introduce LateParamRegionKind

lcnr · lcnr · commit 9d044a017639 · 2024-12-17T09:40:19.000+01:00
diff --git a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
@@ -189,7 +189,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
     /// 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::ClosureEnv = late_param.bound_region
+            && let ty::LateParamRegionKind::ClosureEnv = late_param.kind
             && 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
@@ -300,17 +300,17 @@ impl<'tcx> MirBorrowckCtxt<'_, '_, 'tcx> {
                 Some(RegionName { name: kw::StaticLifetime, source: RegionNameSource::Static })
             }
 
-            ty::ReLateParam(late_param) => match late_param.bound_region {
-                ty::BoundRegionKind::Named(region_def_id, name) => {
+            ty::ReLateParam(late_param) => match late_param.kind {
+                ty::LateParamRegionKind::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!(
                         "bound region named: {:?}, is_named: {:?}",
                         name,
-                        late_param.bound_region.is_named()
+                        late_param.kind.is_named()
                     );
 
-                    if late_param.bound_region.is_named() {
+                    if late_param.kind.is_named() {
                         // A named region that is actually named.
                         Some(RegionName {
                             name,
@@ -332,7 +332,7 @@ impl<'tcx> MirBorrowckCtxt<'_, '_, 'tcx> {
                     }
                 }
 
-                ty::BoundRegionKind::ClosureEnv => {
+                ty::LateParamRegionKind::ClosureEnv => {
                     let def_ty = self.regioncx.universal_regions().defining_ty;
 
                     let closure_kind = match def_ty {
@@ -369,7 +369,7 @@ impl<'tcx> MirBorrowckCtxt<'_, '_, 'tcx> {
                     })
                 }
 
-                ty::BoundRegionKind::Anon => None,
+                ty::LateParamRegionKind::Anon(_) => None,
             },
 
             ty::ReBound(..)
diff --git a/compiler/rustc_borrowck/src/universal_regions.rs b/compiler/rustc_borrowck/src/universal_regions.rs
@@ -843,8 +843,9 @@ impl<'tcx> BorrowckInferCtxt<'tcx> {
     {
         let (value, _map) = self.tcx.instantiate_bound_regions(value, |br| {
             debug!(?br);
+            let kind = ty::LateParamRegionKind::from_bound(br.var, br.kind);
             let liberated_region =
-                ty::Region::new_late_param(self.tcx, all_outlive_scope.to_def_id(), br.kind);
+                ty::Region::new_late_param(self.tcx, all_outlive_scope.to_def_id(), kind);
             let region_vid = {
                 let name = match br.kind.get_name() {
                     Some(name) => name,
@@ -942,12 +943,13 @@ fn for_each_late_bound_region_in_item<'tcx>(
         return;
     }
 
-    for bound_var in tcx.late_bound_vars(tcx.local_def_id_to_hir_id(mir_def_id)) {
-        let ty::BoundVariableKind::Region(bound_region) = bound_var else {
-            continue;
-        };
-        let liberated_region =
-            ty::Region::new_late_param(tcx, mir_def_id.to_def_id(), bound_region);
-        f(liberated_region);
+    for (idx, bound_var) in
+        tcx.late_bound_vars(tcx.local_def_id_to_hir_id(mir_def_id)).iter().enumerate()
+    {
+        if let ty::BoundVariableKind::Region(kind) = bound_var {
+            let kind = ty::LateParamRegionKind::from_bound(ty::BoundVar::from_usize(idx), kind);
+            let liberated_region = ty::Region::new_late_param(tcx, mir_def_id.to_def_id(), kind);
+            f(liberated_region);
+        }
     }
 }
diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
@@ -430,12 +430,12 @@ fn compare_method_predicate_entailment<'tcx>(
     Ok(())
 }
 
-struct RemapLateBound<'a, 'tcx> {
+struct RemapLateParam<'a, 'tcx> {
     tcx: TyCtxt<'tcx>,
-    mapping: &'a FxIndexMap<ty::BoundRegionKind, ty::BoundRegionKind>,
+    mapping: &'a FxIndexMap<ty::LateParamRegionKind, ty::LateParamRegionKind>,
 }
 
-impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateBound<'_, 'tcx> {
+impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateParam<'_, 'tcx> {
     fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
@@ -445,7 +445,7 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateBound<'_, 'tcx> {
             ty::Region::new_late_param(
                 self.tcx,
                 fr.scope,
-                self.mapping.get(&fr.bound_region).copied().unwrap_or(fr.bound_region),
+                self.mapping.get(&fr.kind).copied().unwrap_or(fr.kind),
             )
         } else {
             r
diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs
@@ -289,19 +289,24 @@ fn report_mismatched_rpitit_signature<'tcx>(
         tcx.fn_sig(trait_m_def_id).skip_binder().bound_vars(),
         tcx.fn_sig(impl_m_def_id).skip_binder().bound_vars(),
     )
-    .filter_map(|(impl_bv, trait_bv)| {
+    .enumerate()
+    .filter_map(|(idx, (impl_bv, trait_bv))| {
         if let ty::BoundVariableKind::Region(impl_bv) = impl_bv
             && let ty::BoundVariableKind::Region(trait_bv) = trait_bv
         {
-            Some((impl_bv, trait_bv))
+            let var = ty::BoundVar::from_usize(idx);
+            Some((
+                ty::LateParamRegionKind::from_bound(var, impl_bv),
+                ty::LateParamRegionKind::from_bound(var, trait_bv),
+            ))
         } else {
             None
         }
     })
     .collect();
 
     let mut return_ty =
-        trait_m_sig.output().fold_with(&mut super::RemapLateBound { tcx, mapping: &mapping });
+        trait_m_sig.output().fold_with(&mut super::RemapLateParam { tcx, mapping: &mapping });
 
     if tcx.asyncness(impl_m_def_id).is_async() && tcx.asyncness(trait_m_def_id).is_async() {
         let ty::Alias(ty::Projection, future_ty) = return_ty.kind() else {
diff --git a/compiler/rustc_hir_analysis/src/check/wfcheck.rs b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
@@ -2340,8 +2340,11 @@ fn lint_redundant_lifetimes<'tcx>(
     );
     // If we are in a function, add its late-bound lifetimes too.
     if matches!(def_kind, DefKind::Fn | DefKind::AssocFn) {
-        for var in tcx.fn_sig(owner_id).instantiate_identity().bound_vars() {
+        for (idx, var) in
+            tcx.fn_sig(owner_id).instantiate_identity().bound_vars().iter().enumerate()
+        {
             let ty::BoundVariableKind::Region(kind) = var else { continue };
+            let kind = ty::LateParamRegionKind::from_bound(ty::BoundVar::from_usize(idx), kind);
             lifetimes.push(ty::Region::new_late_param(tcx, owner_id.to_def_id(), kind));
         }
     }
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
@@ -356,7 +356,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 ty::Region::new_late_param(
                     tcx,
                     scope.to_def_id(),
-                    ty::BoundRegionKind::Named(id.to_def_id(), name),
+                    ty::LateParamRegionKind::Named(id.to_def_id(), name),
                 )
 
                 // (*) -- not late-bound, won't change
diff --git a/compiler/rustc_lint/src/impl_trait_overcaptures.rs b/compiler/rustc_lint/src/impl_trait_overcaptures.rs
@@ -325,7 +325,7 @@ where
                         ParamKind::Free(def_id, name) => ty::Region::new_late_param(
                             self.tcx,
                             self.parent_def_id.to_def_id(),
-                            ty::BoundRegionKind::Named(def_id, name),
+                            ty::LateParamRegionKind::Named(def_id, name),
                         ),
                         // Totally ignore late bound args from binders.
                         ParamKind::Late => return true,
@@ -475,7 +475,7 @@ fn extract_def_id_from_arg<'tcx>(
             )
             | ty::ReLateParam(ty::LateParamRegion {
                 scope: _,
-                bound_region: ty::BoundRegionKind::Named(def_id, ..),
+                kind: ty::LateParamRegionKind::Named(def_id, ..),
             }) => def_id,
             _ => unreachable!(),
         },
@@ -544,7 +544,7 @@ impl<'tcx> TypeRelation<TyCtxt<'tcx>> for FunctionalVariances<'tcx> {
             )
             | ty::ReLateParam(ty::LateParamRegion {
                 scope: _,
-                bound_region: ty::BoundRegionKind::Named(def_id, ..),
+                kind: ty::LateParamRegionKind::Named(def_id, ..),
             }) => def_id,
             _ => {
                 return Ok(a);
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
@@ -3092,7 +3092,7 @@ impl<'tcx> TyCtxt<'tcx> {
                     return ty::Region::new_late_param(
                         self,
                         new_parent.to_def_id(),
-                        ty::BoundRegionKind::Named(
+                        ty::LateParamRegionKind::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
@@ -270,7 +270,8 @@ impl<'tcx> TyCtxt<'tcx> {
         T: TypeFoldable<TyCtxt<'tcx>>,
     {
         self.instantiate_bound_regions_uncached(value, |br| {
-            ty::Region::new_late_param(self, all_outlive_scope, br.kind)
+            let kind = ty::LateParamRegionKind::from_bound(br.var, br.kind);
+            ty::Region::new_late_param(self, all_outlive_scope, kind)
         })
     }
 
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
@@ -84,7 +84,8 @@ pub use self::predicate::{
     TypeOutlivesPredicate,
 };
 pub use self::region::{
-    BoundRegion, BoundRegionKind, EarlyParamRegion, LateParamRegion, Region, RegionKind, RegionVid,
+    BoundRegion, BoundRegionKind, EarlyParamRegion, LateParamRegion, LateParamRegionKind, Region,
+    RegionKind, RegionVid,
 };
 pub use self::rvalue_scopes::RvalueScopes;
 pub use self::sty::{
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -2375,8 +2375,8 @@ impl<'tcx> PrettyPrinter<'tcx> for FmtPrinter<'_, 'tcx> {
         match *region {
             ty::ReEarlyParam(ref data) => data.has_name(),
 
+            ty::ReLateParam(ty::LateParamRegion { kind, .. }) => kind.is_named(),
             ty::ReBound(_, ty::BoundRegion { kind: br, .. })
-            | ty::ReLateParam(ty::LateParamRegion { bound_region: br, .. })
             | ty::RePlaceholder(ty::Placeholder {
                 bound: ty::BoundRegion { kind: br, .. }, ..
             }) => {
@@ -2449,8 +2449,13 @@ impl<'tcx> FmtPrinter<'_, 'tcx> {
                     return Ok(());
                 }
             }
+            ty::ReLateParam(ty::LateParamRegion { kind, .. }) => {
+                if let Some(name) = kind.get_name() {
+                    p!(write("{}", name));
+                    return Ok(());
+                }
+            }
             ty::ReBound(_, ty::BoundRegion { kind: br, .. })
-            | ty::ReLateParam(ty::LateParamRegion { bound_region: br, .. })
             | ty::RePlaceholder(ty::Placeholder {
                 bound: ty::BoundRegion { kind: br, .. }, ..
             }) => {
diff --git a/compiler/rustc_middle/src/ty/region.rs b/compiler/rustc_middle/src/ty/region.rs
@@ -70,9 +70,10 @@ impl<'tcx> Region<'tcx> {
     pub fn new_late_param(
         tcx: TyCtxt<'tcx>,
         scope: DefId,
-        bound_region: ty::BoundRegionKind,
+        kind: LateParamRegionKind,
     ) -> Region<'tcx> {
-        tcx.intern_region(ty::ReLateParam(ty::LateParamRegion { scope, bound_region }))
+        let data = LateParamRegion { scope, kind };
+        tcx.intern_region(ty::ReLateParam(data))
     }
 
     #[inline]
@@ -125,8 +126,8 @@ impl<'tcx> Region<'tcx> {
         match kind {
             ty::ReEarlyParam(region) => Region::new_early_param(tcx, region),
             ty::ReBound(debruijn, region) => Region::new_bound(tcx, debruijn, region),
-            ty::ReLateParam(ty::LateParamRegion { scope, bound_region }) => {
-                Region::new_late_param(tcx, scope, bound_region)
+            ty::ReLateParam(ty::LateParamRegion { scope, kind }) => {
+                Region::new_late_param(tcx, scope, kind)
             }
             ty::ReStatic => tcx.lifetimes.re_static,
             ty::ReVar(vid) => Region::new_var(tcx, vid),
@@ -166,7 +167,7 @@ impl<'tcx> Region<'tcx> {
             match *self {
                 ty::ReEarlyParam(ebr) => Some(ebr.name),
                 ty::ReBound(_, br) => br.kind.get_name(),
-                ty::ReLateParam(fr) => fr.bound_region.get_name(),
+                ty::ReLateParam(fr) => fr.kind.get_name(),
                 ty::ReStatic => Some(kw::StaticLifetime),
                 ty::RePlaceholder(placeholder) => placeholder.bound.kind.get_name(),
                 _ => None,
@@ -188,7 +189,7 @@ impl<'tcx> Region<'tcx> {
         match *self {
             ty::ReEarlyParam(ebr) => ebr.has_name(),
             ty::ReBound(_, br) => br.kind.is_named(),
-            ty::ReLateParam(fr) => fr.bound_region.is_named(),
+            ty::ReLateParam(fr) => fr.kind.is_named(),
             ty::ReStatic => true,
             ty::ReVar(..) => false,
             ty::RePlaceholder(placeholder) => placeholder.bound.kind.is_named(),
@@ -311,7 +312,7 @@ impl<'tcx> Region<'tcx> {
                 Some(tcx.generics_of(binding_item).region_param(ebr, tcx).def_id)
             }
             ty::ReLateParam(ty::LateParamRegion {
-                bound_region: ty::BoundRegionKind::Named(def_id, _),
+                kind: ty::LateParamRegionKind::Named(def_id, _),
                 ..
             }) => Some(def_id),
             _ => None,
@@ -359,7 +360,71 @@ impl std::fmt::Debug for EarlyParamRegion {
 /// different parameters apart.
 pub struct LateParamRegion {
     pub scope: DefId,
-    pub bound_region: BoundRegionKind,
+    pub kind: LateParamRegionKind,
+}
+
+/// When liberating bound regions, we map their [`BoundRegionKind`]
+/// to this as we need to track the index of anonymous regions. We
+/// otherwise end up liberating multiple bound regions to the same
+/// late-bound region.
+#[derive(Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable, Copy)]
+#[derive(HashStable)]
+pub enum LateParamRegionKind {
+    /// An anonymous region parameter for a given fn (&T)
+    ///
+    /// Unlike [`BoundRegionKind::Anon`], this tracks the index of the
+    /// liberated bound region.
+    ///
+    /// We should ideally never liberate anonymous regions, but do so for the
+    /// sake of diagnostics in `FnCtxt::sig_of_closure_with_expectation`.
+    Anon(u32),
+
+    /// Named region parameters for functions (a in &'a T)
+    ///
+    /// The `DefId` is needed to distinguish free regions in
+    /// the event of shadowing.
+    Named(DefId, Symbol),
+
+    /// Anonymous region for the implicit env pointer parameter
+    /// to a closure
+    ClosureEnv,
+}
+
+impl LateParamRegionKind {
+    pub fn from_bound(var: BoundVar, br: BoundRegionKind) -> LateParamRegionKind {
+        match br {
+            BoundRegionKind::Anon => LateParamRegionKind::Anon(var.as_u32()),
+            BoundRegionKind::Named(def_id, name) => LateParamRegionKind::Named(def_id, name),
+            BoundRegionKind::ClosureEnv => LateParamRegionKind::ClosureEnv,
+        }
+    }
+
+    pub fn is_named(&self) -> bool {
+        match *self {
+            LateParamRegionKind::Named(_, name) => {
+                name != kw::UnderscoreLifetime && name != kw::Empty
+            }
+            _ => false,
+        }
+    }
+
+    pub fn get_name(&self) -> Option<Symbol> {
+        if self.is_named() {
+            match *self {
+                LateParamRegionKind::Named(_, name) => return Some(name),
+                _ => unreachable!(),
+            }
+        }
+
+        None
+    }
+
+    pub fn get_id(&self) -> Option<DefId> {
+        match *self {
+            LateParamRegionKind::Named(id, _) => Some(id),
+            _ => None,
+        }
+    }
 }
 
 #[derive(Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable, Copy)]
diff --git a/compiler/rustc_middle/src/ty/structural_impls.rs b/compiler/rustc_middle/src/ty/structural_impls.rs
@@ -77,7 +77,23 @@ impl fmt::Debug for ty::BoundRegionKind {
 
 impl fmt::Debug for ty::LateParamRegion {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "ReLateParam({:?}, {:?})", self.scope, self.bound_region)
+        write!(f, "ReLateParam({:?}, {:?})", self.scope, self.kind)
+    }
+}
+
+impl fmt::Debug for ty::LateParamRegionKind {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            ty::LateParamRegionKind::Anon(idx) => write!(f, "BrAnon({idx})"),
+            ty::LateParamRegionKind::Named(did, name) => {
+                if did.is_crate_root() {
+                    write!(f, "BrNamed({name})")
+                } else {
+                    write!(f, "BrNamed({did:?}, {name})")
+                }
+            }
+            ty::LateParamRegionKind::ClosureEnv => write!(f, "BrEnv"),
+        }
     }
 }
 
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
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
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
diff --git a/compiler/rustc_trait_selection/src/errors/note_and_explain.rs b/compiler/rustc_trait_selection/src/errors/note_and_explain.rs
diff --git a/src/tools/clippy/clippy_lints/src/ptr.rs b/src/tools/clippy/clippy_lints/src/ptr.rs

Original file line number	Diff line number	Diff line change
`@@ -189,7 +189,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {`
`189`	`189`	/// Returns `true` if a closure is inferred to be an `FnMut` closure.
`190`	`190`	`fn is_closure_fn_mut(&self, fr: RegionVid) -> bool {`
`191`	`191`	`if let Some(ty::ReLateParam(late_param)) = self.to_error_region(fr).as_deref()`
`192`		`- && let ty::BoundRegionKind::ClosureEnv = late_param.bound_region`
	`192`	`+ && let ty::LateParamRegionKind::ClosureEnv = late_param.kind`
`193`	`193`	`&& let DefiningTy::Closure(_, args) = self.regioncx.universal_regions().defining_ty`
`194`	`194`	`{`
`195`	`195`	`return args.as_closure().kind() == ty::ClosureKind::FnMut;`
Original file line number	Diff line number	Diff line change
`@@ -430,12 +430,12 @@ fn compare_method_predicate_entailment<'tcx>(`
`430`	`430`	`Ok(())`
`431`	`431`	`}`
`432`	`432`
`433`		`-struct RemapLateBound<'a, 'tcx> {`
	`433`	`+struct RemapLateParam<'a, 'tcx> {`
`434`	`434`	`tcx: TyCtxt<'tcx>,`
`435`		`- mapping: &'a FxIndexMap<ty::BoundRegionKind, ty::BoundRegionKind>,`
	`435`	`+ mapping: &'a FxIndexMap<ty::LateParamRegionKind, ty::LateParamRegionKind>,`
`436`	`436`	`}`
`437`	`437`
`438`		`-impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateBound<'_, 'tcx> {`
	`438`	`+impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateParam<'_, 'tcx> {`
`439`	`439`	`fn cx(&self) -> TyCtxt<'tcx> {`
`440`	`440`	`self.tcx`
`441`	`441`	`}`
`@@ -445,7 +445,7 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateBound<'_, 'tcx> {`
`445`	`445`	`ty::Region::new_late_param(`
`446`	`446`	`self.tcx,`
`447`	`447`	`fr.scope,`
`448`		`- self.mapping.get(&fr.bound_region).copied().unwrap_or(fr.bound_region),`
	`448`	`+ self.mapping.get(&fr.kind).copied().unwrap_or(fr.kind),`
`449`	`449`	`)`
`450`	`450`	`} else {`
`451`	`451`	`r`
Original file line number	Diff line number	Diff line change
`@@ -2340,8 +2340,11 @@ fn lint_redundant_lifetimes<'tcx>(`
`2340`	`2340`	`);`
`2341`	`2341`	`// If we are in a function, add its late-bound lifetimes too.`
`2342`	`2342`	`if matches!(def_kind, DefKind::Fn \| DefKind::AssocFn) {`
`2343`		`- for var in tcx.fn_sig(owner_id).instantiate_identity().bound_vars() {`
	`2343`	`+ for (idx, var) in`
	`2344`	`+ tcx.fn_sig(owner_id).instantiate_identity().bound_vars().iter().enumerate()`
	`2345`	`+ {`
`2344`	`2346`	`let ty::BoundVariableKind::Region(kind) = var else { continue };`
	`2347`	`+ let kind = ty::LateParamRegionKind::from_bound(ty::BoundVar::from_usize(idx), kind);`
`2345`	`2348`	`lifetimes.push(ty::Region::new_late_param(tcx, owner_id.to_def_id(), kind));`
`2346`	`2349`	`}`
`2347`	`2350`	`}`
Original file line number	Diff line number	Diff line change
`@@ -356,7 +356,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {`
`356`	`356`	`ty::Region::new_late_param(`
`357`	`357`	`tcx,`
`358`	`358`	`scope.to_def_id(),`
`359`		`- ty::BoundRegionKind::Named(id.to_def_id(), name),`
	`359`	`+ ty::LateParamRegionKind::Named(id.to_def_id(), name),`
`360`	`360`	`)`
`361`	`361`
`362`	`362`	`// (*) -- not late-bound, won't change`
Original file line number	Diff line number	Diff line change
`@@ -270,7 +270,8 @@ impl<'tcx> TyCtxt<'tcx> {`
`270`	`270`	`T: TypeFoldable<TyCtxt<'tcx>>,`
`271`	`271`	`{`
`272`	`272`	`self.instantiate_bound_regions_uncached(value, \|br\| {`
`273`		`- ty::Region::new_late_param(self, all_outlive_scope, br.kind)`
	`273`	`+ let kind = ty::LateParamRegionKind::from_bound(br.var, br.kind);`
	`274`	`+ ty::Region::new_late_param(self, all_outlive_scope, kind)`
`274`	`275`	`})`
`275`	`276`	`}`
`276`	`277`