finish RegionKind rename

- `ReFree` -> `ReLateParam`
- `ReEarlyBound` -> `ReEarlyParam`

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -532,8 +532,8 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateBound<'_, 'tcx> {
     }
 
     fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
-        if let ty::ReFree(fr) = *r {
-            ty::Region::new_free(
+        if let ty::ReLateParam(fr) = *r {
+            ty::Region::new_late_param(
                 self.tcx,
                 fr.scope,
                 self.mapping.get(&fr.bound_region).copied().unwrap_or(fr.bound_region),
@@ -1078,20 +1078,20 @@ impl<'tcx> ty::FallibleTypeFolder<TyCtxt<'tcx>> for RemapHiddenTyRegions<'tcx> {
         region: ty::Region<'tcx>,
     ) -> Result<ty::Region<'tcx>, Self::Error> {
         match region.kind() {
-            // Remap all free regions, which correspond to late-bound regions in the function.
-            ty::ReFree(_) => {}
+            // Remap late-bound regions from the function.
+            ty::ReLateParam(_) => {}
             // Remap early-bound regions as long as they don't come from the `impl` itself,
             // in which case we don't really need to renumber them.
-            ty::ReEarlyBound(ebr) if self.tcx.parent(ebr.def_id) != self.impl_def_id => {}
+            ty::ReEarlyParam(ebr) if self.tcx.parent(ebr.def_id) != self.impl_def_id => {}
             _ => return Ok(region),
         }
 
         let e = if let Some(region) = self.map.get(&region) {
-            if let ty::ReEarlyBound(e) = region.kind() { e } else { bug!() }
+            if let ty::ReEarlyParam(e) = region.kind() { e } else { bug!() }
         } else {
             let guar = match region.kind() {
-                ty::ReEarlyBound(ty::EarlyBoundRegion { def_id, .. })
-                | ty::ReFree(ty::FreeRegion {
+                ty::ReEarlyParam(ty::EarlyParamRegion { def_id, .. })
+                | ty::ReLateParam(ty::LateParamRegion {
                     bound_region: ty::BoundRegionKind::BrNamed(def_id, _),
                     ..
                 }) => {
@@ -1119,9 +1119,9 @@ impl<'tcx> ty::FallibleTypeFolder<TyCtxt<'tcx>> for RemapHiddenTyRegions<'tcx> {
             return Err(guar);
         };
 
-        Ok(ty::Region::new_early_bound(
+        Ok(ty::Region::new_early_param(
             self.tcx,
-            ty::EarlyBoundRegion {
+            ty::EarlyParamRegion {
                 def_id: e.def_id,
                 name: e.name,
                 index: (e.index as usize - self.num_trait_args + self.num_impl_args) as u32,

compiler/rustc_hir_analysis/src/check/dropck.rs

@@ -81,8 +81,7 @@ fn ensure_drop_params_and_item_params_correspond<'tcx>(
     self_type_did: DefId,
     adt_to_impl_args: GenericArgsRef<'tcx>,
 ) -> Result<(), ErrorGuaranteed> {
-    let Err(arg) = tcx.uses_unique_generic_params(adt_to_impl_args, CheckRegions::OnlyEarlyBound)
-    else {
+    let Err(arg) = tcx.uses_unique_generic_params(adt_to_impl_args, CheckRegions::OnlyParam) else {
         return Ok(());
     };
 

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -595,9 +595,9 @@ fn gather_gat_bounds<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
                 // Same for the region. In our example, 'a corresponds
                 // to the 'me parameter.
                 let region_param = gat_generics.param_at(*region_a_idx, tcx);
-                let region_param = ty::Region::new_early_bound(
+                let region_param = ty::Region::new_early_param(
                     tcx,
-                    ty::EarlyBoundRegion {
+                    ty::EarlyParamRegion {
                         def_id: region_param.def_id,
                         index: region_param.index,
                         name: region_param.name,
@@ -628,9 +628,9 @@ fn gather_gat_bounds<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
                 debug!("required clause: {region_a} must outlive {region_b}");
                 // Translate into the generic parameters of the GAT.
                 let region_a_param = gat_generics.param_at(*region_a_idx, tcx);
-                let region_a_param = ty::Region::new_early_bound(
+                let region_a_param = ty::Region::new_early_param(
                     tcx,
-                    ty::EarlyBoundRegion {
+                    ty::EarlyParamRegion {
                         def_id: region_a_param.def_id,
                         index: region_a_param.index,
                         name: region_a_param.name,
@@ -638,9 +638,9 @@ fn gather_gat_bounds<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
                 );
                 // Same for the region.
                 let region_b_param = gat_generics.param_at(*region_b_idx, tcx);
-                let region_b_param = ty::Region::new_early_bound(
+                let region_b_param = ty::Region::new_early_param(
                     tcx,
-                    ty::EarlyBoundRegion {
+                    ty::EarlyParamRegion {
                         def_id: region_b_param.def_id,
                         index: region_b_param.index,
                         name: region_b_param.name,