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allow_internal_unstable(min_specialization) on newtype_index

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This commit is contained in:
clubby789 2024-01-14 13:48:58 +00:00
parent 0529ccf341
commit eb63d3a49d
2 changed files with 22 additions and 13 deletions
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32
compiler/rustc_trait_selection/src/traits/specialize/mod.rs
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@ -142,23 +142,29 @@ pub fn translate_args_with_cause<'tcx>(
pub(super) fn specializes(tcx: TyCtxt<'_>, (impl1_def_id, impl2_def_id): (DefId, DefId)) -> bool {
// The feature gate should prevent introducing new specializations, but not
// taking advantage of upstream ones.
// If specialization is enabled for this crate then no extra checks are needed.
// If it's not, and either of the `impl`s is local to this crate, then this definitely
// isn't specializing - unless specialization is enabled for the `impl` span,
// e.g. if it comes from an `allow_internal_unstable` macro
let features = tcx.features();
let specialization_enabled = features.specialization || features.min_specialization;
if !specialization_enabled && impl1_def_id.is_local() {
let span = tcx.def_span(impl1_def_id);
if !span.allows_unstable(sym::specialization)
&& !span.allows_unstable(sym::min_specialization)
{
return false;
if !specialization_enabled {
if impl1_def_id.is_local() {
let span = tcx.def_span(impl1_def_id);
if !span.allows_unstable(sym::specialization)
&& !span.allows_unstable(sym::min_specialization)
{
return false;
}
}
}
if !specialization_enabled && impl2_def_id.is_local() {
let span = tcx.def_span(impl2_def_id);
if !span.allows_unstable(sym::specialization)
&& !span.allows_unstable(sym::min_specialization)
{
return false;
if impl2_def_id.is_local() {
let span = tcx.def_span(impl2_def_id);
if !span.allows_unstable(sym::specialization)
&& !span.allows_unstable(sym::min_specialization)
{
return false;
}
}
}