc_span::hygiene::{ExpnId, LocalExpnId, MacroKind};
33 use rustc_span::source_map::{respan, Spanned};
34 use rustc_span::symbol::{kw, sym, Ident, Symbol};
41 type Res = def::Res<NodeId>;
43 impl<'a> ToNameBinding<'a> for (Module<'a>, ty::Visibility, Span, LocalExpnId) {
44 fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
45 arenas.alloc_name_binding(NameBinding {
46 kind: NameBindingKind::Module(self.0),
55 impl<'a> ToNameBinding<'a> for (Res, ty::Visibility, Span, LocalExpnId) {
56 fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
57 arenas.alloc_name_binding(NameBinding {
58 kind: NameBindingKind::Res(self.0, false),
69 impl<'a> ToNameBinding<'a> for (Res, ty::Visibility, Span, LocalExpnId, IsMacroExport) {
70 fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> {
71 arenas.alloc_name_binding(NameBinding {
72 kind: NameBindingKind::Res(self.0, true),
81 impl<'a> Resolver<'a> {
82 /// Defines `name` in namespace `ns` of module `parent` to be `def` if it is not yet defined;
83 /// otherwise, reports an error.
84 crate fn define<T>(&mut self, parent: Module<'a>, ident: Ident, ns: Namespace, def: T)
88 let binding = def.to_name_binding(self.arenas);
89 let key = self.new_key(ident, ns);
90 if let Err(old_binding) = self.try_define(parent, key, binding) {
91 self.report_conflict(parent, ident, ns, old_binding, &binding);
95 /// Walks up the tree of definitions starting at `def_id`,
96 /// stopping at the first encountered module.
97 /// Parent block modules for arbitrary def-ids are not recorded for the local crate,
98 /// and are not preserved in metadata for foreign crates, so block modules are never
99 /// returned by this function.
101 /// For the local crate ignoring block modules may be incorrect, so use this method with care.
103 /// For foreign crates block modules can be ignored without introducing observable differences,
104 /// moreover they has to be ignored right now because they are not kept in metadata.
105 /// Foreign parent modules are used for resolving names used by foreign macros with def-site
106 /// hygiene, therefore block module ignorability relies on macros with def-site hygiene and
107 /// block module parents being unreachable from other crates.
108 /// Reachable macros with block module parents exist due to `#[macro_export] macro_rules!`,
109 /// but they cannot use def-site hygiene, so the assumption holds
110 /// (<https://github.com/rust-lang/rust/pull/77984#issuecomment-712445508>).
111 pub fn get_nearest_non_block_module(&mut self, mut def_id: DefId) -> Module<'a> {
113 match self.get_module(def_id) {
114 Some(module) => return module,
117 self.def_key(def_id).parent.expect("non-root `DefId` without parent")
123 pub fn expect_module(&mut self, def_id: DefId) -> Module<'a> {
124 self.get_module(def_id).expect("argument `DefId` is not a module")
127 /// If `def_id` refers to a module (in resolver's sense, i.e. a module item, crate root, enum,
128 /// or trait), then this function returns that module's resolver representation, otherwise it
130 crate fn get_module(&mut self, def_id: DefId) -> Option<Module<'a>> {
131 if let module @ Some(..) = self.module_map.get(&def_id) {
132 return module.copied();
135 if !def_id.is_local() {
136 let def_kind = self.cstore().def_kind(def_id);
138 DefKind::Mod | DefKind::Enum | DefKind::Trait => {
139 let def_key = self.cstore().def_key(def_id);
140 let parent = def_key.parent.map(|index| {
141 self.get_nearest_non_block_module(DefId { index, krate: def_id.krate })
143 let name = if let Some(cnum) = def_id.as_crate_root() {
144 self.cstore().crate_name(cnum)
146 def_key.disambiguated_data.data.get_opt_name().expect("module without name")
149 Some(self.new_module(
151 ModuleKind::Def(def_kind, def_id, name),
152 self.cstore().module_expansion_untracked(def_id, &self.session),
153 self.cstore().get_span_untracked(def_id, &self.session),
154 // FIXME: Account for `#[no_implicit_prelude]` attributes.
155 parent.map_or(false, |module| module.no_implicit_prelude),
165 crate fn expn_def_scope(&mut self, expn_id: ExpnId) -> Module<'a> {
166 match expn_id.expn_data().macro_def_id {
167 Some(def_id) => self.macro_def_scope(def_id),
170 .and_then(|expn_id| self.ast_transform_scopes.get(&expn_id))
171 .unwrap_or(&self.graph_root),
175 crate fn macro_def_scope(&mut self, def_id: DefId) -> Module<'a> {
176 if let Some(id) = def_id.as_local() {
177 self.local_macro_def_scopes[&id]
179 self.get_nearest_non_block_module(def_id)
183 crate fn get_macro(&mut self, res: Res) -> Option<Lrc<SyntaxExtension>> {
185 Res::Def(DefKind::Macro(..), def_id) => Some(self.get_macro_by_def_id(def_id)),
186 Res::NonMacroAttr(_) => Some(self.non_macro_attr.clone()),
191 crate fn get_macro_by_def_id(&mut self, def_id: DefId) -> Lrc<SyntaxExtension> {
192 if let Some(ext) = self.macro_map.get(&def_id) {
196 let ext = Lrc::new(match self.cstore().load_macro_untracked(def_id, &self.session) {
197 LoadedMacro::MacroDef(item, edition) => self.compile_macro(&item, edition),
198 LoadedMacro::ProcMacro(ext) => ext,
201 self.macro_map.insert(def_id, ext.clone());
205 crate fn build_reduced_graph(
207 fragment: &AstFragment,
208 parent_scope: ParentScope<'a>,
209 ) -> MacroRulesScopeRef<'a> {
210 collect_definitions(self, fragment, parent_scope.expansion);
211 let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope };
212 fragment.visit_with(&mut visitor);
213 visitor.parent_scope.macro_rules
216 crate fn build_reduced_graph_external(&mut self, module: Module<'a>) {
217 for child in self.cstore().module_children_untracked(module.def_id(), self.session) {
218 let parent_scope = ParentScope::module(module, self);
219 BuildReducedGraphVisitor { r: self, parent_scope }
220 .build_reduced_graph_for_external_crate_res(child);
225 struct BuildReducedGraphVisitor<'a, 'b> {
226 r: &'b mut Resolver<'a>,
227 parent_scope: ParentScope<'a>,
230 impl<'a> AsMut<Resolver<'a>> for BuildReducedGraphVisitor<'a, '_> {
231 fn as_mut(&mut self) -> &mut Resolver<'a> {
236 impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
237 fn resolve_visibility(&mut self, vis: &ast::Visibility) -> ty::Visibility {
238 self.try_resolve_visibility(vis, true).unwrap_or_else(|err| {
239 self.r.report_vis_error(err);
240 ty::Visibility::Public
244 fn try_resolve_visibility<'ast>(
246 vis: &'ast ast::Visibility,
248 ) -> Result<ty::Visibility, VisResolutionError<'ast>> {
249 let parent_scope = &self.parent_scope;
251 ast::VisibilityKind::Public => Ok(ty::Visibility::Public),
252 ast::VisibilityKind::Crate(..) => {
253 Ok(ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id()))
255 ast::VisibilityKind::Inherited => {
256 Ok(match self.parent_scope.module.kind {
257 // Any inherited visibility resolved directly inside an enum or trait
258 // (i.e. variants, fields, and trait items) inherits from the visibility
259 // of the enum or trait.
260 ModuleKind::Def(DefKind::Enum | DefKind::Trait, def_id, _) => {
261 self.r.visibilities[&def_id.expect_local()]
263 // Otherwise, the visibility is restricted to the nearest parent `mod` item.
264 _ => ty::Visibility::Restricted(self.parent_scope.module.nearest_parent_mod()),
267 ast::VisibilityKind::Restricted { ref path, id, .. } => {
268 // Make `PRIVATE_IN_PUBLIC` lint a hard error.
269 self.r.has_pub_restricted = true;
270 // For visibilities we are not ready to provide correct implementation of "uniform
271 // paths" right now, so on 2018 edition we only allow module-relative paths for now.
272 // On 2015 edition visibilities are resolved as crate-relative by default,
273 // so we are prepending a root segment if necessary.
274 let ident = path.segments.get(0).expect("empty path in visibility").ident;
275 let crate_root = if ident.is_path_segment_keyword() {
277 } else if ident.span.rust_2015() {
278 Some(Segment::from_ident(Ident::new(
280 path.span.shrink_to_lo().with_ctxt(ident.span.ctxt()),
283 return Err(VisResolutionError::Relative2018(ident.span, path));
286 let segments = crate_root
288 .chain(path.segments.iter().map(|seg| seg.into()))
289 .collect::<Vec<_>>();
290 let expected_found_error = |res| {
291 Err(VisResolutionError::ExpectedFound(
293 Segment::names_to_string(&segments),
297 match self.r.resolve_path(
301 if finalize { Finalize::SimplePath(id, path.span) } else { Finalize::No },
304 PathResult::Module(ModuleOrUniformRoot::Module(module)) => {
305 let res = module.res().expect("visibility resolved to unnamed block");
307 self.r.record_partial_res(id, PartialRes::new(res));
309 if module.is_normal() {
311 Ok(ty::Visibility::Public)
313 let vis = ty::Visibility::Restricted(res.def_id());
314 if self.r.is_accessible_from(vis, parent_scope.module) {
317 Err(VisResolutionError::AncestorOnly(path.span))
321 expected_found_error(res)
324 PathResult::Module(..) => Err(VisResolutionError::ModuleOnly(path.span)),
325 PathResult::NonModule(partial_res) => {
326 expected_found_error(partial_res.base_res())
328 PathResult::Failed { span, label, suggestion, .. } => {
329 Err(VisResolutionError::FailedToResolve(span, label, suggestion))
331 PathResult::Indeterminate => Err(VisResolutionError::Indeterminate(path.span)),
337 fn insert_field_names_local(&mut self, def_id: DefId, vdata: &ast::VariantData) {
338 let field_names = vdata
341 .map(|field| respan(field.span, field.ident.map_or(kw::Empty, |ident| ident.name)))
343 self.insert_field_names(def_id, field_names);
346 fn insert_field_names(&mut self, def_id: DefId, field_names: Vec<Spanned<Symbol>>) {
347 self.r.field_names.insert(def_id, field_names);
350 fn block_needs_anonymous_module(&mut self, block: &Block) -> bool {
351 // If any statements are items, we need to create an anonymous module
355 .any(|statement| matches!(statement.kind, StmtKind::Item(_) | StmtKind::MacCall(_)))
358 // Add an import to the current module.
361 module_path: Vec<Segment>,
362 kind: ImportKind<'a>,
370 let current_module = self.parent_scope.module;
371 let import = self.r.arenas.alloc_import(Import {
373 parent_scope: self.parent_scope,
375 imported_module: Cell::new(None),
379 use_span_with_attributes: item.span_with_attributes(),
380 has_attributes: !item.attrs.is_empty(),
384 used: Cell::new(false),
387 self.r.indeterminate_imports.push(import);
389 // Don't add unresolved underscore imports to modules
390 ImportKind::Single { target: Ident { name: kw::Underscore, .. }, .. } => {}
391 ImportKind::Single { target, type_ns_only, .. } => {
392 self.r.per_ns(|this, ns| {
393 if !type_ns_only || ns == TypeNS {
394 let key = this.new_key(target, ns);
395 let mut resolution = this.resolution(current_module, key).borrow_mut();
396 resolution.add_single_import(import);
400 // We don't add prelude imports to the globs since they only affect lexical scopes,
401 // which are not relevant to import resolution.
402 ImportKind::Glob { is_prelude: true, .. } => {}
403 ImportKind::Glob { .. } => current_module.globs.borrow_mut().push(import),
408 fn build_reduced_graph_for_use_tree(
410 // This particular use tree
411 use_tree: &ast::UseTree,
413 parent_prefix: &[Segment],
415 // The whole `use` item
421 "build_reduced_graph_for_use_tree(parent_prefix={:?}, use_tree={:?}, nested={})",
422 parent_prefix, use_tree, nested
425 let mut prefix_iter = parent_prefix
428 .chain(use_tree.prefix.segments.iter().map(|seg| seg.into()))
431 // On 2015 edition imports are resolved as crate-relative by default,
432 // so prefixes are prepended with crate root segment if necessary.
433 // The root is prepended lazily, when the first non-empty prefix or terminating glob
434 // appears, so imports in braced groups can have roots prepended independently.
435 let is_glob = matches!(use_tree.kind, ast::UseTreeKind::Glob);
436 let crate_root = match prefix_iter.peek() {
437 Some(seg) if !seg.ident.is_path_segment_keyword() && seg.ident.span.rust_2015() => {
438 Some(seg.ident.span.ctxt())
440 None if is_glob && use_tree.span.rust_2015() => Some(use_tree.span.ctxt()),
444 Segment::from_ident(Ident::new(
446 use_tree.prefix.span.shrink_to_lo().with_ctxt(ctxt),
450 let prefix = crate_root.into_iter().chain(prefix_iter).collect::<Vec<_>>();
451 debug!("build_reduced_graph_for_use_tree: prefix={:?}", prefix);
453 let empty_for_self = |prefix: &[Segment]| {
454 prefix.is_empty() || prefix.len() == 1 && prefix[0].ident.name == kw::PathRoot
456 match use_tree.kind {
457 ast::UseTreeKind::Simple(rename, id1, id2) => {
458 let mut ident = use_tree.ident();
459 let mut module_path = prefix;
460 let mut source = module_path.pop().unwrap();
461 let mut type_ns_only = false;
463 self.r.visibilities.insert(self.r.local_def_id(id), vis);
464 if id1 != ast::DUMMY_NODE_ID {
465 self.r.visibilities.insert(self.r.local_def_id(id1), vis);
467 if id2 != ast::DUMMY_NODE_ID {
468 self.r.visibilities.insert(self.r.local_def_id(id2), vis);
472 // Correctly handle `self`
473 if source.ident.name == kw::SelfLower {
476 if empty_for_self(&module_path) {
479 ResolutionError::SelfImportOnlyInImportListWithNonEmptyPrefix,
484 // Replace `use foo::{ self };` with `use foo;`
485 source = module_path.pop().unwrap();
486 if rename.is_none() {
487 ident = source.ident;
492 if source.ident.name == kw::SelfLower {
493 let parent = module_path.last();
495 let span = match parent {
496 // only `::self` from `use foo::self as bar`
497 Some(seg) => seg.ident.span.shrink_to_hi().to(source.ident.span),
498 None => source.ident.span,
500 let span_with_rename = match rename {
501 // only `self as bar` from `use foo::self as bar`
502 Some(rename) => source.ident.span.to(rename.span),
503 None => source.ident.span,
507 ResolutionError::SelfImportsOnlyAllowedWithin {
508 root: parent.is_none(),
513 // Error recovery: replace `use foo::self;` with `use foo;`
514 if let Some(parent) = module_path.pop() {
516 if rename.is_none() {
517 ident = source.ident;
522 // Disallow `use $crate;`
523 if source.ident.name == kw::DollarCrate && module_path.is_empty() {
524 let crate_root = self.r.resolve_crate_root(source.ident);
525 let crate_name = match crate_root.kind {
526 ModuleKind::Def(.., name) => name,
527 ModuleKind::Block(..) => unreachable!(),
529 // HACK(eddyb) unclear how good this is, but keeping `$crate`
530 // in `source` breaks `src/test/ui/imports/import-crate-var.rs`,
531 // while the current crate doesn't have a valid `crate_name`.
532 if crate_name != kw::Empty {
533 // `crate_name` should not be interpreted as relative.
534 module_path.push(Segment::from_ident_and_id(
535 Ident { name: kw::PathRoot, span: source.ident.span },
536 self.r.next_node_id(),
538 source.ident.name = crate_name;
540 if rename.is_none() {
541 ident.name = crate_name;
546 .struct_span_err(item.span, "`$crate` may not be imported")
551 if ident.name == kw::Crate {
552 self.r.session.span_err(
554 "crate root imports need to be explicitly named: \
555 `use crate as name;`",
559 let kind = ImportKind::Single {
560 source: source.ident,
562 source_bindings: PerNS {
563 type_ns: Cell::new(Err(Determinacy::Undetermined)),
564 value_ns: Cell::new(Err(Determinacy::Undetermined)),
565 macro_ns: Cell::new(Err(Determinacy::Undetermined)),
567 target_bindings: PerNS {
568 type_ns: Cell::new(None),
569 value_ns: Cell::new(None),
570 macro_ns: Cell::new(None),
574 additional_ids: (id1, id2),
588 ast::UseTreeKind::Glob => {
589 let kind = ImportKind::Glob {
590 is_prelude: self.r.session.contains_name(&item.attrs, sym::prelude_import),
591 max_vis: Cell::new(ty::Visibility::Invisible),
593 self.r.visibilities.insert(self.r.local_def_id(id), vis);
594 self.add_import(prefix, kind, use_tree.span, id, item, root_span, item.id, vis);
596 ast::UseTreeKind::Nested(ref items) => {
597 // Ensure there is at most one `self` in the list
598 let self_spans = items
600 .filter_map(|&(ref use_tree, _)| {
601 if let ast::UseTreeKind::Simple(..) = use_tree.kind {
602 if use_tree.ident().name == kw::SelfLower {
603 return Some(use_tree.span);
609 .collect::<Vec<_>>();
610 if self_spans.len() > 1 {
611 let mut e = self.r.into_struct_error(
613 ResolutionError::SelfImportCanOnlyAppearOnceInTheList,
616 for other_span in self_spans.iter().skip(1) {
617 e.span_label(*other_span, "another `self` import appears here");
623 for &(ref tree, id) in items {
624 self.build_reduced_graph_for_use_tree(
625 // This particular use tree
626 tree, id, &prefix, true, // The whole `use` item
627 item, vis, root_span,
631 // Empty groups `a::b::{}` are turned into synthetic `self` imports
632 // `a::b::c::{self as _}`, so that their prefixes are correctly
633 // resolved and checked for privacy/stability/etc.
634 if items.is_empty() && !empty_for_self(&prefix) {
635 let new_span = prefix[prefix.len() - 1].ident.span;
636 let tree = ast::UseTree {
637 prefix: ast::Path::from_ident(Ident::new(kw::SelfLower, new_span)),
638 kind: ast::UseTreeKind::Simple(
639 Some(Ident::new(kw::Underscore, new_span)),
645 self.build_reduced_graph_for_use_tree(
646 // This particular use tree
651 // The whole `use` item
653 ty::Visibility::Invisible,
661 /// Constructs the reduced graph for one item.
662 fn build_reduced_graph_for_item(&mut self, item: &'b Item) {
663 let parent_scope = &self.parent_scope;
664 let parent = parent_scope.module;
665 let expansion = parent_scope.expansion;
666 let ident = item.ident;
668 let vis = self.resolve_visibility(&item.vis);
669 let local_def_id = self.r.local_def_id(item.id);
670 let def_id = local_def_id.to_def_id();
672 self.r.visibilities.insert(local_def_id, vis);
675 ItemKind::Use(ref use_tree) => {
676 self.build_reduced_graph_for_use_tree(
677 // This particular use tree
682 // The whole `use` item
689 ItemKind::ExternCrate(orig_name) => {
690 self.build_reduced_graph_for_extern_crate(
699 ItemKind::Mod(..) => {
700 let module = self.r.new_module(
702 ModuleKind::Def(DefKind::Mod, def_id, ident.name),
703 expansion.to_expn_id(),
705 parent.no_implicit_prelude
706 || self.r.session.contains_name(&item.attrs, sym::no_implicit_prelude),
708 self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
710 // Descend into the module.
711 self.parent_scope.module = module;
714 // These items live in the value namespace.
715 ItemKind::Static(_, mt, _) => {
716 let res = Res::Def(DefKind::Static(mt), def_id);
717 self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
719 ItemKind::Const(..) => {
720 let res = Res::Def(DefKind::Const, def_id);
721 self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
723 ItemKind::Fn(..) => {
724 let res = Res::Def(DefKind::Fn, def_id);
725 self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion));
727 // Functions introducing procedural macros reserve a slot
728 // in the macro namespace as well (see #52225).
729 self.define_macro(item);
732 // These items live in the type namespace.
733 ItemKind::TyAlias(..) => {
734 let res = Res::Def(DefKind::TyAlias, def_id);
735 self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
738 ItemKind::Enum(_, _) => {
739 let module = self.r.new_module(
741 ModuleKind::Def(DefKind::Enum, def_id, ident.name),
742 expansion.to_expn_id(),
744 parent.no_implicit_prelude,
746 self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
747 self.parent_scope.module = module;
750 ItemKind::TraitAlias(..) => {
751 let res = Res::Def(DefKind::TraitAlias, def_id);
752 self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
755 // These items live in both the type and value namespaces.
756 ItemKind::Struct(ref vdata, _) => {
757 // Define a name in the type namespace.
758 let res = Res::Def(DefKind::Struct, def_id);
759 self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
761 // Record field names for error reporting.
762 self.insert_field_names_local(def_id, vdata);
764 // If this is a tuple or unit struct, define a name
765 // in the value namespace as well.
766 if let Some(ctor_node_id) = vdata.ctor_id() {
767 // If the structure is marked as non_exhaustive then lower the visibility
768 // to within the crate.
769 let mut ctor_vis = if vis == ty::Visibility::Public
770 && self.r.session.contains_name(&item.attrs, sym::non_exhaustive)
772 ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())
777 let mut ret_fields = Vec::with_capacity(vdata.fields().len());
779 for field in vdata.fields() {
780 // NOTE: The field may be an expansion placeholder, but expansion sets
781 // correct visibilities for unnamed field placeholders specifically, so the
782 // constructor visibility should still be determined correctly.
784 .try_resolve_visibility(&field.vis, false)
785 .unwrap_or(ty::Visibility::Public);
786 if ctor_vis.is_at_least(field_vis, &*self.r) {
787 ctor_vis = field_vis;
789 ret_fields.push(field_vis);
791 let ctor_def_id = self.r.local_def_id(ctor_node_id);
792 let ctor_res = Res::Def(
793 DefKind::Ctor(CtorOf::Struct, CtorKind::from_ast(vdata)),
794 ctor_def_id.to_def_id(),
796 self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, sp, expansion));
797 self.r.visibilities.insert(ctor_def_id, ctor_vis);
799 self.r.struct_constructors.insert(def_id, (ctor_res, ctor_vis, ret_fields));
803 ItemKind::Union(ref vdata, _) => {
804 let res = Res::Def(DefKind::Union, def_id);
805 self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion));
807 // Record field names for error reporting.
808 self.insert_field_names_local(def_id, vdata);
811 ItemKind::Trait(..) => {
812 // Add all the items within to a new module.
813 let module = self.r.new_module(
815 ModuleKind::Def(DefKind::Trait, def_id, ident.name),
816 expansion.to_expn_id(),
818 parent.no_implicit_prelude,
820 self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion));
821 self.parent_scope.module = module;
824 // These items do not add names to modules.
825 ItemKind::Impl(box Impl { of_trait: Some(..), .. }) => {
826 self.r.trait_impl_items.insert(local_def_id);
828 ItemKind::Impl { .. } | ItemKind::ForeignMod(..) | ItemKind::GlobalAsm(..) => {}
830 ItemKind::MacroDef(..) | ItemKind::MacCall(_) => unreachable!(),
834 fn build_reduced_graph_for_extern_crate(
836 orig_name: Option<Symbol>,
838 local_def_id: LocalDefId,
842 let ident = item.ident;
844 let parent_scope = self.parent_scope;
845 let expansion = parent_scope.expansion;
847 let (used, module, binding) = if orig_name.is_none() && ident.name == kw::SelfLower {
850 .struct_span_err(item.span, "`extern crate self;` requires renaming")
853 "rename the `self` crate to be able to import it",
854 "extern crate self as name;",
855 Applicability::HasPlaceholders,
859 } else if orig_name == Some(kw::SelfLower) {
860 Some(self.r.graph_root)
862 self.r.crate_loader.process_extern_crate(item, &self.r.definitions, local_def_id).map(
864 self.r.extern_crate_map.insert(local_def_id, crate_id);
865 self.r.expect_module(crate_id.as_def_id())
870 let used = self.process_macro_use_imports(item, module);
872 (module, ty::Visibility::Public, sp, expansion).to_name_binding(self.r.arenas);
873 (used, Some(ModuleOrUniformRoot::Module(module)), binding)
875 .unwrap_or((true, None, self.r.dummy_binding));
876 let import = self.r.arenas.alloc_import(Import {
877 kind: ImportKind::ExternCrate { source: orig_name, target: ident },
880 parent_scope: self.parent_scope,
881 imported_module: Cell::new(module),
882 has_attributes: !item.attrs.is_empty(),
883 use_span_with_attributes: item.span_with_attributes(),
885 root_span: item.span,
887 module_path: Vec::new(),
889 used: Cell::new(used),
891 self.r.potentially_unused_imports.push(import);
892 let imported_binding = self.r.import(binding, import);
893 if ptr::eq(parent, self.r.graph_root) {
894 if let Some(entry) = self.r.extern_prelude.get(&ident.normalize_to_macros_2_0()) {
895 if expansion != LocalExpnId::ROOT
896 && orig_name.is_some()
897 && entry.extern_crate_item.is_none()
899 let msg = "macro-expanded `extern crate` items cannot \
900 shadow names passed with `--extern`";
901 self.r.session.span_err(item.span, msg);
904 let entry = self.r.extern_prelude.entry(ident.normalize_to_macros_2_0()).or_insert(
905 ExternPreludeEntry { extern_crate_item: None, introduced_by_item: true },
907 entry.extern_crate_item = Some(imported_binding);
908 if orig_name.is_some() {
909 entry.introduced_by_item = true;
912 self.r.define(parent, ident, TypeNS, imported_binding);
915 /// Constructs the reduced graph for one foreign item.
916 fn build_reduced_graph_for_foreign_item(&mut self, item: &ForeignItem) {
917 let local_def_id = self.r.local_def_id(item.id);
918 let def_id = local_def_id.to_def_id();
919 let (def_kind, ns) = match item.kind {
920 ForeignItemKind::Fn(..) => (DefKind::Fn, ValueNS),
921 ForeignItemKind::Static(_, mt, _) => (DefKind::Static(mt), ValueNS),
922 ForeignItemKind::TyAlias(..) => (DefKind::ForeignTy, TypeNS),
923 ForeignItemKind::MacCall(_) => unreachable!(),
925 let parent = self.parent_scope.module;
926 let expansion = self.parent_scope.expansion;
927 let vis = self.resolve_visibility(&item.vis);
928 let res = Res::Def(def_kind, def_id);
929 self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion));
930 self.r.visibilities.insert(local_def_id, vis);
933 fn build_reduced_graph_for_block(&mut self, block: &Block) {
934 let parent = self.parent_scope.module;
935 let expansion = self.parent_scope.expansion;
936 if self.block_needs_anonymous_module(block) {
937 let module = self.r.new_module(
939 ModuleKind::Block(block.id),
940 expansion.to_expn_id(),
942 parent.no_implicit_prelude,
944 self.r.block_map.insert(block.id, module);
945 self.parent_scope.module = module; // Descend into the block.
949 /// Builds the reduced graph for a single item in an external crate.
950 fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) {
951 let parent = self.parent_scope.module;
952 let ModChild { ident, res, vis, span, macro_rules } = child;
953 let res = res.expect_non_local();
954 let expansion = self.parent_scope.expansion;
955 // Record primary definitions.
957 Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, def_id) => {
958 let module = self.r.expect_module(def_id);
959 self.r.define(parent, ident, TypeNS, (module, vis, span, expansion));
968 | DefKind::TraitAlias
973 | Res::ToolMod => self.r.define(parent, ident, TypeNS, (res, vis, span, expansion)),
979 | DefKind::AssocConst
982 ) => self.r.define(parent, ident, ValueNS, (res, vis, span, expansion)),
983 Res::Def(DefKind::Macro(..), _) | Res::NonMacroAttr(..) => {
985 self.r.define(parent, ident, MacroNS, (res, vis, span, expansion))
990 | DefKind::ConstParam
991 | DefKind::ExternCrate
993 | DefKind::ForeignMod
995 | DefKind::InlineConst
997 | DefKind::LifetimeParam
1001 | DefKind::Generator,
1005 | Res::SelfTy { .. }
1007 | Res::Err => bug!("unexpected resolution: {:?}", res),
1009 // Record some extra data for better diagnostics.
1010 let cstore = self.r.cstore();
1012 Res::Def(DefKind::Struct, def_id) => {
1014 cstore.struct_field_names_untracked(def_id, self.r.session).collect();
1015 let ctor = cstore.ctor_def_id_and_kind_untracked(def_id);
1016 if let Some((ctor_def_id, ctor_kind)) = ctor {
1017 let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);
1018 let ctor_vis = cstore.visibility_untracked(ctor_def_id);
1019 let field_visibilities =
1020 cstore.struct_field_visibilities_untracked(def_id).collect();
1022 .struct_constructors
1023 .insert(def_id, (ctor_res, ctor_vis, field_visibilities));
1025 self.insert_field_names(def_id, field_names);
1027 Res::Def(DefKind::Union, def_id) => {
1029 cstore.struct_field_names_untracked(def_id, self.r.session).collect();
1030 self.insert_field_names(def_id, field_names);
1032 Res::Def(DefKind::AssocFn, def_id) => {
1033 if cstore.fn_has_self_parameter_untracked(def_id) {
1034 self.r.has_self.insert(def_id);
1041 fn add_macro_use_binding(
1044 binding: &'a NameBinding<'a>,
1046 allow_shadowing: bool,
1048 if self.r.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing {
1049 let msg = format!("`{}` is already in scope", name);
1051 "macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)";
1052 self.r.session.struct_span_err(span, &msg).note(note).emit();
1056 /// Returns `true` if we should consider the underlying `extern crate` to be used.
1057 fn process_macro_use_imports(&mut self, item: &Item, module: Module<'a>) -> bool {
1058 let mut import_all = None;
1059 let mut single_imports = Vec::new();
1060 for attr in &item.attrs {
1061 if attr.has_name(sym::macro_use) {
1062 if self.parent_scope.module.parent.is_some() {
1067 "an `extern crate` loading macros must be at the crate root"
1071 if let ItemKind::ExternCrate(Some(orig_name)) = item.kind {
1072 if orig_name == kw::SelfLower {
1077 "`#[macro_use]` is not supported on `extern crate self`",
1082 let ill_formed = |span| {
1083 struct_span_err!(self.r.session, span, E0466, "bad macro import").emit();
1086 Some(meta) => match meta.kind {
1087 MetaItemKind::Word => {
1088 import_all = Some(meta.span);
1091 MetaItemKind::List(nested_metas) => {
1092 for nested_meta in nested_metas {
1093 match nested_meta.ident() {
1094 Some(ident) if nested_meta.is_word() => {
1095 single_imports.push(ident)
1097 _ => ill_formed(nested_meta.span()),
1101 MetaItemKind::NameValue(..) => ill_formed(meta.span),
1103 None => ill_formed(attr.span),
1108 let macro_use_import = |this: &Self, span| {
1109 this.r.arenas.alloc_import(Import {
1110 kind: ImportKind::MacroUse,
1113 parent_scope: this.parent_scope,
1114 imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))),
1115 use_span_with_attributes: item.span_with_attributes(),
1116 has_attributes: !item.attrs.is_empty(),
1117 use_span: item.span,
1120 module_path: Vec::new(),
1121 vis: Cell::new(ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())),
1122 used: Cell::new(false),
1126 let allow_shadowing = self.parent_scope.expansion == LocalExpnId::ROOT;
1127 if let Some(span) = import_all {
1128 let import = macro_use_import(self, span);
1129 self.r.potentially_unused_imports.push(import);
1130 module.for_each_child(self, |this, ident, ns, binding| {
1132 let imported_binding = this.r.import(binding, import);
1133 this.add_macro_use_binding(ident.name, imported_binding, span, allow_shadowing);
1137 for ident in single_imports.iter().cloned() {
1138 let result = self.r.maybe_resolve_ident_in_module(
1139 ModuleOrUniformRoot::Module(module),
1144 if let Ok(binding) = result {
1145 let import = macro_use_import(self, ident.span);
1146 self.r.potentially_unused_imports.push(import);
1147 let imported_binding = self.r.import(binding, import);
1148 self.add_macro_use_binding(
1155 struct_span_err!(self.r.session, ident.span, E0469, "imported macro not found")
1160 import_all.is_some() || !single_imports.is_empty()
1163 /// Returns `true` if this attribute list contains `macro_use`.
1164 fn contains_macro_use(&mut self, attrs: &[ast::Attribute]) -> bool {
1166 if attr.has_name(sym::macro_escape) {
1167 let msg = "`#[macro_escape]` is a deprecated synonym for `#[macro_use]`";
1168 let mut err = self.r.session.struct_span_warn(attr.span, msg);
1169 if let ast::AttrStyle::Inner = attr.style {
1170 err.help("try an outer attribute: `#[macro_use]`").emit();
1174 } else if !attr.has_name(sym::macro_use) {
1178 if !attr.is_word() {
1179 self.r.session.span_err(attr.span, "arguments to `macro_use` are not allowed here");
1187 fn visit_invoc(&mut self, id: NodeId) -> LocalExpnId {
1188 let invoc_id = id.placeholder_to_expn_id();
1189 let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope);
1190 assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation");
1194 /// Visit invocation in context in which it can emit a named item (possibly `macro_rules`)
1195 /// directly into its parent scope's module.
1196 fn visit_invoc_in_module(&mut self, id: NodeId) -> MacroRulesScopeRef<'a> {
1197 let invoc_id = self.visit_invoc(id);
1198 self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id);
1199 self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Invocation(invoc_id))
1202 fn proc_macro_stub(&self, item: &ast::Item) -> Option<(MacroKind, Ident, Span)> {
1203 if self.r.session.contains_name(&item.attrs, sym::proc_macro) {
1204 return Some((MacroKind::Bang, item.ident, item.span));
1205 } else if self.r.session.contains_name(&item.attrs, sym::proc_macro_attribute) {
1206 return Some((MacroKind::Attr, item.ident, item.span));
1207 } else if let Some(attr) = self.r.session.find_by_name(&item.attrs, sym::proc_macro_derive)
1209 if let Some(nested_meta) = attr.meta_item_list().and_then(|list| list.get(0).cloned()) {
1210 if let Some(ident) = nested_meta.ident() {
1211 return Some((MacroKind::Derive, ident, ident.span));
1218 // Mark the given macro as unused unless its name starts with `_`.
1219 // Macro uses will remove items from this set, and the remaining
1220 // items will be reported as `unused_macros`.
1221 fn insert_unused_macro(&mut self, ident: Ident, def_id: LocalDefId, node_id: NodeId) {
1222 if !ident.as_str().starts_with('_') {
1223 self.r.unused_macros.insert(def_id, (node_id, ident));
1227 fn define_macro(&mut self, item: &ast::Item) -> MacroRulesScopeRef<'a> {
1228 let parent_scope = self.parent_scope;
1229 let expansion = parent_scope.expansion;
1230 let def_id = self.r.local_def_id(item.id);
1231 let (ext, ident, span, macro_rules) = match &item.kind {
1232 ItemKind::MacroDef(def) => {
1233 let ext = Lrc::new(self.r.compile_macro(item, self.r.session.edition()));
1234 (ext, item.ident, item.span, def.macro_rules)
1236 ItemKind::Fn(..) => match self.proc_macro_stub(item) {
1237 Some((macro_kind, ident, span)) => {
1238 self.r.proc_macro_stubs.insert(def_id);
1239 (self.r.dummy_ext(macro_kind), ident, span, false)
1241 None => return parent_scope.macro_rules,
1243 _ => unreachable!(),
1246 let res = Res::Def(DefKind::Macro(ext.macro_kind()), def_id.to_def_id());
1247 self.r.macro_map.insert(def_id.to_def_id(), ext);
1248 self.r.local_macro_def_scopes.insert(def_id, parent_scope.module);
1251 let ident = ident.normalize_to_macros_2_0();
1252 self.r.macro_names.insert(ident);
1253 let is_macro_export = self.r.session.contains_name(&item.attrs, sym::macro_export);
1254 let vis = if is_macro_export {
1255 ty::Visibility::Public
1257 ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())
1259 let binding = (res, vis, span, expansion).to_name_binding(self.r.arenas);
1260 self.r.set_binding_parent_module(binding, parent_scope.module);
1261 self.r.all_macro_rules.insert(ident.name, res);
1262 if is_macro_export {
1263 let module = self.r.graph_root;
1264 self.r.define(module, ident, MacroNS, (res, vis, span, expansion, IsMacroExport));
1266 self.r.check_reserved_macro_name(ident, res);
1267 self.insert_unused_macro(ident, def_id, item.id);
1269 self.r.visibilities.insert(def_id, vis);
1270 self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Binding(
1271 self.r.arenas.alloc_macro_rules_binding(MacroRulesBinding {
1272 parent_macro_rules_scope: parent_scope.macro_rules,
1278 let module = parent_scope.module;
1279 let vis = match item.kind {
1280 // Visibilities must not be resolved non-speculatively twice
1281 // and we already resolved this one as a `fn` item visibility.
1282 ItemKind::Fn(..) => {
1283 self.try_resolve_visibility(&item.vis, false).unwrap_or(ty::Visibility::Public)
1285 _ => self.resolve_visibility(&item.vis),
1287 if vis != ty::Visibility::Public {
1288 self.insert_unused_macro(ident, def_id, item.id);
1290 self.r.define(module, ident, MacroNS, (res, vis, span, expansion));
1291 self.r.visibilities.insert(def_id, vis);
1292 self.parent_scope.macro_rules
1297 macro_rules! method {
1298 ($visit:ident: $ty:ty, $invoc:path, $walk:ident) => {
1299 fn $visit(&mut self, node: &'b $ty) {
1300 if let $invoc(..) = node.kind {
1301 self.visit_invoc(node.id);
1303 visit::$walk(self, node);
1309 impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> {
1310 method!(visit_expr: ast::Expr, ast::ExprKind::MacCall, walk_expr);
1311 method!(visit_pat: ast::Pat, ast::PatKind::MacCall, walk_pat);
1312 method!(visit_ty: ast::Ty, ast::TyKind::MacCall, walk_ty);
1314 fn visit_item(&mut self, item: &'b Item) {
1315 let orig_module_scope = self.parent_scope.module;
1316 self.parent_scope.macro_rules = match item.kind {
1317 ItemKind::MacroDef(..) => {
1318 let macro_rules_scope = self.define_macro(item);
1319 visit::walk_item(self, item);
1322 ItemKind::MacCall(..) => {
1323 let macro_rules_scope = self.visit_invoc_in_module(item.id);
1324 visit::walk_item(self, item);
1328 let orig_macro_rules_scope = self.parent_scope.macro_rules;
1329 self.build_reduced_graph_for_item(item);
1330 visit::walk_item(self, item);
1332 ItemKind::Mod(..) if self.contains_macro_use(&item.attrs) => {
1333 self.parent_scope.macro_rules
1335 _ => orig_macro_rules_scope,
1339 self.parent_scope.module = orig_module_scope;
1342 fn visit_stmt(&mut self, stmt: &'b ast::Stmt) {
1343 if let ast::StmtKind::MacCall(..) = stmt.kind {
1344 self.parent_scope.macro_rules = self.visit_invoc_in_module(stmt.id);
1346 visit::walk_stmt(self, stmt);
1350 fn visit_foreign_item(&mut self, foreign_item: &'b ForeignItem) {
1351 if let ForeignItemKind::MacCall(_) = foreign_item.kind {
1352 self.visit_invoc_in_module(foreign_item.id);
1356 self.build_reduced_graph_for_foreign_item(foreign_item);
1357 visit::walk_foreign_item(self, foreign_item);
1360 fn visit_block(&mut self, block: &'b Block) {
1361 let orig_current_module = self.parent_scope.module;
1362 let orig_current_macro_rules_scope = self.parent_scope.macro_rules;
1363 self.build_reduced_graph_for_block(block);
1364 visit::walk_block(self, block);
1365 self.parent_scope.module = orig_current_module;
1366 self.parent_scope.macro_rules = orig_current_macro_rules_scope;
1369 fn visit_assoc_item(&mut self, item: &'b AssocItem, ctxt: AssocCtxt) {
1370 if let AssocItemKind::MacCall(_) = item.kind {
1372 AssocCtxt::Trait => {
1373 self.visit_invoc_in_module(item.id);
1375 AssocCtxt::Impl => {
1376 self.visit_invoc(item.id);
1382 let vis = self.resolve_visibility(&item.vis);
1383 let local_def_id = self.r.local_def_id(item.id);
1384 let def_id = local_def_id.to_def_id();
1386 if !(ctxt == AssocCtxt::Impl
1387 && matches!(item.vis.kind, ast::VisibilityKind::Inherited)
1391 .contains(&ty::DefIdTree::parent(&*self.r, def_id).unwrap().expect_local()))
1393 // Trait impl item visibility is inherited from its trait when not specified
1394 // explicitly. In that case we cannot determine it here in early resolve,
1395 // so we leave a hole in the visibility table to be filled later.
1396 self.r.visibilities.insert(local_def_id, vis);
1399 if ctxt == AssocCtxt::Trait {
1400 let (def_kind, ns) = match item.kind {
1401 AssocItemKind::Const(..) => (DefKind::AssocConst, ValueNS),
1402 AssocItemKind::Fn(box Fn { ref sig, .. }) => {
1403 if sig.decl.has_self() {
1404 self.r.has_self.insert(def_id);
1406 (DefKind::AssocFn, ValueNS)
1408 AssocItemKind::TyAlias(..) => (DefKind::AssocTy, TypeNS),
1409 AssocItemKind::MacCall(_) => bug!(), // handled above
1412 let parent = self.parent_scope.module;
1413 let expansion = self.parent_scope.expansion;
1414 let res = Res::Def(def_kind, def_id);
1415 self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion));
1418 visit::walk_assoc_item(self, item, ctxt);
1421 fn visit_attribute(&mut self, attr: &'b ast::Attribute) {
1422 if !attr.is_doc_comment() && attr::is_builtin_attr(attr) {
1425 .push((attr.get_normal_item().path.segments[0].ident, self.parent_scope));
1427 visit::walk_attribute(self, attr);
1430 fn visit_arm(&mut self, arm: &'b ast::Arm) {
1431 if arm.is_placeholder {
1432 self.visit_invoc(arm.id);
1434 visit::walk_arm(self, arm);
1438 fn visit_expr_field(&mut self, f: &'b ast::ExprField) {
1439 if f.is_placeholder {
1440 self.visit_invoc(f.id);
1442 visit::walk_expr_field(self, f);
1446 fn visit_pat_field(&mut self, fp: &'b ast::PatField) {
1447 if fp.is_placeholder {
1448 self.visit_invoc(fp.id);
1450 visit::walk_pat_field(self, fp);
1454 fn visit_generic_param(&mut self, param: &'b ast::GenericParam) {
1455 if param.is_placeholder {
1456 self.visit_invoc(param.id);
1458 visit::walk_generic_param(self, param);
1462 fn visit_param(&mut self, p: &'b ast::Param) {
1463 if p.is_placeholder {
1464 self.visit_invoc(p.id);
1466 visit::walk_param(self, p);
1470 fn visit_field_def(&mut self, sf: &'b ast::FieldDef) {
1471 if sf.is_placeholder {
1472 self.visit_invoc(sf.id);
1474 let vis = self.resolve_visibility(&sf.vis);
1475 self.r.visibilities.insert(self.r.local_def_id(sf.id), vis);
1476 visit::walk_field_def(self, sf);
1480 // Constructs the reduced graph for one variant. Variants exist in the
1481 // type and value namespaces.
1482 fn visit_variant(&mut self, variant: &'b ast::Variant) {
1483 if variant.is_placeholder {
1484 self.visit_invoc_in_module(variant.id);
1488 let parent = self.parent_scope.module;
1489 let expn_id = self.parent_scope.expansion;
1490 let ident = variant.ident;
1492 // Define a name in the type namespace.
1493 let def_id = self.r.local_def_id(variant.id);
1494 let res = Res::Def(DefKind::Variant, def_id.to_def_id());
1495 let vis = self.resolve_visibility(&variant.vis);
1496 self.r.define(parent, ident, TypeNS, (res, vis, variant.span, expn_id));
1497 self.r.visibilities.insert(def_id, vis);
1499 // If the variant is marked as non_exhaustive then lower the visibility to within the crate.
1500 let ctor_vis = if vis == ty::Visibility::Public
1501 && self.r.session.contains_name(&variant.attrs, sym::non_exhaustive)
1503 ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())
1508 // Define a constructor name in the value namespace.
1509 // Braced variants, unlike structs, generate unusable names in
1510 // value namespace, they are reserved for possible future use.
1511 // It's ok to use the variant's id as a ctor id since an
1512 // error will be reported on any use of such resolution anyway.
1513 let ctor_node_id = variant.data.ctor_id().unwrap_or(variant.id);
1514 let ctor_def_id = self.r.local_def_id(ctor_node_id);
1515 let ctor_kind = CtorKind::from_ast(&variant.data);
1516 let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id.to_def_id());
1517 self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, variant.span, expn_id));
1518 if ctor_def_id != def_id {
1519 self.r.visibilities.insert(ctor_def_id, ctor_vis);
1521 // Record field names for error reporting.
1522 self.insert_field_names_local(ctor_def_id.to_def_id(), &variant.data);
1524 visit::walk_variant(self, variant);
1527 fn visit_crate(&mut self, krate: &'b ast::Crate) {
1528 if krate.is_placeholder {
1529 self.visit_invoc_in_module(krate.id);
1531 visit::walk_crate(self, krate);
1532 self.contains_macro_use(&krate.attrs);