Fix Debug impl for LateParamRegionKind.

It uses `Br` prefixes which are inappropriate and appear to have been
incorrectly copy/pasted from the `Debug` impl for `BoundRegionKind`.

Author: nnethercote

compiler/rustc_middle/src/ty/structural_impls.rs

@@ -86,15 +86,15 @@ impl fmt::Debug for ty::LateParamRegion {
 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::Anon(idx) => write!(f, "LateAnon({idx})"),
             ty::LateParamRegionKind::Named(did, name) => {
                 if did.is_crate_root() {
-                    write!(f, "BrNamed({name})")
+                    write!(f, "LateNamed({name})")
                 } else {
-                    write!(f, "BrNamed({did:?}, {name})")
+                    write!(f, "LateNamed({did:?}, {name})")
                 }
             }
-            ty::LateParamRegionKind::ClosureEnv => write!(f, "BrEnv"),
+            ty::LateParamRegionKind::ClosureEnv => write!(f, "LateEnv"),
         }
     }
 }

tests/ui/nll/ty-outlives/impl-trait-captures.stderr

@@ -4,14 +4,14 @@ error[E0700]: hidden type for `Opaque(DefId(0:11 ~ impl_trait_captures[aeb9]::fo
 LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> {
    |                  --     ------------ opaque type defined here
    |                  |
-   |                  hidden type `&ReLateParam(DefId(0:8 ~ impl_trait_captures[aeb9]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[aeb9]::foo::'_), '_)) T` captures the anonymous lifetime defined here
+   |                  hidden type `&ReLateParam(DefId(0:8 ~ impl_trait_captures[aeb9]::foo), LateNamed(DefId(0:13 ~ impl_trait_captures[aeb9]::foo::'_), '_)) T` captures the anonymous lifetime defined here
 LL |     x
    |     ^
    |
-help: add a `use<...>` bound to explicitly capture `ReLateParam(DefId(0:8 ~ impl_trait_captures[aeb9]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[aeb9]::foo::'_), '_))`
+help: add a `use<...>` bound to explicitly capture `ReLateParam(DefId(0:8 ~ impl_trait_captures[aeb9]::foo), LateNamed(DefId(0:13 ~ impl_trait_captures[aeb9]::foo::'_), '_))`
    |
-LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> + use<'a, ReLateParam(DefId(0:8 ~ impl_trait_captures[aeb9]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[aeb9]::foo::'_), '_)), T> {
-   |                                      +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> + use<'a, ReLateParam(DefId(0:8 ~ impl_trait_captures[aeb9]::foo), LateNamed(DefId(0:13 ~ impl_trait_captures[aeb9]::foo::'_), '_)), T> {
+   |                                      +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 error: aborting due to 1 previous error