Auto merge of #125076 - compiler-errors:alias-term, r=lcnr

Split out `ty::AliasTerm` from `ty::AliasTy`

Splitting out `AliasTerm` (for use in project and normalizes goals) and `AliasTy` (for use in `ty::Alias`)

r? lcnr

compiler/rustc_trait_selection/src/traits/coherence.rs

@@ -1096,11 +1096,11 @@ impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a, 'tcx> {
             Some(ty::PredicateKind::Clause(ty::ClauseKind::Trait(tr))) => tr.trait_ref,
             Some(ty::PredicateKind::Clause(ty::ClauseKind::Projection(proj)))
                 if matches!(
-                    infcx.tcx.def_kind(proj.projection_ty.def_id),
+                    infcx.tcx.def_kind(proj.projection_term.def_id),
                     DefKind::AssocTy | DefKind::AssocConst
                 ) =>
             {
-                proj.projection_ty.trait_ref(infcx.tcx)
+                proj.projection_term.trait_ref(infcx.tcx)
             }
             _ => return,
         };