Rollup merge of #127437 - compiler-errors:uplift-trait-ref-is-knowable, r=lcnr

Uplift trait ref is knowable into `rustc_next_trait_solver`

Self-explanatory. Eliminates one more delegate method.

r? lcnr cc ``@fmease``

compiler/rustc_hir_analysis/src/coherence/orphan.rs

@@ -286,7 +286,7 @@ fn orphan_check<'tcx>(
     tcx: TyCtxt<'tcx>,
     impl_def_id: LocalDefId,
     mode: OrphanCheckMode,
-) -> Result<(), OrphanCheckErr<'tcx, FxIndexSet<DefId>>> {
+) -> Result<(), OrphanCheckErr<TyCtxt<'tcx>, FxIndexSet<DefId>>> {
     // We only accept this routine to be invoked on implementations
     // of a trait, not inherent implementations.
     let trait_ref = tcx.impl_trait_ref(impl_def_id).unwrap();
@@ -326,17 +326,16 @@ fn orphan_check<'tcx>(
             ty
         };
 
-        Ok(ty)
+        Ok::<_, !>(ty)
     };
 
-    let Ok(result) = traits::orphan_check_trait_ref::<!>(
+    let result = traits::orphan_check_trait_ref(
         &infcx,
         trait_ref,
         traits::InCrate::Local { mode },
         lazily_normalize_ty,
-    ) else {
-        unreachable!()
-    };
+    )
+    .into_ok();
 
     // (2)  Try to map the remaining inference vars back to generic params.
     result.map_err(|err| match err {
@@ -369,7 +368,7 @@ fn emit_orphan_check_error<'tcx>(
     tcx: TyCtxt<'tcx>,
     trait_ref: ty::TraitRef<'tcx>,
     impl_def_id: LocalDefId,
-    err: traits::OrphanCheckErr<'tcx, FxIndexSet<DefId>>,
+    err: traits::OrphanCheckErr<TyCtxt<'tcx>, FxIndexSet<DefId>>,
 ) -> ErrorGuaranteed {
     match err {
         traits::OrphanCheckErr::NonLocalInputType(tys) => {
@@ -482,7 +481,7 @@ fn emit_orphan_check_error<'tcx>(
 
 fn lint_uncovered_ty_params<'tcx>(
     tcx: TyCtxt<'tcx>,
-    UncoveredTyParams { uncovered, local_ty }: UncoveredTyParams<'tcx, FxIndexSet<DefId>>,
+    UncoveredTyParams { uncovered, local_ty }: UncoveredTyParams<TyCtxt<'tcx>, FxIndexSet<DefId>>,
     impl_def_id: LocalDefId,
 ) {
     let hir_id = tcx.local_def_id_to_hir_id(impl_def_id);

compiler/rustc_hir_analysis/src/collect.rs

@@ -1201,6 +1201,7 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
 
     let is_marker = tcx.has_attr(def_id, sym::marker);
     let rustc_coinductive = tcx.has_attr(def_id, sym::rustc_coinductive);
+    let is_fundamental = tcx.has_attr(def_id, sym::fundamental);
 
     // FIXME: We could probably do way better attribute validation here.
     let mut skip_array_during_method_dispatch = false;
@@ -1352,6 +1353,7 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
         has_auto_impl: is_auto,
         is_marker,
         is_coinductive: rustc_coinductive || is_auto,
+        is_fundamental,
         skip_array_during_method_dispatch,
         skip_boxed_slice_during_method_dispatch,
         specialization_kind,

compiler/rustc_hir_analysis/src/lib.rs

@@ -71,6 +71,7 @@ This API is completely unstable and subject to change.
 #![feature(rustdoc_internals)]
 #![feature(slice_partition_dedup)]
 #![feature(try_blocks)]
+#![feature(unwrap_infallible)]
 // tidy-alphabetical-end
 
 #[macro_use]