Rollup merge of #138926 - nnethercote:less-kw-Empty-rustc_middle, r=lcnr

Remove `kw::Empty` uses from `rustc_middle`.

There are several places in `rustc_middle` that check for an empty lifetime name. These checks appear to be totally unnecessary, because empty lifetime names aren't produced here. (Empty lifetime names *are* possible in `hir::Lifetime`. Perhaps there was some confusion between it and the `rustc_middle` types?)

This commit removes the `kw::Empty` checks.

r? `@lcnr`

1 files changed, 3 insertions, 6 deletions

diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 6f660df4d7d..5e7a49f82c7 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -1943,14 +1943,11 @@ fn clean_trait_object_lifetime_bound<'tcx>(
     // latter contrary to `clean_middle_region`.
     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::BoundRegionKind::Named(_, name), .. })
-            if name != kw::Empty =>
-        {
+        ty::ReEarlyParam(region) => Some(Lifetime(region.name)),
+        ty::ReBound(_, ty::BoundRegion { kind: ty::BoundRegionKind::Named(_, name), .. }) => {
             Some(Lifetime(name))
         }
-        ty::ReEarlyParam(_)
-        | ty::ReBound(..)
+        ty::ReBound(..)
         | ty::ReLateParam(_)
         | ty::ReVar(_)
         | ty::RePlaceholder(_)