Rollup merge of #84987 - lcnr:nits, r=Mark-Simulacrum

small nits

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -2398,9 +2398,6 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                 self.tcx.associated_item(def_id).ident
             ),
             infer::EarlyBoundRegion(_, name) => format!(" for lifetime parameter `{}`", name),
-            infer::BoundRegionInCoherence(name) => {
-                format!(" for lifetime parameter `{}` in coherence check", name)
-            }
             infer::UpvarRegion(ref upvar_id, _) => {
                 let var_name = self.tcx.hir().name(upvar_id.var_path.hir_id);
                 format!(" for capture of `{}` by closure", var_name)

compiler/rustc_infer/src/infer/mod.rs

@@ -453,8 +453,6 @@ pub enum RegionVariableOrigin {
 
     UpvarRegion(ty::UpvarId, Span),
 
-    BoundRegionInCoherence(Symbol),
-
     /// This origin is used for the inference variables that we create
     /// during NLL region processing.
     Nll(NllRegionVariableOrigin),
@@ -1749,7 +1747,6 @@ impl RegionVariableOrigin {
             | EarlyBoundRegion(a, ..)
             | LateBoundRegion(a, ..)
             | UpvarRegion(_, a) => a,
-            BoundRegionInCoherence(_) => rustc_span::DUMMY_SP,
             Nll(..) => bug!("NLL variable used with `span`"),
         }
     }

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -1044,8 +1044,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
     }
 
     /// Returns `true` if the global caches can be used.
-    /// Do note that if the type itself is not in the
-    /// global tcx, the local caches will be used.
     fn can_use_global_caches(&self, param_env: ty::ParamEnv<'tcx>) -> bool {
         // If there are any inference variables in the `ParamEnv`, then we
         // always use a cache local to this particular scope. Otherwise, we