330 lines
12 KiB
Rust
330 lines
12 KiB
Rust
use crate::{ImplTraitContext, Resolver};
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use rustc_ast::visit::{self, FnKind};
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use rustc_ast::*;
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use rustc_expand::expand::AstFragment;
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use rustc_hir::def_id::LocalDefId;
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use rustc_hir::definitions::*;
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use rustc_span::hygiene::LocalExpnId;
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use rustc_span::symbol::sym;
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use rustc_span::Span;
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pub(crate) fn collect_definitions(
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resolver: &mut Resolver<'_, '_>,
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fragment: &AstFragment,
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expansion: LocalExpnId,
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) {
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let (parent_def, impl_trait_context) = resolver.invocation_parents[&expansion];
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fragment.visit_with(&mut DefCollector { resolver, parent_def, expansion, impl_trait_context });
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}
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/// Creates `DefId`s for nodes in the AST.
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struct DefCollector<'a, 'b, 'tcx> {
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resolver: &'a mut Resolver<'b, 'tcx>,
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parent_def: LocalDefId,
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impl_trait_context: ImplTraitContext,
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expansion: LocalExpnId,
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}
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impl<'a, 'b, 'tcx> DefCollector<'a, 'b, 'tcx> {
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fn create_def(&mut self, node_id: NodeId, data: DefPathData, span: Span) -> LocalDefId {
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let parent_def = self.parent_def;
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debug!("create_def(node_id={:?}, data={:?}, parent_def={:?})", node_id, data, parent_def);
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self.resolver.create_def(
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parent_def,
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node_id,
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data,
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self.expansion.to_expn_id(),
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span.with_parent(None),
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)
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}
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fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: LocalDefId, f: F) {
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let orig_parent_def = std::mem::replace(&mut self.parent_def, parent_def);
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f(self);
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self.parent_def = orig_parent_def;
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}
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fn with_impl_trait<F: FnOnce(&mut Self)>(
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&mut self,
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impl_trait_context: ImplTraitContext,
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f: F,
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) {
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let orig_itc = std::mem::replace(&mut self.impl_trait_context, impl_trait_context);
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f(self);
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self.impl_trait_context = orig_itc;
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}
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fn collect_field(&mut self, field: &'a FieldDef, index: Option<usize>) {
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let index = |this: &Self| {
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index.unwrap_or_else(|| {
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let node_id = NodeId::placeholder_from_expn_id(this.expansion);
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this.resolver.placeholder_field_indices[&node_id]
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})
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};
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if field.is_placeholder {
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let old_index = self.resolver.placeholder_field_indices.insert(field.id, index(self));
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assert!(old_index.is_none(), "placeholder field index is reset for a node ID");
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self.visit_macro_invoc(field.id);
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} else {
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let name = field.ident.map_or_else(|| sym::integer(index(self)), |ident| ident.name);
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let def = self.create_def(field.id, DefPathData::ValueNs(name), field.span);
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self.with_parent(def, |this| visit::walk_field_def(this, field));
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}
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}
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fn visit_macro_invoc(&mut self, id: NodeId) {
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let id = id.placeholder_to_expn_id();
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let old_parent =
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self.resolver.invocation_parents.insert(id, (self.parent_def, self.impl_trait_context));
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assert!(old_parent.is_none(), "parent `LocalDefId` is reset for an invocation");
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}
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}
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impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
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fn visit_item(&mut self, i: &'a Item) {
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debug!("visit_item: {:?}", i);
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// Pick the def data. This need not be unique, but the more
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// information we encapsulate into, the better
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let def_data = match &i.kind {
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ItemKind::Impl { .. } => DefPathData::Impl,
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ItemKind::ForeignMod(..) => DefPathData::ForeignMod,
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ItemKind::Mod(..)
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| ItemKind::Trait(..)
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| ItemKind::TraitAlias(..)
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| ItemKind::Enum(..)
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| ItemKind::Struct(..)
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| ItemKind::Union(..)
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| ItemKind::ExternCrate(..)
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| ItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.name),
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ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) => {
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DefPathData::ValueNs(i.ident.name)
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}
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ItemKind::MacroDef(..) => DefPathData::MacroNs(i.ident.name),
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ItemKind::MacCall(..) => {
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visit::walk_item(self, i);
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return self.visit_macro_invoc(i.id);
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}
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ItemKind::GlobalAsm(..) => DefPathData::GlobalAsm,
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ItemKind::Use(..) => {
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return visit::walk_item(self, i);
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}
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};
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let def = self.create_def(i.id, def_data, i.span);
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self.with_parent(def, |this| {
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this.with_impl_trait(ImplTraitContext::Existential, |this| {
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match i.kind {
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ItemKind::Struct(ref struct_def, _) | ItemKind::Union(ref struct_def, _) => {
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// If this is a unit or tuple-like struct, register the constructor.
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if let Some(ctor_node_id) = struct_def.ctor_node_id() {
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this.create_def(ctor_node_id, DefPathData::Ctor, i.span);
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}
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}
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_ => {}
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}
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visit::walk_item(this, i);
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})
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});
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}
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fn visit_fn(&mut self, fn_kind: FnKind<'a>, span: Span, _: NodeId) {
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if let FnKind::Fn(_, _, sig, _, generics, body) = fn_kind {
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if let Async::Yes { closure_id, .. } = sig.header.asyncness {
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self.visit_generics(generics);
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// For async functions, we need to create their inner defs inside of a
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// closure to match their desugared representation. Besides that,
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// we must mirror everything that `visit::walk_fn` below does.
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self.visit_fn_header(&sig.header);
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for param in &sig.decl.inputs {
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self.visit_param(param);
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}
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self.visit_fn_ret_ty(&sig.decl.output);
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// If this async fn has no body (i.e. it's an async fn signature in a trait)
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// then the closure_def will never be used, and we should avoid generating a
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// def-id for it.
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if let Some(body) = body {
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let closure_def = self.create_def(closure_id, DefPathData::ClosureExpr, span);
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self.with_parent(closure_def, |this| this.visit_block(body));
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}
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return;
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}
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}
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visit::walk_fn(self, fn_kind);
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}
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fn visit_use_tree(&mut self, use_tree: &'a UseTree, id: NodeId, _nested: bool) {
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self.create_def(id, DefPathData::Use, use_tree.span);
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visit::walk_use_tree(self, use_tree, id);
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}
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fn visit_foreign_item(&mut self, foreign_item: &'a ForeignItem) {
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if let ForeignItemKind::MacCall(_) = foreign_item.kind {
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return self.visit_macro_invoc(foreign_item.id);
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}
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let def = self.create_def(
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foreign_item.id,
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DefPathData::ValueNs(foreign_item.ident.name),
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foreign_item.span,
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);
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self.with_parent(def, |this| {
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visit::walk_foreign_item(this, foreign_item);
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});
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}
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fn visit_variant(&mut self, v: &'a Variant) {
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if v.is_placeholder {
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return self.visit_macro_invoc(v.id);
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}
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let def = self.create_def(v.id, DefPathData::TypeNs(v.ident.name), v.span);
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self.with_parent(def, |this| {
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if let Some(ctor_node_id) = v.data.ctor_node_id() {
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this.create_def(ctor_node_id, DefPathData::Ctor, v.span);
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}
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visit::walk_variant(this, v)
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});
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}
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fn visit_variant_data(&mut self, data: &'a VariantData) {
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// The assumption here is that non-`cfg` macro expansion cannot change field indices.
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// It currently holds because only inert attributes are accepted on fields,
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// and every such attribute expands into a single field after it's resolved.
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for (index, field) in data.fields().iter().enumerate() {
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self.collect_field(field, Some(index));
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}
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}
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fn visit_generic_param(&mut self, param: &'a GenericParam) {
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if param.is_placeholder {
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self.visit_macro_invoc(param.id);
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return;
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}
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let name = param.ident.name;
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let def_path_data = match param.kind {
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GenericParamKind::Lifetime { .. } => DefPathData::LifetimeNs(name),
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GenericParamKind::Type { .. } => DefPathData::TypeNs(name),
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GenericParamKind::Const { .. } => DefPathData::ValueNs(name),
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};
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self.create_def(param.id, def_path_data, param.ident.span);
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// impl-Trait can happen inside generic parameters, like
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// ```
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// fn foo<U: Iterator<Item = impl Clone>>() {}
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// ```
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//
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// In that case, the impl-trait is lowered as an additional generic parameter.
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self.with_impl_trait(ImplTraitContext::Universal(self.parent_def), |this| {
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visit::walk_generic_param(this, param)
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});
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}
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fn visit_assoc_item(&mut self, i: &'a AssocItem, ctxt: visit::AssocCtxt) {
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let def_data = match &i.kind {
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AssocItemKind::Fn(..) | AssocItemKind::Const(..) => DefPathData::ValueNs(i.ident.name),
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AssocItemKind::Type(..) => DefPathData::TypeNs(i.ident.name),
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AssocItemKind::MacCall(..) => return self.visit_macro_invoc(i.id),
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};
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let def = self.create_def(i.id, def_data, i.span);
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self.with_parent(def, |this| visit::walk_assoc_item(this, i, ctxt));
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}
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fn visit_pat(&mut self, pat: &'a Pat) {
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match pat.kind {
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PatKind::MacCall(..) => self.visit_macro_invoc(pat.id),
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_ => visit::walk_pat(self, pat),
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}
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}
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fn visit_anon_const(&mut self, constant: &'a AnonConst) {
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let def = self.create_def(constant.id, DefPathData::AnonConst, constant.value.span);
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self.with_parent(def, |this| visit::walk_anon_const(this, constant));
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}
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fn visit_expr(&mut self, expr: &'a Expr) {
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let parent_def = match expr.kind {
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ExprKind::MacCall(..) => return self.visit_macro_invoc(expr.id),
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ExprKind::Closure(ref closure) => {
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// Async closures desugar to closures inside of closures, so
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// we must create two defs.
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let closure_def = self.create_def(expr.id, DefPathData::ClosureExpr, expr.span);
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match closure.asyncness {
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Async::Yes { closure_id, .. } => {
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self.create_def(closure_id, DefPathData::ClosureExpr, expr.span)
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}
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Async::No => closure_def,
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}
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}
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ExprKind::Async(_, async_id, _) => {
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self.create_def(async_id, DefPathData::ClosureExpr, expr.span)
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}
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_ => self.parent_def,
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};
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self.with_parent(parent_def, |this| visit::walk_expr(this, expr));
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}
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fn visit_ty(&mut self, ty: &'a Ty) {
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match ty.kind {
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TyKind::MacCall(..) => self.visit_macro_invoc(ty.id),
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_ => visit::walk_ty(self, ty),
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}
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}
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fn visit_stmt(&mut self, stmt: &'a Stmt) {
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match stmt.kind {
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StmtKind::MacCall(..) => self.visit_macro_invoc(stmt.id),
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_ => visit::walk_stmt(self, stmt),
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}
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}
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fn visit_arm(&mut self, arm: &'a Arm) {
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if arm.is_placeholder { self.visit_macro_invoc(arm.id) } else { visit::walk_arm(self, arm) }
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}
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fn visit_expr_field(&mut self, f: &'a ExprField) {
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if f.is_placeholder {
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self.visit_macro_invoc(f.id)
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} else {
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visit::walk_expr_field(self, f)
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}
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}
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fn visit_pat_field(&mut self, fp: &'a PatField) {
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if fp.is_placeholder {
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self.visit_macro_invoc(fp.id)
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} else {
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visit::walk_pat_field(self, fp)
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}
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}
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fn visit_param(&mut self, p: &'a Param) {
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if p.is_placeholder {
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self.visit_macro_invoc(p.id)
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} else {
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self.with_impl_trait(ImplTraitContext::Universal(self.parent_def), |this| {
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visit::walk_param(this, p)
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})
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}
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}
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// This method is called only when we are visiting an individual field
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// after expanding an attribute on it.
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fn visit_field_def(&mut self, field: &'a FieldDef) {
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self.collect_field(field, None);
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}
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fn visit_crate(&mut self, krate: &'a Crate) {
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if krate.is_placeholder {
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self.visit_macro_invoc(krate.id)
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} else {
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visit::walk_crate(self, krate)
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}
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}
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}
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