bjoernager/rust
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Move a wf-check into the site where the value is instantiated

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This commit is contained in:
Oli Scherer 2022-10-20 09:39:09 +00:00
parent 1481fd964b
commit 8286ea5a49
8 changed files with 95 additions and 59 deletions
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33
compiler/rustc_hir_analysis/src/collect.rs
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@ -1143,7 +1143,7 @@ fn fn_sig(tcx: TyCtxt<'_>, def_id: DefId) -> ty::PolyFnSig<'_> {
}
ImplItem(hir::ImplItem { kind: ImplItemKind::Fn(sig, _), generics, .. }) => {
// Do not try to inference the return type for a impl method coming from a trait
// Do not try to infer the return type for a impl method coming from a trait
if let Item(hir::Item { kind: ItemKind::Impl(i), .. }) =
tcx.hir().get(tcx.hir().get_parent_node(hir_id))
&& i.of_trait.is_some()
@ -1286,10 +1286,37 @@ fn infer_return_ty_for_fn_sig<'tcx>(
fn impl_trait_ref(tcx: TyCtxt<'_>, def_id: DefId) -> Option<ty::TraitRef<'_>> {
let icx = ItemCtxt::new(tcx, def_id);
match tcx.hir().expect_item(def_id.expect_local()).kind {
let item = tcx.hir().expect_item(def_id.expect_local());
match item.kind {
hir::ItemKind::Impl(ref impl_) => impl_.of_trait.as_ref().map(|ast_trait_ref| {
let selfty = tcx.type_of(def_id);
<dyn AstConv<'_>>::instantiate_mono_trait_ref(&icx, ast_trait_ref, selfty)
<dyn AstConv<'_>>::instantiate_mono_trait_ref(
&icx,
ast_trait_ref,
selfty,
match impl_.constness {
hir::Constness::Const => {
if let Some(trait_def_id) = ast_trait_ref.trait_def_id() && !tcx.has_attr(trait_def_id, sym::const_trait) {
let trait_name = tcx.item_name(trait_def_id);
let mut err = tcx.sess.struct_span_err(
ast_trait_ref.path.span,
&format!("const `impl` for trait `{trait_name}` which is not marked with `#[const_trait]`"),
);
if trait_def_id.is_local() {
let sp = tcx.def_span(trait_def_id).shrink_to_lo();
err.span_suggestion(sp, &format!("mark `{trait_name}` as const"), "#[const_trait]", rustc_errors::Applicability::MachineApplicable);
}
err.note("marking a trait with `#[const_trait]` ensures all default method bodies are `const`");
err.note("adding a non-const method body in the future would be a breaking change");
err.emit();
ty::BoundConstness::NotConst
} else {
ty::BoundConstness::ConstIfConst
}
},
hir::Constness::NotConst => ty::BoundConstness::NotConst,
},
)
}),
_ => bug!(),
}