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Rollup merge of #138384 - nnethercote:hir-ItemKind-idents, r=fmease

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Move `hir::Item::ident` into `hir::ItemKind`.

 `hir::Item` has an `ident` field.

- It's always non-empty for these item kinds: `ExternCrate`, `Static`, `Const`, `Fn`, `Macro`, `Mod`, `TyAlias`, `Enum`, `Struct`, `Union`, Trait`, TraitAalis`.

- It's always empty for these item kinds: `ForeignMod`, `GlobalAsm`, `Impl`.

- For `Use`, it is non-empty for `UseKind::Single` and empty for `UseKind::{Glob,ListStem}`.

All of this is quite non-obvious; the only documentation is a single comment saying "The name might be a dummy name in case of anonymous items". Some sites that handle items check for an empty ident, some don't. This is a very C-like way of doing things, but this is Rust, we have sum types, we can do this properly and never forget to check for the exceptional case and never YOLO possibly empty identifiers (or possibly dummy spans) around and hope that things will work out.

This is step towards `kw::Empty` elimination (#137978).

r? `@fmease`
This commit is contained in:
Matthias Krüger
2025-03-17 22:49:04 +01:00
committed by GitHub
parent 8279176ccd f2ddbcd24b
commit e1acc68c9d
83 changed files with 667 additions and 556 deletions
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24
compiler/rustc_hir_analysis/src/check/wfcheck.rs
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@@ -269,26 +269,26 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) -> Result<()
}
res
}
hir::ItemKind::Fn { sig, .. } => {
check_item_fn(tcx, def_id, item.ident, item.span, sig.decl)
hir::ItemKind::Fn { ident, sig, .. } => {
check_item_fn(tcx, def_id, ident, item.span, sig.decl)
}
hir::ItemKind::Static(ty, ..) => {
hir::ItemKind::Static(_, ty, ..) => {
check_item_type(tcx, def_id, ty.span, UnsizedHandling::Forbid)
}
hir::ItemKind::Const(ty, ..) => {
hir::ItemKind::Const(_, ty, ..) => {
check_item_type(tcx, def_id, ty.span, UnsizedHandling::Forbid)
}
hir::ItemKind::Struct(_, hir_generics) => {
hir::ItemKind::Struct(_, _, hir_generics) => {
let res = check_type_defn(tcx, item, false);
check_variances_for_type_defn(tcx, item, hir_generics);
res
}
hir::ItemKind::Union(_, hir_generics) => {
hir::ItemKind::Union(_, _, hir_generics) => {
let res = check_type_defn(tcx, item, true);
check_variances_for_type_defn(tcx, item, hir_generics);
res
}
hir::ItemKind::Enum(_, hir_generics) => {
hir::ItemKind::Enum(_, _, hir_generics) => {
let res = check_type_defn(tcx, item, true);
check_variances_for_type_defn(tcx, item, hir_generics);
res
@@ -297,7 +297,9 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) -> Result<()
hir::ItemKind::TraitAlias(..) => check_trait(tcx, item),
// `ForeignItem`s are handled separately.
hir::ItemKind::ForeignMod { .. } => Ok(()),
hir::ItemKind::TyAlias(hir_ty, hir_generics) if tcx.type_alias_is_lazy(item.owner_id) => {
hir::ItemKind::TyAlias(_, hir_ty, hir_generics)
if tcx.type_alias_is_lazy(item.owner_id) =>
{
let res = enter_wf_checking_ctxt(tcx, item.span, def_id, |wfcx| {
let ty = tcx.type_of(def_id).instantiate_identity();
let item_ty = wfcx.normalize(hir_ty.span, Some(WellFormedLoc::Ty(def_id)), ty);
@@ -822,10 +824,10 @@ fn could_be_self(trait_def_id: LocalDefId, ty: &hir::Ty<'_>) -> bool {
///
/// In such cases, suggest using `Self` instead.
fn check_dyn_incompatible_self_trait_by_name(tcx: TyCtxt<'_>, item: &hir::TraitItem<'_>) {
let (trait_name, trait_def_id) =
let (trait_ident, trait_def_id) =
match tcx.hir_node_by_def_id(tcx.hir_get_parent_item(item.hir_id()).def_id) {
hir::Node::Item(item) => match item.kind {
hir::ItemKind::Trait(..) => (item.ident, item.owner_id),
hir::ItemKind::Trait(_, _, ident, ..) => (ident, item.owner_id),
_ => return,
},
_ => return,
@@ -862,7 +864,7 @@ fn check_dyn_incompatible_self_trait_by_name(tcx: TyCtxt<'_>, item: &hir::TraitI
trait_should_be_self,
"associated item referring to unboxed trait object for its own trait",
)
.with_span_label(trait_name.span, "in this trait")
.with_span_label(trait_ident.span, "in this trait")
.with_multipart_suggestion(
"you might have meant to use `Self` to refer to the implementing type",
sugg,