let def_data = match i.node {
ItemKind::Impl(..) => DefPathData::Impl,
ItemKind::Trait(..) => DefPathData::Trait(i.ident.as_interned_str()),
+ ItemKind::TraitAlias(..) => DefPathData::TraitAlias(i.ident.as_interned_str()),
ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) |
- ItemKind::TraitAlias(..) | ItemKind::Existential(..) |
- ItemKind::ExternCrate(..) | ItemKind::ForeignMod(..) | ItemKind::Ty(..) =>
- DefPathData::TypeNs(i.ident.as_interned_str()),
+ ItemKind::Existential(..) | ItemKind::ExternCrate(..) | ItemKind::ForeignMod(..) |
+ ItemKind::Ty(..) => DefPathData::TypeNs(i.ident.as_interned_str()),
ItemKind::Mod(..) if i.ident == keywords::Invalid.ident() => {
return visit::walk_item(self, i);
}
/// GlobalMetaData identifies a piece of crate metadata that is global to
/// a whole crate (as opposed to just one item). GlobalMetaData components
/// are only supposed to show up right below the crate root.
- GlobalMetaData(InternedString)
+ GlobalMetaData(InternedString),
+ /// A trait alias.
+ TraitAlias(InternedString),
}
#[derive(Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord, Debug,
match *self {
TypeNs(name) |
Trait(name) |
+ TraitAlias(name) |
AssocTypeInTrait(name) |
AssocTypeInImpl(name) |
AssocExistentialInImpl(name) |
let s = match *self {
TypeNs(name) |
Trait(name) |
+ TraitAlias(name) |
AssocTypeInTrait(name) |
AssocTypeInImpl(name) |
AssocExistentialInImpl(name) |
let def_id = obligation.predicate.def_id();
- if ty::is_trait_alias(self.tcx(), def_id) {
+ if self.tcx().is_trait_alias(def_id) {
candidates.vec.push(TraitAliasCandidate(def_id.clone()));
}
data @ DefPathData::Misc |
data @ DefPathData::TypeNs(..) |
data @ DefPathData::Trait(..) |
+ data @ DefPathData::TraitAlias(..) |
data @ DefPathData::AssocTypeInTrait(..) |
data @ DefPathData::AssocTypeInImpl(..) |
data @ DefPathData::AssocExistentialInImpl(..) |
None
}
-/// Returns `true` if `def_id` is a trait alias.
-pub fn is_trait_alias(tcx: TyCtxt<'_, '_, '_>, def_id: DefId) -> bool {
- if let Some(node_id) = tcx.hir().as_local_node_id(def_id) {
- if let Node::Item(item) = tcx.hir().get(node_id) {
- if let hir::ItemKind::TraitAlias(..) = item.node {
- return true;
- }
- }
- }
- false
-}
-
/// See `ParamEnv` struct definition for details.
fn param_env<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
def_id: DefId)
}
}
+ /// True if `def_id` refers to a trait alias (i.e., `trait Foo = ...;`).
+ pub fn is_trait_alias(self, def_id: DefId) -> bool {
+ if let DefPathData::TraitAlias(_) = self.def_key(def_id).disambiguated_data.data {
+ true
+ } else {
+ false
+ }
+ }
+
/// True if this def-id refers to the implicit constructor for
/// a tuple struct like `struct Foo(u32)`.
pub fn is_struct_constructor(self, def_id: DefId) -> bool {
DefPathData::AssocTypeInImpl(_) |
DefPathData::AssocExistentialInImpl(_) |
DefPathData::Trait(_) |
+ DefPathData::TraitAlias(_) |
DefPathData::Impl |
DefPathData::TypeNs(_) => {
break;
EntryKind::Mod(_) => Def::Mod(did),
EntryKind::Variant(_) => Def::Variant(did),
EntryKind::Trait(_) => Def::Trait(did),
+ EntryKind::TraitAlias(_) => Def::TraitAlias(did),
EntryKind::Enum(..) => Def::Enum(did),
EntryKind::MacroDef(_) => Def::Macro(did, MacroKind::Bang),
EntryKind::ForeignType => Def::ForeignTy(did),
}
pub fn get_trait_def(&self, item_id: DefIndex, sess: &Session) -> ty::TraitDef {
- let data = match self.entry(item_id).kind {
- EntryKind::Trait(data) => data.decode((self, sess)),
- _ => bug!(),
- };
-
- ty::TraitDef::new(self.local_def_id(item_id),
- data.unsafety,
- data.paren_sugar,
- data.has_auto_impl,
- data.is_marker,
- self.def_path_table.def_path_hash(item_id))
+ match self.entry(item_id).kind {
+ EntryKind::Trait(data) => {
+ let data = data.decode((self, sess));
+ ty::TraitDef::new(self.local_def_id(item_id),
+ data.unsafety,
+ data.paren_sugar,
+ data.has_auto_impl,
+ data.is_marker,
+ self.def_path_table.def_path_hash(item_id))
+ },
+ EntryKind::TraitAlias(_) => {
+ ty::TraitDef::new(self.local_def_id(item_id),
+ hir::Unsafety::Normal,
+ false,
+ false,
+ false,
+ self.def_path_table.def_path_hash(item_id))
+ },
+ _ => bug!("def-index does not refer to trait or trait alias"),
+ }
}
fn get_variant(&self,
item_id: DefIndex,
tcx: TyCtxt<'a, 'tcx, 'tcx>)
-> ty::GenericPredicates<'tcx> {
- match self.entry(item_id).kind {
- EntryKind::Trait(data) => data.decode(self).super_predicates.decode((self, tcx)),
- _ => bug!(),
- }
+ let super_predicates = match self.entry(item_id).kind {
+ EntryKind::Trait(data) => data.decode(self).super_predicates,
+ EntryKind::TraitAlias(data) => data.decode(self).super_predicates,
+ _ => bug!("def-index does not refer to trait or trait alias"),
+ };
+
+ super_predicates.decode((self, tcx))
}
pub fn get_generics(&self,
}
def_key.parent.and_then(|parent_index| {
match self.entry(parent_index).kind {
- EntryKind::Trait(_) => Some(self.local_def_id(parent_index)),
+ EntryKind::Trait(_) |
+ EntryKind::TraitAlias(_) => Some(self.local_def_id(parent_index)),
_ => None,
}
})
EntryKind::Impl(self.lazy(&data))
}
- hir::ItemKind::Trait(..) |
- hir::ItemKind::TraitAlias(..) => {
+ hir::ItemKind::Trait(..) => {
let trait_def = tcx.trait_def(def_id);
let data = TraitData {
unsafety: trait_def.unsafety,
EntryKind::Trait(self.lazy(&data))
}
+ hir::ItemKind::TraitAlias(..) => {
+ let data = TraitAliasData {
+ super_predicates: self.lazy(&tcx.super_predicates_of(def_id)),
+ };
+
+ EntryKind::TraitAlias(self.lazy(&data))
+ }
hir::ItemKind::ExternCrate(_) |
hir::ItemKind::Use(..) => bug!("cannot encode info for item {:?}", item),
};
hir::ItemKind::Impl(..) |
hir::ItemKind::Existential(..) |
hir::ItemKind::Trait(..) => Some(self.encode_generics(def_id)),
+ hir::ItemKind::TraitAlias(..) => Some(self.encode_generics(def_id)),
_ => None,
},
predicates: match item.node {
hir::ItemKind::Union(..) |
hir::ItemKind::Impl(..) |
hir::ItemKind::Existential(..) |
- hir::ItemKind::Trait(..) => Some(self.encode_predicates(def_id)),
+ hir::ItemKind::Trait(..) |
+ hir::ItemKind::TraitAlias(..) => Some(self.encode_predicates(def_id)),
_ => None,
},
// hack. (No reason not to expand it in the future if
// necessary.)
predicates_defined_on: match item.node {
- hir::ItemKind::Trait(..) => Some(self.encode_predicates_defined_on(def_id)),
+ hir::ItemKind::Trait(..) |
+ hir::ItemKind::TraitAlias(..) => Some(self.encode_predicates_defined_on(def_id)),
_ => None, // not *wrong* for other kinds of items, but not needed
},
AssociatedType(AssociatedContainer),
AssociatedExistential(AssociatedContainer),
AssociatedConst(AssociatedContainer, ConstQualif, Lazy<RenderedConst>),
+ TraitAlias(Lazy<TraitAliasData<'tcx>>),
}
impl<'a, 'gcx> HashStable<StableHashingContext<'a>> for EntryKind<'gcx> {
EntryKind::Trait(ref trait_data) => {
trait_data.hash_stable(hcx, hasher);
}
+ EntryKind::TraitAlias(ref trait_alias_data) => {
+ trait_alias_data.hash_stable(hcx, hasher);
+ }
EntryKind::Impl(ref impl_data) => {
impl_data.hash_stable(hcx, hasher);
}
super_predicates
});
+#[derive(RustcEncodable, RustcDecodable)]
+pub struct TraitAliasData<'tcx> {
+ pub super_predicates: Lazy<ty::GenericPredicates<'tcx>>,
+}
+
+impl_stable_hash_for!(struct TraitAliasData<'tcx> {
+ super_predicates
+});
+
#[derive(RustcEncodable, RustcDecodable)]
pub struct ImplData<'tcx> {
pub polarity: hir::ImplPolarity,
}
module.populated.set(true);
}
+ Def::TraitAlias(..) => {
+ self.define(parent, ident, TypeNS, (def, vis, DUMMY_SP, expansion));
+ }
Def::Struct(..) | Def::Union(..) => {
self.define(parent, ident, TypeNS, (def, vis, DUMMY_SP, expansion));
def_id: DefId,
) -> Clauses<'tcx> {
match tcx.def_key(def_id).disambiguated_data.data {
- DefPathData::Trait(_) => program_clauses_for_trait(tcx, def_id),
+ DefPathData::Trait(_) |
+ DefPathData::TraitAlias(_) => program_clauses_for_trait(tcx, def_id),
DefPathData::Impl => program_clauses_for_impl(tcx, def_id),
DefPathData::AssocTypeInImpl(..) => program_clauses_for_associated_type_value(tcx, def_id),
DefPathData::AssocTypeInTrait(..) => program_clauses_for_associated_type_def(tcx, def_id),
// In the case of trait aliases, however, we include all bounds in the where clause,
// so e.g., `trait Foo = where u32: PartialEq<Self>` would include `u32: PartialEq<Self>`
// as one of its "superpredicates".
- let is_trait_alias = ty::is_trait_alias(tcx, trait_def_id);
+ let is_trait_alias = tcx.is_trait_alias(trait_def_id);
let superbounds2 = icx.type_parameter_bounds_in_generics(
generics, item.id, self_param_ty, OnlySelfBounds(!is_trait_alias));