bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Rollup merge of #118396 - compiler-errors:ast-lang-items, r=cjgillot

Browse source 
Collect lang items from AST, get rid of `GenericBound::LangItemTrait`

r? `@cjgillot`
cc #115178

Looking forward, the work to remove `QPath::LangItem` will also be significantly more difficult, but I plan on doing it as well. Specifically, we have to change:
1. A lot of `rustc_ast_lowering` for things like expr `..`
2. A lot of astconv, since we actually instantiate lang and non-lang paths quite differently.
3. A ton of diagnostics and clippy lints that are special-cased via `QPath::LangItem`

Meanwhile, it was pretty easy to remove `GenericBound::LangItemTrait`, so I just did that here.
This commit is contained in:
Jubilee 2023-12-15 14:08:15 -08:00 • committed by GitHub
commit 1d54949765
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
31 changed files with 504 additions and 412 deletions
Download patch file Download diff file Expand all files Collapse all files

44
compiler/rustc_ast_lowering/src/lib.rs
View file

@ -453,6 +453,7 @@ pub fn lower_to_hir(tcx: TyCtxt<'_>, (): ()) -> hir::Crate<'_> {
tcx.ensure_with_value().output_filenames(());
tcx.ensure_with_value().early_lint_checks(());
tcx.ensure_with_value().debugger_visualizers(LOCAL_CRATE);
tcx.ensure_with_value().get_lang_items(());
let (mut resolver, krate) = tcx.resolver_for_lowering(()).steal();
let ast_index = index_crate(&resolver.node_id_to_def_id, &krate);
@ -765,6 +766,28 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
self.resolver.get_import_res(id).present_items()
}
fn make_lang_item_path(
&mut self,
lang_item: hir::LangItem,
span: Span,
args: Option<&'hir hir::GenericArgs<'hir>>,
) -> &'hir hir::Path<'hir> {
let def_id = self.tcx.require_lang_item(lang_item, Some(span));
let def_kind = self.tcx.def_kind(def_id);
let res = Res::Def(def_kind, def_id);
self.arena.alloc(hir::Path {
span,
res,
segments: self.arena.alloc_from_iter([hir::PathSegment {
ident: Ident::new(lang_item.name(), span),
hir_id: self.next_id(),
res,
args,
infer_args: false,
}]),
})
}
/// Reuses the span but adds information like the kind of the desugaring and features that are
/// allowed inside this span.
fn mark_span_with_reason(
@ -1976,18 +1999,27 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
CoroutineKind::AsyncGen { .. } => (sym::Item, hir::LangItem::AsyncIterator),
};
let future_args = self.arena.alloc(hir::GenericArgs {
let bound_args = self.arena.alloc(hir::GenericArgs {
args: &[],
bindings: arena_vec![self; self.assoc_ty_binding(assoc_ty_name, opaque_ty_span, output_ty)],
parenthesized: hir::GenericArgsParentheses::No,
span_ext: DUMMY_SP,
});
hir::GenericBound::LangItemTrait(
trait_lang_item,
opaque_ty_span,
self.next_id(),
future_args,
hir::GenericBound::Trait(
hir::PolyTraitRef {
bound_generic_params: &[],
trait_ref: hir::TraitRef {
path: self.make_lang_item_path(
trait_lang_item,
opaque_ty_span,
Some(bound_args),
),
hir_ref_id: self.next_id(),
},
span: opaque_ty_span,
},
hir::TraitBoundModifier::None,
)
}