Convert adt_sized_constraint to early-binder, use list

Author: compiler-errors

compiler/rustc_middle/src/query/mod.rs

@@ -706,7 +706,7 @@ rustc_queries! {
         separate_provide_extern
     }
 
-    query adt_sized_constraint(key: DefId) -> &'tcx [Ty<'tcx>] {
+    query adt_sized_constraint(key: DefId) -> ty::EarlyBinder<&'tcx ty::List<Ty<'tcx>>> {
         desc { |tcx| "computing `Sized` constraints for `{}`", tcx.def_path_str(key) }
     }
 

compiler/rustc_middle/src/ty/adt.rs

@@ -572,8 +572,8 @@ impl<'tcx> AdtDef<'tcx> {
     ///
     /// Due to normalization being eager, this applies even if
     /// the associated type is behind a pointer (e.g., issue #31299).
-    pub fn sized_constraint(self, tcx: TyCtxt<'tcx>) -> ty::EarlyBinder<&'tcx [Ty<'tcx>]> {
-        ty::EarlyBinder::bind(tcx.adt_sized_constraint(self.did()))
+    pub fn sized_constraint(self, tcx: TyCtxt<'tcx>) -> ty::EarlyBinder<&'tcx ty::List<Ty<'tcx>>> {
+        tcx.adt_sized_constraint(self.did())
     }
 }
 

compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs

@@ -150,7 +150,7 @@ pub(in crate::solve) fn instantiate_constituent_tys_for_sized_trait<'tcx>(
 
         ty::Adt(def, args) => {
             let sized_crit = def.sized_constraint(ecx.tcx());
-            Ok(sized_crit.iter_instantiated_copied(ecx.tcx(), args).collect())
+            Ok(sized_crit.iter_instantiated(ecx.tcx(), args).collect())
         }
     }
 }

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -2099,7 +2099,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 Where(
                     obligation
                         .predicate
-                        .rebind(sized_crit.iter_instantiated_copied(self.tcx(), args).collect()),
+                        .rebind(sized_crit.iter_instantiated(self.tcx(), args).collect()),
                 )
             }
 

compiler/rustc_ty_utils/src/ty.rs

@@ -42,7 +42,7 @@ fn sized_constraint_for_ty<'tcx>(
             let adt_tys = adt.sized_constraint(tcx);
             debug!("sized_constraint_for_ty({:?}) intermediate = {:?}", ty, adt_tys);
             adt_tys
-                .iter_instantiated_copied(tcx, args)
+                .iter_instantiated(tcx, args)
                 .flat_map(|ty| sized_constraint_for_ty(tcx, adtdef, ty))
                 .collect()
         }
@@ -92,10 +92,13 @@ fn defaultness(tcx: TyCtxt<'_>, def_id: LocalDefId) -> hir::Defaultness {
 ///     - a tuple of type parameters or projections, if there are multiple
 ///       such.
 ///     - an Error, if a type is infinitely sized
-fn adt_sized_constraint(tcx: TyCtxt<'_>, def_id: DefId) -> &[Ty<'_>] {
+fn adt_sized_constraint<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    def_id: DefId,
+) -> ty::EarlyBinder<&'tcx ty::List<Ty<'tcx>>> {
     if let Some(def_id) = def_id.as_local() {
         if matches!(tcx.representability(def_id), ty::Representability::Infinite) {
-            return tcx.mk_type_list(&[Ty::new_misc_error(tcx)]);
+            return ty::EarlyBinder::bind(tcx.mk_type_list(&[Ty::new_misc_error(tcx)]));
         }
     }
     let def = tcx.adt_def(def_id);
@@ -107,7 +110,7 @@ fn adt_sized_constraint(tcx: TyCtxt<'_>, def_id: DefId) -> &[Ty<'_>] {
 
     debug!("adt_sized_constraint: {:?} => {:?}", def, result);
 
-    result
+    ty::EarlyBinder::bind(result)
 }
 
 /// See `ParamEnv` struct definition for details.