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new solver: prefer trivial builtin impls over where-clauses

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for now, only builtin `Sized` impls are tracked as being `Trivial`
This commit is contained in:
Rémy Rakic 2025-01-17 17:00:59 +00:00
parent 73c0ae6aec
commit 00844be421
8 changed files with 41 additions and 6 deletions
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4
compiler/rustc_trait_selection/src/traits/project.rs
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@ -991,7 +991,7 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
Err(ErrorGuaranteed { .. }) => true,
}
}
ImplSource::Builtin(BuiltinImplSource::Misc, _) => {
ImplSource::Builtin(BuiltinImplSource::Misc | BuiltinImplSource::Trivial, _) => {
// While a builtin impl may be known to exist, the associated type may not yet
// be known. Any type with multiple potential associated types is therefore
// not eligible.
@ -1296,7 +1296,7 @@ fn confirm_select_candidate<'cx, 'tcx>(
) -> Progress<'tcx> {
match impl_source {
ImplSource::UserDefined(data) => confirm_impl_candidate(selcx, obligation, data),
ImplSource::Builtin(BuiltinImplSource::Misc, data) => {
ImplSource::Builtin(BuiltinImplSource::Misc | BuiltinImplSource::Trivial, data) => {
let tcx = selcx.tcx();
let trait_def_id = obligation.predicate.trait_def_id(tcx);
if tcx.is_lang_item(trait_def_id, LangItem::Coroutine) {