diff --git a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
index 49e999a3caa..807b5576976 100644
--- a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
@@ -189,7 +189,7 @@ pub(super) fn to_error_region_vid(&self, r: RegionVid) -> Option<RegionVid> {
     /// Returns `true` if a closure is inferred to be an `FnMut` closure.
     fn is_closure_fn_mut(&self, fr: RegionVid) -> bool {
         if let Some(ty::ReLateParam(late_param)) = self.to_error_region(fr).as_deref()
-            && let ty::BoundRegionKind::BrEnv = late_param.bound_region
+            && let ty::BoundRegionKind::ClosureEnv = late_param.bound_region
             && let DefiningTy::Closure(_, args) = self.regioncx.universal_regions().defining_ty
         {
             return args.as_closure().kind() == ty::ClosureKind::FnMut;
diff --git a/compiler/rustc_borrowck/src/diagnostics/region_name.rs b/compiler/rustc_borrowck/src/diagnostics/region_name.rs
index 6ca7251295d..fffd5899966 100644
--- a/compiler/rustc_borrowck/src/diagnostics/region_name.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/region_name.rs
@@ -301,7 +301,7 @@ fn give_name_from_error_region(&self, fr: RegionVid) -> Option<RegionName> {
             }
 
             ty::ReLateParam(late_param) => match late_param.bound_region {
-                ty::BoundRegionKind::BrNamed(region_def_id, name) => {
+                ty::BoundRegionKind::Named(region_def_id, name) => {
                     // Get the span to point to, even if we don't use the name.
                     let span = tcx.hir().span_if_local(region_def_id).unwrap_or(DUMMY_SP);
                     debug!(
@@ -332,7 +332,7 @@ fn give_name_from_error_region(&self, fr: RegionVid) -> Option<RegionName> {
                     }
                 }
 
-                ty::BoundRegionKind::BrEnv => {
+                ty::BoundRegionKind::ClosureEnv => {
                     let def_ty = self.regioncx.universal_regions().defining_ty;
 
                     let closure_kind = match def_ty {
@@ -369,7 +369,7 @@ fn give_name_from_error_region(&self, fr: RegionVid) -> Option<RegionName> {
                     })
                 }
 
-                ty::BoundRegionKind::BrAnon => None,
+                ty::BoundRegionKind::Anon => None,
             },
 
             ty::ReBound(..)
diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index dffdfb8ac1d..98180eca08b 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -1375,9 +1375,9 @@ fn check_terminator(
 
                     let region_ctxt_fn = || {
                         let reg_info = match br.kind {
-                            ty::BoundRegionKind::BrAnon => sym::anon,
-                            ty::BoundRegionKind::BrNamed(_, name) => name,
-                            ty::BoundRegionKind::BrEnv => sym::env,
+                            ty::BoundRegionKind::Anon => sym::anon,
+                            ty::BoundRegionKind::Named(_, name) => name,
+                            ty::BoundRegionKind::ClosureEnv => sym::env,
                         };
 
                         RegionCtxt::LateBound(reg_info)
diff --git a/compiler/rustc_borrowck/src/type_check/relate_tys.rs b/compiler/rustc_borrowck/src/type_check/relate_tys.rs
index cfc14d146bd..545b2b38af5 100644
--- a/compiler/rustc_borrowck/src/type_check/relate_tys.rs
+++ b/compiler/rustc_borrowck/src/type_check/relate_tys.rs
@@ -271,9 +271,9 @@ fn next_placeholder_region(&mut self, placeholder: ty::PlaceholderRegion) -> ty:
             .placeholder_region(self.type_checker.infcx, placeholder);
 
         let reg_info = match placeholder.bound.kind {
-            ty::BoundRegionKind::BrAnon => sym::anon,
-            ty::BoundRegionKind::BrNamed(_, name) => name,
-            ty::BoundRegionKind::BrEnv => sym::env,
+            ty::BoundRegionKind::Anon => sym::anon,
+            ty::BoundRegionKind::Named(_, name) => name,
+            ty::BoundRegionKind::ClosureEnv => sym::env,
         };
 
         if cfg!(debug_assertions) {
diff --git a/compiler/rustc_borrowck/src/universal_regions.rs b/compiler/rustc_borrowck/src/universal_regions.rs
index fa44ffcd17d..b63144f560f 100644
--- a/compiler/rustc_borrowck/src/universal_regions.rs
+++ b/compiler/rustc_borrowck/src/universal_regions.rs
@@ -696,14 +696,13 @@ fn compute_inputs_and_output(
                 let closure_sig = args.as_closure().sig();
                 let inputs_and_output = closure_sig.inputs_and_output();
                 let bound_vars = tcx.mk_bound_variable_kinds_from_iter(
-                    inputs_and_output
-                        .bound_vars()
-                        .iter()
-                        .chain(iter::once(ty::BoundVariableKind::Region(ty::BrEnv))),
+                    inputs_and_output.bound_vars().iter().chain(iter::once(
+                        ty::BoundVariableKind::Region(ty::BoundRegionKind::ClosureEnv),
+                    )),
                 );
                 let br = ty::BoundRegion {
                     var: ty::BoundVar::from_usize(bound_vars.len() - 1),
-                    kind: ty::BrEnv,
+                    kind: ty::BoundRegionKind::ClosureEnv,
                 };
                 let env_region = ty::Region::new_bound(tcx, ty::INNERMOST, br);
                 let closure_ty = tcx.closure_env_ty(
@@ -751,15 +750,13 @@ fn compute_inputs_and_output(
             DefiningTy::CoroutineClosure(def_id, args) => {
                 assert_eq!(self.mir_def.to_def_id(), def_id);
                 let closure_sig = args.as_coroutine_closure().coroutine_closure_sig();
-                let bound_vars = tcx.mk_bound_variable_kinds_from_iter(
-                    closure_sig
-                        .bound_vars()
-                        .iter()
-                        .chain(iter::once(ty::BoundVariableKind::Region(ty::BrEnv))),
-                );
+                let bound_vars =
+                    tcx.mk_bound_variable_kinds_from_iter(closure_sig.bound_vars().iter().chain(
+                        iter::once(ty::BoundVariableKind::Region(ty::BoundRegionKind::ClosureEnv)),
+                    ));
                 let br = ty::BoundRegion {
                     var: ty::BoundVar::from_usize(bound_vars.len() - 1),
-                    kind: ty::BrEnv,
+                    kind: ty::BoundRegionKind::ClosureEnv,
                 };
                 let env_region = ty::Region::new_bound(tcx, ty::INNERMOST, br);
                 let closure_kind = args.as_coroutine_closure().kind();
diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
index c62028616e1..77c324183c3 100644
--- a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
+++ b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
@@ -2244,7 +2244,7 @@ fn param_env_with_gat_bounds<'tcx>(
                     .into()
                 }
                 GenericParamDefKind::Lifetime => {
-                    let kind = ty::BoundRegionKind::BrNamed(param.def_id, param.name);
+                    let kind = ty::BoundRegionKind::Named(param.def_id, param.name);
                     let bound_var = ty::BoundVariableKind::Region(kind);
                     bound_vars.push(bound_var);
                     ty::Region::new_bound(tcx, ty::INNERMOST, ty::BoundRegion {
diff --git a/compiler/rustc_hir_analysis/src/check/intrinsic.rs b/compiler/rustc_hir_analysis/src/check/intrinsic.rs
index 680e12b02fc..1513ea7c9e8 100644
--- a/compiler/rustc_hir_analysis/src/check/intrinsic.rs
+++ b/compiler/rustc_hir_analysis/src/check/intrinsic.rs
@@ -178,19 +178,19 @@ pub fn check_intrinsic_type(
     let name_str = intrinsic_name.as_str();
 
     let bound_vars = tcx.mk_bound_variable_kinds(&[
-        ty::BoundVariableKind::Region(ty::BrAnon),
-        ty::BoundVariableKind::Region(ty::BrAnon),
-        ty::BoundVariableKind::Region(ty::BrEnv),
+        ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon),
+        ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon),
+        ty::BoundVariableKind::Region(ty::BoundRegionKind::ClosureEnv),
     ]);
     let mk_va_list_ty = |mutbl| {
         tcx.lang_items().va_list().map(|did| {
             let region = ty::Region::new_bound(tcx, ty::INNERMOST, ty::BoundRegion {
                 var: ty::BoundVar::ZERO,
-                kind: ty::BrAnon,
+                kind: ty::BoundRegionKind::Anon,
             });
             let env_region = ty::Region::new_bound(tcx, ty::INNERMOST, ty::BoundRegion {
                 var: ty::BoundVar::from_u32(2),
-                kind: ty::BrEnv,
+                kind: ty::BoundRegionKind::ClosureEnv,
             });
             let va_list_ty = tcx.type_of(did).instantiate(tcx, &[region.into()]);
             (Ty::new_ref(tcx, env_region, va_list_ty, mutbl), va_list_ty)
@@ -509,7 +509,8 @@ pub fn check_intrinsic_type(
                 );
                 let discriminant_def_id = assoc_items[0];
 
-                let br = ty::BoundRegion { var: ty::BoundVar::ZERO, kind: ty::BrAnon };
+                let br =
+                    ty::BoundRegion { var: ty::BoundVar::ZERO, kind: ty::BoundRegionKind::Anon };
                 (
                     1,
                     0,
@@ -573,10 +574,14 @@ pub fn check_intrinsic_type(
             }
 
             sym::raw_eq => {
-                let br = ty::BoundRegion { var: ty::BoundVar::ZERO, kind: ty::BrAnon };
+                let br =
+                    ty::BoundRegion { var: ty::BoundVar::ZERO, kind: ty::BoundRegionKind::Anon };
                 let param_ty_lhs =
                     Ty::new_imm_ref(tcx, ty::Region::new_bound(tcx, ty::INNERMOST, br), param(0));
-                let br = ty::BoundRegion { var: ty::BoundVar::from_u32(1), kind: ty::BrAnon };
+                let br = ty::BoundRegion {
+                    var: ty::BoundVar::from_u32(1),
+                    kind: ty::BoundRegionKind::Anon,
+                };
                 let param_ty_rhs =
                     Ty::new_imm_ref(tcx, ty::Region::new_bound(tcx, ty::INNERMOST, br), param(0));
                 (1, 0, vec![param_ty_lhs, param_ty_rhs], tcx.types.bool)
diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
index e89c7fc9cb7..63a0e7d31c3 100644
--- a/compiler/rustc_hir_analysis/src/collect.rs
+++ b/compiler/rustc_hir_analysis/src/collect.rs
@@ -634,7 +634,7 @@ fn get_new_lifetime_name<'tcx>(
         .collect_referenced_late_bound_regions(poly_trait_ref)
         .into_iter()
         .filter_map(|lt| {
-            if let ty::BoundRegionKind::BrNamed(_, name) = lt {
+            if let ty::BoundRegionKind::Named(_, name) = lt {
                 Some(name.as_str().to_string())
             } else {
                 None
diff --git a/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs b/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
index dc3ef9952f0..cc55f57c46c 100644
--- a/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
+++ b/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
@@ -322,7 +322,7 @@ fn late_arg_as_bound_arg<'tcx>(
     let name = tcx.item_name(def_id);
     match param.kind {
         GenericParamKind::Lifetime { .. } => {
-            ty::BoundVariableKind::Region(ty::BrNamed(def_id, name))
+            ty::BoundVariableKind::Region(ty::BoundRegionKind::Named(def_id, name))
         }
         GenericParamKind::Type { .. } => {
             ty::BoundVariableKind::Ty(ty::BoundTyKind::Param(def_id, name))
@@ -337,7 +337,7 @@ fn late_arg_as_bound_arg<'tcx>(
 fn generic_param_def_as_bound_arg(param: &ty::GenericParamDef) -> ty::BoundVariableKind {
     match param.kind {
         ty::GenericParamDefKind::Lifetime => {
-            ty::BoundVariableKind::Region(ty::BoundRegionKind::BrNamed(param.def_id, param.name))
+            ty::BoundVariableKind::Region(ty::BoundRegionKind::Named(param.def_id, param.name))
         }
         ty::GenericParamDefKind::Type { .. } => {
             ty::BoundVariableKind::Ty(ty::BoundTyKind::Param(param.def_id, param.name))
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
index 85ba88333f9..1cade402c54 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
@@ -644,7 +644,7 @@ fn lower_return_type_notation_ty(
                 ty::GenericParamDefKind::Lifetime => {
                     ty::Region::new_bound(tcx, ty::INNERMOST, ty::BoundRegion {
                         var: ty::BoundVar::from_usize(num_bound_vars),
-                        kind: ty::BoundRegionKind::BrNamed(param.def_id, param.name),
+                        kind: ty::BoundRegionKind::Named(param.def_id, param.name),
                     })
                     .into()
                 }
@@ -830,8 +830,8 @@ fn visit_region(&mut self, re: ty::Region<'tcx>) -> Self::Result {
             }
             ty::ReBound(db, br) if db >= self.depth => {
                 self.vars.insert(match br.kind {
-                    ty::BrNamed(def_id, name) => (def_id, name),
-                    ty::BrAnon | ty::BrEnv => {
+                    ty::BoundRegionKind::Named(def_id, name) => (def_id, name),
+                    ty::BoundRegionKind::Anon | ty::BoundRegionKind::ClosureEnv => {
                         let guar = self
                             .cx
                             .dcx()
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
index d6534dbc694..ed39708981b 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
@@ -314,7 +314,7 @@ pub fn lower_resolved_lifetime(&self, resolved: rbv::ResolvedArg) -> ty::Region<
                 let name = lifetime_name(def_id);
                 let br = ty::BoundRegion {
                     var: ty::BoundVar::from_u32(index),
-                    kind: ty::BrNamed(def_id.to_def_id(), name),
+                    kind: ty::BoundRegionKind::Named(def_id.to_def_id(), name),
                 };
                 ty::Region::new_bound(tcx, debruijn, br)
             }
@@ -332,7 +332,7 @@ pub fn lower_resolved_lifetime(&self, resolved: rbv::ResolvedArg) -> ty::Region<
                 ty::Region::new_late_param(
                     tcx,
                     scope.to_def_id(),
-                    ty::BrNamed(id.to_def_id(), name),
+                    ty::BoundRegionKind::Named(id.to_def_id(), name),
                 )
 
                 // (*) -- not late-bound, won't change
@@ -2449,15 +2449,17 @@ fn validate_late_bound_regions<'cx>(
     ) {
         for br in referenced_regions.difference(&constrained_regions) {
             let br_name = match *br {
-                ty::BrNamed(_, kw::UnderscoreLifetime) | ty::BrAnon | ty::BrEnv => {
-                    "an anonymous lifetime".to_string()
-                }
-                ty::BrNamed(_, name) => format!("lifetime `{name}`"),
+                ty::BoundRegionKind::Named(_, kw::UnderscoreLifetime)
+                | ty::BoundRegionKind::Anon
+                | ty::BoundRegionKind::ClosureEnv => "an anonymous lifetime".to_string(),
+                ty::BoundRegionKind::Named(_, name) => format!("lifetime `{name}`"),
             };
 
             let mut err = generate_err(&br_name);
 
-            if let ty::BrNamed(_, kw::UnderscoreLifetime) | ty::BrAnon = *br {
+            if let ty::BoundRegionKind::Named(_, kw::UnderscoreLifetime)
+            | ty::BoundRegionKind::Anon = *br
+            {
                 // The only way for an anonymous lifetime to wind up
                 // in the return type but **also** be unconstrained is
                 // if it only appears in "associated types" in the
diff --git a/compiler/rustc_hir_typeck/src/check.rs b/compiler/rustc_hir_typeck/src/check.rs
index a49deaa2678..2026fd9a614 100644
--- a/compiler/rustc_hir_typeck/src/check.rs
+++ b/compiler/rustc_hir_typeck/src/check.rs
@@ -194,21 +194,21 @@ fn check_panic_info_fn(tcx: TyCtxt<'_>, fn_id: LocalDefId, fn_sig: ty::FnSig<'_>
     let panic_info_ty = tcx.type_of(panic_info_did).instantiate(tcx, &[ty::GenericArg::from(
         ty::Region::new_bound(tcx, ty::INNERMOST, ty::BoundRegion {
             var: ty::BoundVar::from_u32(1),
-            kind: ty::BrAnon,
+            kind: ty::BoundRegionKind::Anon,
         }),
     )]);
     let panic_info_ref_ty = Ty::new_imm_ref(
         tcx,
         ty::Region::new_bound(tcx, ty::INNERMOST, ty::BoundRegion {
             var: ty::BoundVar::ZERO,
-            kind: ty::BrAnon,
+            kind: ty::BoundRegionKind::Anon,
         }),
         panic_info_ty,
     );
 
     let bounds = tcx.mk_bound_variable_kinds(&[
-        ty::BoundVariableKind::Region(ty::BrAnon),
-        ty::BoundVariableKind::Region(ty::BrAnon),
+        ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon),
+        ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon),
     ]);
     let expected_sig = ty::Binder::bind_with_vars(
         tcx.mk_fn_sig([panic_info_ref_ty], tcx.types.never, false, fn_sig.safety, ExternAbi::Rust),
diff --git a/compiler/rustc_hir_typeck/src/upvar.rs b/compiler/rustc_hir_typeck/src/upvar.rs
index 2d5e8fdd720..175fca327f3 100644
--- a/compiler/rustc_hir_typeck/src/upvar.rs
+++ b/compiler/rustc_hir_typeck/src/upvar.rs
@@ -381,7 +381,7 @@ fn analyze_closure(
             let closure_env_region: ty::Region<'_> =
                 ty::Region::new_bound(self.tcx, ty::INNERMOST, ty::BoundRegion {
                     var: ty::BoundVar::ZERO,
-                    kind: ty::BoundRegionKind::BrEnv,
+                    kind: ty::BoundRegionKind::ClosureEnv,
                 });
 
             let num_args = args
@@ -441,7 +441,7 @@ fn analyze_closure(
                         rustc_abi::ExternAbi::Rust,
                     ),
                     self.tcx.mk_bound_variable_kinds(&[ty::BoundVariableKind::Region(
-                        ty::BoundRegionKind::BrEnv,
+                        ty::BoundRegionKind::ClosureEnv,
                     )]),
                 ),
             );
diff --git a/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs b/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs
index c9d8ebecef0..f87c43a0ecd 100644
--- a/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs
+++ b/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs
@@ -753,7 +753,7 @@ fn canonical_var_for_region(
         r: ty::Region<'tcx>,
     ) -> ty::Region<'tcx> {
         let var = self.canonical_var(info, r.into());
-        let br = ty::BoundRegion { var, kind: ty::BrAnon };
+        let br = ty::BoundRegion { var, kind: ty::BoundRegionKind::Anon };
         ty::Region::new_bound(self.cx(), self.binder_index, br)
     }
 
diff --git a/compiler/rustc_lint/src/impl_trait_overcaptures.rs b/compiler/rustc_lint/src/impl_trait_overcaptures.rs
index 026826021c8..002ab027982 100644
--- a/compiler/rustc_lint/src/impl_trait_overcaptures.rs
+++ b/compiler/rustc_lint/src/impl_trait_overcaptures.rs
@@ -154,7 +154,7 @@ fn check_fn(tcx: TyCtxt<'_>, parent_def_id: LocalDefId) {
     }
 
     for bound_var in sig.bound_vars() {
-        let ty::BoundVariableKind::Region(ty::BoundRegionKind::BrNamed(def_id, name)) = bound_var
+        let ty::BoundVariableKind::Region(ty::BoundRegionKind::Named(def_id, name)) = bound_var
         else {
             span_bug!(tcx.def_span(parent_def_id), "unexpected non-lifetime binder on fn sig");
         };
@@ -215,7 +215,7 @@ fn visit_binder<T: TypeVisitable<TyCtxt<'tcx>>>(&mut self, t: &ty::Binder<'tcx,
         for arg in t.bound_vars() {
             let arg: ty::BoundVariableKind = arg;
             match arg {
-                ty::BoundVariableKind::Region(ty::BoundRegionKind::BrNamed(def_id, ..))
+                ty::BoundVariableKind::Region(ty::BoundRegionKind::Named(def_id, ..))
                 | ty::BoundVariableKind::Ty(ty::BoundTyKind::Param(def_id, _)) => {
                     added.push(def_id);
                     let unique = self.in_scope_parameters.insert(def_id, ParamKind::Late);
@@ -318,7 +318,7 @@ fn visit_ty(&mut self, t: Ty<'tcx>) {
                         ParamKind::Free(def_id, name) => ty::Region::new_late_param(
                             self.tcx,
                             self.parent_def_id.to_def_id(),
-                            ty::BoundRegionKind::BrNamed(def_id, name),
+                            ty::BoundRegionKind::Named(def_id, name),
                         ),
                         // Totally ignore late bound args from binders.
                         ParamKind::Late => return true,
@@ -489,11 +489,11 @@ fn extract_def_id_from_arg<'tcx>(
             ty::ReEarlyParam(ebr) => generics.region_param(ebr, tcx).def_id,
             ty::ReBound(
                 _,
-                ty::BoundRegion { kind: ty::BoundRegionKind::BrNamed(def_id, ..), .. },
+                ty::BoundRegion { kind: ty::BoundRegionKind::Named(def_id, ..), .. },
             )
             | ty::ReLateParam(ty::LateParamRegion {
                 scope: _,
-                bound_region: ty::BoundRegionKind::BrNamed(def_id, ..),
+                bound_region: ty::BoundRegionKind::Named(def_id, ..),
             }) => def_id,
             _ => unreachable!(),
         },
@@ -558,11 +558,11 @@ fn regions(
             ty::ReEarlyParam(ebr) => self.generics.region_param(ebr, self.tcx).def_id,
             ty::ReBound(
                 _,
-                ty::BoundRegion { kind: ty::BoundRegionKind::BrNamed(def_id, ..), .. },
+                ty::BoundRegion { kind: ty::BoundRegionKind::Named(def_id, ..), .. },
             )
             | ty::ReLateParam(ty::LateParamRegion {
                 scope: _,
-                bound_region: ty::BoundRegionKind::BrNamed(def_id, ..),
+                bound_region: ty::BoundRegionKind::Named(def_id, ..),
             }) => def_id,
             _ => {
                 return Ok(a);
diff --git a/compiler/rustc_middle/src/mir/query.rs b/compiler/rustc_middle/src/mir/query.rs
index c34bdf041af..86abeb50382 100644
--- a/compiler/rustc_middle/src/mir/query.rs
+++ b/compiler/rustc_middle/src/mir/query.rs
@@ -317,7 +317,10 @@ impl<'tcx> ClosureOutlivesSubjectTy<'tcx> {
     pub fn bind(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Self {
         let inner = tcx.fold_regions(ty, |r, depth| match r.kind() {
             ty::ReVar(vid) => {
-                let br = ty::BoundRegion { var: ty::BoundVar::new(vid.index()), kind: ty::BrAnon };
+                let br = ty::BoundRegion {
+                    var: ty::BoundVar::new(vid.index()),
+                    kind: ty::BoundRegionKind::Anon,
+                };
                 ty::Region::new_bound(tcx, depth, br)
             }
             _ => bug!("unexpected region in ClosureOutlivesSubjectTy: {r:?}"),
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 59c7b51ae68..c55733da7b3 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -1059,7 +1059,7 @@ fn new(interners: &CtxtInterners<'tcx>) -> CommonLifetimes<'tcx> {
                     .map(|v| {
                         mk(ty::ReBound(ty::DebruijnIndex::from(i), ty::BoundRegion {
                             var: ty::BoundVar::from(v),
-                            kind: ty::BrAnon,
+                            kind: ty::BoundRegionKind::Anon,
                         }))
                     })
                     .collect()
@@ -1982,7 +1982,10 @@ pub fn is_suitable_region(
                 region = self.map_opaque_lifetime_to_parent_lifetime(def_id);
                 continue;
             }
-            break (scope, ty::BrNamed(def_id.into(), self.item_name(def_id.into())));
+            break (
+                scope,
+                ty::BoundRegionKind::Named(def_id.into(), self.item_name(def_id.into())),
+            );
         };
 
         let is_impl_item = match self.hir_node_by_def_id(suitable_region_binding_scope) {
@@ -3091,7 +3094,7 @@ pub fn map_opaque_lifetime_to_parent_lifetime(
                     return ty::Region::new_late_param(
                         self,
                         new_parent.to_def_id(),
-                        ty::BoundRegionKind::BrNamed(
+                        ty::BoundRegionKind::Named(
                             lbv.to_def_id(),
                             self.item_name(lbv.to_def_id()),
                         ),
diff --git a/compiler/rustc_middle/src/ty/fold.rs b/compiler/rustc_middle/src/ty/fold.rs
index b5a77b3c942..7adbd556141 100644
--- a/compiler/rustc_middle/src/ty/fold.rs
+++ b/compiler/rustc_middle/src/ty/fold.rs
@@ -399,7 +399,7 @@ fn replace_region(&mut self, br: ty::BoundRegion) -> ty::Region<'tcx> {
                 let index = entry.index();
                 let var = ty::BoundVar::from_usize(index);
                 let kind = entry
-                    .or_insert_with(|| ty::BoundVariableKind::Region(ty::BrAnon))
+                    .or_insert_with(|| ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon))
                     .expect_region();
                 let br = ty::BoundRegion { var, kind };
                 ty::Region::new_bound(self.tcx, ty::INNERMOST, br)
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index ce02d0f308e..6d9ba3d60e3 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -84,7 +84,6 @@
     RegionOutlivesPredicate, SubtypePredicate, ToPolyTraitRef, TraitPredicate, TraitRef,
     TypeOutlivesPredicate,
 };
-pub use self::region::BoundRegionKind::*;
 pub use self::region::{
     BoundRegion, BoundRegionKind, EarlyParamRegion, LateParamRegion, Region, RegionKind, RegionVid,
 };
@@ -895,7 +894,7 @@ fn with_updated_universe(self, ui: UniverseIndex) -> Self {
     }
 
     fn new(ui: UniverseIndex, var: BoundVar) -> Self {
-        Placeholder { universe: ui, bound: BoundRegion { var, kind: BoundRegionKind::BrAnon } }
+        Placeholder { universe: ui, bound: BoundRegion { var, kind: BoundRegionKind::Anon } }
     }
 }
 
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index d8725cb6ba0..039c988f5c9 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -2483,7 +2483,7 @@ pub fn pretty_print_region(&mut self, region: ty::Region<'tcx>) -> Result<(), fm
             | ty::RePlaceholder(ty::Placeholder {
                 bound: ty::BoundRegion { kind: br, .. }, ..
             }) => {
-                if let ty::BrNamed(_, name) = br
+                if let ty::BoundRegionKind::Named(_, name) = br
                     && br.is_named()
                 {
                     p!(write("{}", name));
@@ -2569,7 +2569,7 @@ fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
                 // If this is an anonymous placeholder, don't rename. Otherwise, in some
                 // async fns, we get a `for<'r> Send` bound
                 match kind {
-                    ty::BrAnon | ty::BrEnv => r,
+                    ty::BoundRegionKind::Anon | ty::BoundRegionKind::ClosureEnv => r,
                     _ => {
                         // Index doesn't matter, since this is just for naming and these never get bound
                         let br = ty::BoundRegion { var: ty::BoundVar::ZERO, kind };
@@ -2688,12 +2688,13 @@ fn name_by_region_index(
                             binder_level_idx: ty::DebruijnIndex,
                             br: ty::BoundRegion| {
                 let (name, kind) = match br.kind {
-                    ty::BrAnon | ty::BrEnv => {
+                    ty::BoundRegionKind::Anon | ty::BoundRegionKind::ClosureEnv => {
                         let name = next_name(self);
 
                         if let Some(lt_idx) = lifetime_idx {
                             if lt_idx > binder_level_idx {
-                                let kind = ty::BrNamed(CRATE_DEF_ID.to_def_id(), name);
+                                let kind =
+                                    ty::BoundRegionKind::Named(CRATE_DEF_ID.to_def_id(), name);
                                 return ty::Region::new_bound(
                                     tcx,
                                     ty::INNERMOST,
@@ -2702,14 +2703,14 @@ fn name_by_region_index(
                             }
                         }
 
-                        (name, ty::BrNamed(CRATE_DEF_ID.to_def_id(), name))
+                        (name, ty::BoundRegionKind::Named(CRATE_DEF_ID.to_def_id(), name))
                     }
-                    ty::BrNamed(def_id, kw::UnderscoreLifetime | kw::Empty) => {
+                    ty::BoundRegionKind::Named(def_id, kw::UnderscoreLifetime | kw::Empty) => {
                         let name = next_name(self);
 
                         if let Some(lt_idx) = lifetime_idx {
                             if lt_idx > binder_level_idx {
-                                let kind = ty::BrNamed(def_id, name);
+                                let kind = ty::BoundRegionKind::Named(def_id, name);
                                 return ty::Region::new_bound(
                                     tcx,
                                     ty::INNERMOST,
@@ -2718,9 +2719,9 @@ fn name_by_region_index(
                             }
                         }
 
-                        (name, ty::BrNamed(def_id, name))
+                        (name, ty::BoundRegionKind::Named(def_id, name))
                     }
-                    ty::BrNamed(_, name) => {
+                    ty::BoundRegionKind::Named(_, name) => {
                         if let Some(lt_idx) = lifetime_idx {
                             if lt_idx > binder_level_idx {
                                 let kind = br.kind;
diff --git a/compiler/rustc_middle/src/ty/region.rs b/compiler/rustc_middle/src/ty/region.rs
index be4772e888f..60c2c322d4f 100644
--- a/compiler/rustc_middle/src/ty/region.rs
+++ b/compiler/rustc_middle/src/ty/region.rs
@@ -56,7 +56,7 @@ pub fn new_bound(
         bound_region: ty::BoundRegion,
     ) -> Region<'tcx> {
         // Use a pre-interned one when possible.
-        if let ty::BoundRegion { var, kind: ty::BrAnon } = bound_region
+        if let ty::BoundRegion { var, kind: ty::BoundRegionKind::Anon } = bound_region
             && let Some(inner) = tcx.lifetimes.re_late_bounds.get(debruijn.as_usize())
             && let Some(re) = inner.get(var.as_usize()).copied()
         {
@@ -147,7 +147,7 @@ fn new_bound(
     }
 
     fn new_anon_bound(tcx: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self {
-        Region::new_bound(tcx, debruijn, ty::BoundRegion { var, kind: ty::BoundRegionKind::BrAnon })
+        Region::new_bound(tcx, debruijn, ty::BoundRegion { var, kind: ty::BoundRegionKind::Anon })
     }
 
     fn new_static(tcx: TyCtxt<'tcx>) -> Self {
@@ -311,7 +311,7 @@ pub fn opt_param_def_id(self, tcx: TyCtxt<'tcx>, binding_item: DefId) -> Option<
                 Some(tcx.generics_of(binding_item).region_param(ebr, tcx).def_id)
             }
             ty::ReLateParam(ty::LateParamRegion {
-                bound_region: ty::BoundRegionKind::BrNamed(def_id, _),
+                bound_region: ty::BoundRegionKind::Named(def_id, _),
                 ..
             }) => Some(def_id),
             _ => None,
@@ -355,7 +355,7 @@ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 /// Similar to a placeholder region as we create `LateParam` regions when entering a binder
 /// except they are always in the root universe and instead of using a boundvar to distinguish
 /// between others we use the `DefId` of the parameter. For this reason the `bound_region` field
-/// should basically always be `BoundRegionKind::BrNamed` as otherwise there is no way of telling
+/// should basically always be `BoundRegionKind::Named` as otherwise there is no way of telling
 /// different parameters apart.
 pub struct LateParamRegion {
     pub scope: DefId,
@@ -366,17 +366,17 @@ pub struct LateParamRegion {
 #[derive(HashStable)]
 pub enum BoundRegionKind {
     /// An anonymous region parameter for a given fn (&T)
-    BrAnon,
+    Anon,
 
     /// Named region parameters for functions (a in &'a T)
     ///
     /// The `DefId` is needed to distinguish free regions in
     /// the event of shadowing.
-    BrNamed(DefId, Symbol),
+    Named(DefId, Symbol),
 
     /// Anonymous region for the implicit env pointer parameter
     /// to a closure
-    BrEnv,
+    ClosureEnv,
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
@@ -399,9 +399,9 @@ fn assert_eq(self, var: ty::BoundVariableKind) {
 impl core::fmt::Debug for BoundRegion {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self.kind {
-            BoundRegionKind::BrAnon => write!(f, "{:?}", self.var),
-            BoundRegionKind::BrEnv => write!(f, "{:?}.Env", self.var),
-            BoundRegionKind::BrNamed(def, symbol) => {
+            BoundRegionKind::Anon => write!(f, "{:?}", self.var),
+            BoundRegionKind::ClosureEnv => write!(f, "{:?}.Env", self.var),
+            BoundRegionKind::Named(def, symbol) => {
                 write!(f, "{:?}.Named({:?}, {:?})", self.var, def, symbol)
             }
         }
@@ -411,9 +411,7 @@ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 impl BoundRegionKind {
     pub fn is_named(&self) -> bool {
         match *self {
-            BoundRegionKind::BrNamed(_, name) => {
-                name != kw::UnderscoreLifetime && name != kw::Empty
-            }
+            BoundRegionKind::Named(_, name) => name != kw::UnderscoreLifetime && name != kw::Empty,
             _ => false,
         }
     }
@@ -421,7 +419,7 @@ pub fn is_named(&self) -> bool {
     pub fn get_name(&self) -> Option<Symbol> {
         if self.is_named() {
             match *self {
-                BoundRegionKind::BrNamed(_, name) => return Some(name),
+                BoundRegionKind::Named(_, name) => return Some(name),
                 _ => unreachable!(),
             }
         }
@@ -431,7 +429,7 @@ pub fn get_name(&self) -> Option<Symbol> {
 
     pub fn get_id(&self) -> Option<DefId> {
         match *self {
-            BoundRegionKind::BrNamed(id, _) => Some(id),
+            BoundRegionKind::Named(id, _) => Some(id),
             _ => None,
         }
     }
diff --git a/compiler/rustc_middle/src/ty/structural_impls.rs b/compiler/rustc_middle/src/ty/structural_impls.rs
index 3268dabd165..e48fac6c7e8 100644
--- a/compiler/rustc_middle/src/ty/structural_impls.rs
+++ b/compiler/rustc_middle/src/ty/structural_impls.rs
@@ -62,15 +62,15 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 impl fmt::Debug for ty::BoundRegionKind {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {
-            ty::BrAnon => write!(f, "BrAnon"),
-            ty::BrNamed(did, name) => {
+            ty::BoundRegionKind::Anon => write!(f, "BrAnon"),
+            ty::BoundRegionKind::Named(did, name) => {
                 if did.is_crate_root() {
                     write!(f, "BrNamed({name})")
                 } else {
                     write!(f, "BrNamed({did:?}, {name})")
                 }
             }
-            ty::BrEnv => write!(f, "BrEnv"),
+            ty::BoundRegionKind::ClosureEnv => write!(f, "BrEnv"),
         }
     }
 }
diff --git a/compiler/rustc_middle/src/ty/util.rs b/compiler/rustc_middle/src/ty/util.rs
index 83276808a28..d6fd2b6b287 100644
--- a/compiler/rustc_middle/src/ty/util.rs
+++ b/compiler/rustc_middle/src/ty/util.rs
@@ -735,8 +735,11 @@ pub fn bound_coroutine_hidden_types(
                 let ty = self.fold_regions(decl.ty, |re, debruijn| {
                     assert_eq!(re, self.lifetimes.re_erased);
                     let var = ty::BoundVar::from_usize(vars.len());
-                    vars.push(ty::BoundVariableKind::Region(ty::BrAnon));
-                    ty::Region::new_bound(self, debruijn, ty::BoundRegion { var, kind: ty::BrAnon })
+                    vars.push(ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon));
+                    ty::Region::new_bound(self, debruijn, ty::BoundRegion {
+                        var,
+                        kind: ty::BoundRegionKind::Anon,
+                    })
                 });
                 ty::EarlyBinder::bind(ty::Binder::bind_with_vars(
                     ty,
diff --git a/compiler/rustc_smir/src/rustc_internal/internal.rs b/compiler/rustc_smir/src/rustc_internal/internal.rs
index 655553de864..dec2a77619b 100644
--- a/compiler/rustc_smir/src/rustc_internal/internal.rs
+++ b/compiler/rustc_smir/src/rustc_internal/internal.rs
@@ -335,12 +335,12 @@ fn internal<'tcx>(&self, tables: &mut Tables<'_>, tcx: TyCtxt<'tcx>) -> Self::T<
                 ),
             }),
             BoundVariableKind::Region(kind) => rustc_ty::BoundVariableKind::Region(match kind {
-                BoundRegionKind::BrAnon => rustc_ty::BoundRegionKind::BrAnon,
-                BoundRegionKind::BrNamed(def, symbol) => rustc_ty::BoundRegionKind::BrNamed(
+                BoundRegionKind::BrAnon => rustc_ty::BoundRegionKind::Anon,
+                BoundRegionKind::BrNamed(def, symbol) => rustc_ty::BoundRegionKind::Named(
                     def.0.internal(tables, tcx),
                     Symbol::intern(symbol),
                 ),
-                BoundRegionKind::BrEnv => rustc_ty::BoundRegionKind::BrEnv,
+                BoundRegionKind::BrEnv => rustc_ty::BoundRegionKind::ClosureEnv,
             }),
             BoundVariableKind::Const => rustc_ty::BoundVariableKind::Const,
         }
diff --git a/compiler/rustc_smir/src/rustc_smir/convert/ty.rs b/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
index 62c762dfb9b..a4f61313001 100644
--- a/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
+++ b/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
@@ -243,11 +243,11 @@ fn stable(&self, tables: &mut Tables<'_>) -> Self::T {
         use stable_mir::ty::BoundRegionKind;
 
         match self {
-            ty::BoundRegionKind::BrAnon => BoundRegionKind::BrAnon,
-            ty::BoundRegionKind::BrNamed(def_id, symbol) => {
+            ty::BoundRegionKind::Anon => BoundRegionKind::BrAnon,
+            ty::BoundRegionKind::Named(def_id, symbol) => {
                 BoundRegionKind::BrNamed(tables.br_named_def(*def_id), symbol.to_string())
             }
-            ty::BoundRegionKind::BrEnv => BoundRegionKind::BrEnv,
+            ty::BoundRegionKind::ClosureEnv => BoundRegionKind::BrEnv,
         }
     }
 }
diff --git a/compiler/rustc_symbol_mangling/src/v0.rs b/compiler/rustc_symbol_mangling/src/v0.rs
index 7c10e72ff23..05b4ff327a9 100644
--- a/compiler/rustc_symbol_mangling/src/v0.rs
+++ b/compiler/rustc_symbol_mangling/src/v0.rs
@@ -290,7 +290,7 @@ fn print_region(&mut self, region: ty::Region<'_>) -> Result<(), PrintError> {
 
             // Bound lifetimes use indices starting at 1,
             // see `BinderLevel` for more details.
-            ty::ReBound(debruijn, ty::BoundRegion { var, kind: ty::BrAnon }) => {
+            ty::ReBound(debruijn, ty::BoundRegion { var, kind: ty::BoundRegionKind::Anon }) => {
                 let binder = &self.binders[self.binders.len() - 1 - debruijn.index()];
                 let depth = binder.lifetime_depths.start + var.as_u32();
 
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/find_anon_type.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/find_anon_type.rs
index 2ecd28f4868..cd621fd1a39 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/find_anon_type.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/find_anon_type.rs
@@ -100,7 +100,10 @@ fn visit_ty(&mut self, arg: &'tcx hir::Ty<'tcx>) -> Self::Result {
                     // Find the index of the named region that was part of the
                     // error. We will then search the function parameters for a bound
                     // region at the right depth with the same index
-                    (Some(rbv::ResolvedArg::EarlyBound(id)), ty::BrNamed(def_id, _)) => {
+                    (
+                        Some(rbv::ResolvedArg::EarlyBound(id)),
+                        ty::BoundRegionKind::Named(def_id, _),
+                    ) => {
                         debug!("EarlyBound id={:?} def_id={:?}", id, def_id);
                         if id.to_def_id() == def_id {
                             return ControlFlow::Break(arg);
@@ -112,7 +115,7 @@ fn visit_ty(&mut self, arg: &'tcx hir::Ty<'tcx>) -> Self::Result {
                     // region at the right depth with the same index
                     (
                         Some(rbv::ResolvedArg::LateBound(debruijn_index, _, id)),
-                        ty::BrNamed(def_id, _),
+                        ty::BoundRegionKind::Named(def_id, _),
                     ) => {
                         debug!(
                             "FindNestedTypeVisitor::visit_ty: LateBound depth = {:?}",
@@ -191,14 +194,17 @@ fn nested_visit_map(&mut self) -> Map<'tcx> {
     fn visit_lifetime(&mut self, lifetime: &hir::Lifetime) -> Self::Result {
         match (self.tcx.named_bound_var(lifetime.hir_id), self.bound_region) {
             // the lifetime of the TyPath!
-            (Some(rbv::ResolvedArg::EarlyBound(id)), ty::BrNamed(def_id, _)) => {
+            (Some(rbv::ResolvedArg::EarlyBound(id)), ty::BoundRegionKind::Named(def_id, _)) => {
                 debug!("EarlyBound id={:?} def_id={:?}", id, def_id);
                 if id.to_def_id() == def_id {
                     return ControlFlow::Break(());
                 }
             }
 
-            (Some(rbv::ResolvedArg::LateBound(debruijn_index, _, id)), ty::BrNamed(def_id, _)) => {
+            (
+                Some(rbv::ResolvedArg::LateBound(debruijn_index, _, id)),
+                ty::BoundRegionKind::Named(def_id, _),
+            ) => {
                 debug!("FindNestedTypeVisitor::visit_ty: LateBound depth = {:?}", debruijn_index,);
                 debug!("id={:?}", id);
                 debug!("def_id={:?}", def_id);
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/named_anon_conflict.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/named_anon_conflict.rs
index 7cf98183774..9fa5a8ac637 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/named_anon_conflict.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/named_anon_conflict.rs
@@ -60,7 +60,7 @@ pub(super) fn try_report_named_anon_conflict(&self) -> Option<Diag<'tcx>> {
         let is_impl_item = region_info.is_impl_item;
 
         match br {
-            ty::BrNamed(_, kw::UnderscoreLifetime) | ty::BrAnon => {}
+            ty::BoundRegionKind::Named(_, kw::UnderscoreLifetime) | ty::BoundRegionKind::Anon => {}
             _ => {
                 /* not an anonymous region */
                 debug!("try_report_named_anon_conflict: not an anonymous region");
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/placeholder_relation.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/placeholder_relation.rs
index f2a7da707b8..7fcd3c847e3 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/placeholder_relation.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/placeholder_relation.rs
@@ -29,16 +29,16 @@ pub(super) fn try_report_placeholder_relation(&self) -> Option<Diag<'tcx>> {
             )) => {
                 let span = *span;
                 let (sub_span, sub_symbol) = match sub_name {
-                    ty::BrNamed(def_id, symbol) => {
+                    ty::BoundRegionKind::Named(def_id, symbol) => {
                         (Some(self.tcx().def_span(def_id)), Some(symbol))
                     }
-                    ty::BrAnon | ty::BrEnv => (None, None),
+                    ty::BoundRegionKind::Anon | ty::BoundRegionKind::ClosureEnv => (None, None),
                 };
                 let (sup_span, sup_symbol) = match sup_name {
-                    ty::BrNamed(def_id, symbol) => {
+                    ty::BoundRegionKind::Named(def_id, symbol) => {
                         (Some(self.tcx().def_span(def_id)), Some(symbol))
                     }
-                    ty::BrAnon | ty::BrEnv => (None, None),
+                    ty::BoundRegionKind::Anon | ty::BoundRegionKind::ClosureEnv => (None, None),
                 };
                 let diag = match (sub_span, sup_span, sub_symbol, sup_symbol) {
                     (Some(sub_span), Some(sup_span), Some(&sub_symbol), Some(&sup_symbol)) => {
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/util.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/util.rs
index 90b354305ff..75054b22153 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/util.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/util.rs
@@ -46,7 +46,7 @@ pub fn find_param_with_region<'tcx>(
         ty::ReLateParam(late_param) => (late_param.scope, late_param.bound_region),
         ty::ReEarlyParam(ebr) => {
             let region_def = tcx.generics_of(generic_param_scope).region_param(ebr, tcx).def_id;
-            (tcx.parent(region_def), ty::BoundRegionKind::BrNamed(region_def, ebr.name))
+            (tcx.parent(region_def), ty::BoundRegionKind::Named(region_def, ebr.name))
         }
         _ => return None, // not a free region
     };
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
index 438639e72f9..9fd7dccc57c 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
@@ -993,7 +993,7 @@ fn report_sub_sup_conflict(
     fn report_inference_failure(&self, var_origin: RegionVariableOrigin) -> Diag<'_> {
         let br_string = |br: ty::BoundRegionKind| {
             let mut s = match br {
-                ty::BrNamed(_, name) => name.to_string(),
+                ty::BoundRegionKind::Named(_, name) => name.to_string(),
                 _ => String::new(),
             };
             if !s.is_empty() {
@@ -1103,7 +1103,7 @@ fn msg_span_from_named_region<'tcx>(
                 ("the anonymous lifetime defined here".to_string(), Some(ty.span))
             } else {
                 match fr.bound_region {
-                    ty::BoundRegionKind::BrNamed(param_def_id, name) => {
+                    ty::BoundRegionKind::Named(param_def_id, name) => {
                         let span = tcx.def_span(param_def_id);
                         let text = if name == kw::UnderscoreLifetime {
                             "the anonymous lifetime as defined here".to_string()
@@ -1112,7 +1112,7 @@ fn msg_span_from_named_region<'tcx>(
                         };
                         (text, Some(span))
                     }
-                    ty::BrAnon => (
+                    ty::BoundRegionKind::Anon => (
                         "the anonymous lifetime as defined here".to_string(),
                         Some(tcx.def_span(generic_param_scope)),
                     ),
@@ -1125,11 +1125,11 @@ fn msg_span_from_named_region<'tcx>(
         }
         ty::ReStatic => ("the static lifetime".to_owned(), alt_span),
         ty::RePlaceholder(ty::PlaceholderRegion {
-            bound: ty::BoundRegion { kind: ty::BoundRegionKind::BrNamed(def_id, name), .. },
+            bound: ty::BoundRegion { kind: ty::BoundRegionKind::Named(def_id, name), .. },
             ..
         }) => (format!("the lifetime `{name}` as defined here"), Some(tcx.def_span(def_id))),
         ty::RePlaceholder(ty::PlaceholderRegion {
-            bound: ty::BoundRegion { kind: ty::BoundRegionKind::BrAnon, .. },
+            bound: ty::BoundRegion { kind: ty::BoundRegionKind::Anon, .. },
             ..
         }) => ("an anonymous lifetime".to_owned(), None),
         _ => bug!("{:?}", region),
diff --git a/compiler/rustc_trait_selection/src/errors/note_and_explain.rs b/compiler/rustc_trait_selection/src/errors/note_and_explain.rs
index 67463b9884c..cc0a637a78e 100644
--- a/compiler/rustc_trait_selection/src/errors/note_and_explain.rs
+++ b/compiler/rustc_trait_selection/src/errors/note_and_explain.rs
@@ -48,7 +48,7 @@ fn new<'tcx>(
                 } else {
                     let scope = fr.scope.expect_local();
                     match fr.bound_region {
-                        ty::BoundRegionKind::BrNamed(_, name) => {
+                        ty::BoundRegionKind::Named(_, name) => {
                             let span = if let Some(param) = tcx
                                 .hir()
                                 .get_generics(scope)
@@ -64,7 +64,7 @@ fn new<'tcx>(
                                 (Some(span), "as_defined", name.to_string())
                             }
                         }
-                        ty::BrAnon => {
+                        ty::BoundRegionKind::Anon => {
                             let span = Some(tcx.def_span(scope));
                             (span, "defined_here", String::new())
                         }
diff --git a/compiler/rustc_trait_selection/src/traits/coherence.rs b/compiler/rustc_trait_selection/src/traits/coherence.rs
index 3cd11d7c8e8..a98871b2d60 100644
--- a/compiler/rustc_trait_selection/src/traits/coherence.rs
+++ b/compiler/rustc_trait_selection/src/traits/coherence.rs
@@ -540,7 +540,7 @@ fn visit_region(&mut self, r: ty::Region<'tcx>) {
                                 universe: self.universe,
                                 bound: ty::BoundRegion {
                                     var: self.next_var(),
-                                    kind: ty::BoundRegionKind::BrAnon,
+                                    kind: ty::BoundRegionKind::Anon,
                                 },
                             }),
                         )
diff --git a/compiler/rustc_trait_selection/src/traits/select/confirmation.rs b/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
index e7d3004aa20..afa5abeadb5 100644
--- a/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
@@ -660,7 +660,7 @@ fn confirm_object_candidate(
                             .into()
                         }
                         GenericParamDefKind::Lifetime => {
-                            let kind = ty::BoundRegionKind::BrNamed(param.def_id, param.name);
+                            let kind = ty::BoundRegionKind::Named(param.def_id, param.name);
                             let bound_var = ty::BoundVariableKind::Region(kind);
                             bound_vars.push(bound_var);
                             ty::Region::new_bound(tcx, ty::INNERMOST, ty::BoundRegion {
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs
index ac9ac71f941..711480252ec 100644
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@@ -3183,7 +3183,7 @@ fn bind_coroutine_hidden_types_above<'tcx>(
                         ty::ReErased => {
                             let br = ty::BoundRegion {
                                 var: ty::BoundVar::from_u32(counter),
-                                kind: ty::BrAnon,
+                                kind: ty::BoundRegionKind::Anon,
                             };
                             counter += 1;
                             ty::Region::new_bound(tcx, current_depth, br)
@@ -3196,9 +3196,11 @@ fn bind_coroutine_hidden_types_above<'tcx>(
             bty.instantiate(tcx, args)
         })
         .collect();
-    let bound_vars =
-        tcx.mk_bound_variable_kinds_from_iter(bound_vars.iter().chain(
-            (num_bound_variables..counter).map(|_| ty::BoundVariableKind::Region(ty::BrAnon)),
-        ));
+    let bound_vars = tcx.mk_bound_variable_kinds_from_iter(
+        bound_vars.iter().chain(
+            (num_bound_variables..counter)
+                .map(|_| ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon)),
+        ),
+    );
     ty::Binder::bind_with_vars(hidden_types, bound_vars)
 }
diff --git a/compiler/rustc_ty_utils/src/abi.rs b/compiler/rustc_ty_utils/src/abi.rs
index 42b710687cf..0838978a891 100644
--- a/compiler/rustc_ty_utils/src/abi.rs
+++ b/compiler/rustc_ty_utils/src/abi.rs
@@ -76,12 +76,13 @@ fn fn_sig_for_fn_abi<'tcx>(
         ty::Closure(def_id, args) => {
             let sig = args.as_closure().sig();
 
-            let bound_vars = tcx.mk_bound_variable_kinds_from_iter(
-                sig.bound_vars().iter().chain(iter::once(ty::BoundVariableKind::Region(ty::BrEnv))),
-            );
+            let bound_vars =
+                tcx.mk_bound_variable_kinds_from_iter(sig.bound_vars().iter().chain(iter::once(
+                    ty::BoundVariableKind::Region(ty::BoundRegionKind::ClosureEnv),
+                )));
             let br = ty::BoundRegion {
                 var: ty::BoundVar::from_usize(bound_vars.len() - 1),
-                kind: ty::BoundRegionKind::BrEnv,
+                kind: ty::BoundRegionKind::ClosureEnv,
             };
             let env_region = ty::Region::new_bound(tcx, ty::INNERMOST, br);
             let env_ty = tcx.closure_env_ty(
@@ -105,12 +106,13 @@ fn fn_sig_for_fn_abi<'tcx>(
         ty::CoroutineClosure(def_id, args) => {
             let coroutine_ty = Ty::new_coroutine_closure(tcx, def_id, args);
             let sig = args.as_coroutine_closure().coroutine_closure_sig();
-            let bound_vars = tcx.mk_bound_variable_kinds_from_iter(
-                sig.bound_vars().iter().chain(iter::once(ty::BoundVariableKind::Region(ty::BrEnv))),
-            );
+            let bound_vars =
+                tcx.mk_bound_variable_kinds_from_iter(sig.bound_vars().iter().chain(iter::once(
+                    ty::BoundVariableKind::Region(ty::BoundRegionKind::ClosureEnv),
+                )));
             let br = ty::BoundRegion {
                 var: ty::BoundVar::from_usize(bound_vars.len() - 1),
-                kind: ty::BoundRegionKind::BrEnv,
+                kind: ty::BoundRegionKind::ClosureEnv,
             };
             let env_region = ty::Region::new_bound(tcx, ty::INNERMOST, br);
             // When this `CoroutineClosure` comes from a `ConstructCoroutineInClosureShim`,
@@ -161,11 +163,11 @@ fn fn_sig_for_fn_abi<'tcx>(
             let sig = args.as_coroutine().sig();
 
             let bound_vars = tcx.mk_bound_variable_kinds_from_iter(iter::once(
-                ty::BoundVariableKind::Region(ty::BrEnv),
+                ty::BoundVariableKind::Region(ty::BoundRegionKind::ClosureEnv),
             ));
             let br = ty::BoundRegion {
                 var: ty::BoundVar::from_usize(bound_vars.len() - 1),
-                kind: ty::BoundRegionKind::BrEnv,
+                kind: ty::BoundRegionKind::ClosureEnv,
             };
 
             let env_ty = Ty::new_mut_ref(tcx, ty::Region::new_bound(tcx, ty::INNERMOST, br), ty);
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 00082b18a04..a133b4e5f5e 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -304,7 +304,9 @@ pub(crate) fn clean_middle_region(region: ty::Region<'_>) -> Option<Lifetime> {
     match *region {
         ty::ReStatic => Some(Lifetime::statik()),
         _ if !region.has_name() => None,
-        ty::ReBound(_, ty::BoundRegion { kind: ty::BrNamed(_, name), .. }) => Some(Lifetime(name)),
+        ty::ReBound(_, ty::BoundRegion { kind: ty::BoundRegionKind::Named(_, name), .. }) => {
+            Some(Lifetime(name))
+        }
         ty::ReEarlyParam(ref data) => Some(Lifetime(data.name)),
         ty::ReBound(..)
         | ty::ReLateParam(..)
@@ -1896,7 +1898,9 @@ fn clean_trait_object_lifetime_bound<'tcx>(
     match *region {
         ty::ReStatic => Some(Lifetime::statik()),
         ty::ReEarlyParam(region) if region.name != kw::Empty => Some(Lifetime(region.name)),
-        ty::ReBound(_, ty::BoundRegion { kind: ty::BrNamed(_, name), .. }) if name != kw::Empty => {
+        ty::ReBound(_, ty::BoundRegion { kind: ty::BoundRegionKind::Named(_, name), .. })
+            if name != kw::Empty =>
+        {
             Some(Lifetime(name))
         }
         ty::ReEarlyParam(_)
@@ -2141,7 +2145,7 @@ pub(crate) fn clean_middle_ty<'tcx>(
                 .iter()
                 .flat_map(|pred| pred.bound_vars())
                 .filter_map(|var| match var {
-                    ty::BoundVariableKind::Region(ty::BrNamed(def_id, name))
+                    ty::BoundVariableKind::Region(ty::BoundRegionKind::Named(def_id, name))
                         if name != kw::UnderscoreLifetime =>
                     {
                         Some(GenericParamDef::lifetime(def_id, name))
@@ -3118,7 +3122,7 @@ fn clean_bound_vars(bound_vars: &ty::List<ty::BoundVariableKind>) -> Vec<Generic
     bound_vars
         .into_iter()
         .filter_map(|var| match var {
-            ty::BoundVariableKind::Region(ty::BrNamed(def_id, name))
+            ty::BoundVariableKind::Region(ty::BoundRegionKind::Named(def_id, name))
                 if name != kw::UnderscoreLifetime =>
             {
                 Some(GenericParamDef::lifetime(def_id, name))