Remove out-of-date comment.

nnethercote · nnethercote · commit 24445d3b6a0e · 2024-05-10T09:55:09.000+10:00
The use of `Binder` was removed in the recent rust-lang#123900, but the comment wasn't removed at the same time.
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
@@ -3443,8 +3443,6 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
         self.dcx().try_steal_replace_and_emit_err(self.tcx.def_span(def_id), StashKey::Cycle, err)
     }
 
-    // FIXME(@lcnr): This function could be changed to trait `TraitRef` directly
-    // instead of using a `Binder`.
     fn report_signature_mismatch_error(
         &self,
         obligation: &PredicateObligation<'tcx>,

Original file line number	Diff line number	Diff line change
`@@ -3443,8 +3443,6 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {`
`3443`	`3443`	`self.dcx().try_steal_replace_and_emit_err(self.tcx.def_span(def_id), StashKey::Cycle, err)`
`3444`	`3444`	`}`
`3445`	`3445`
`3446`		- // FIXME(@lcnr): This function could be changed to trait `TraitRef` directly
`3447`		- // instead of using a `Binder`.
`3448`	`3446`	`fn report_signature_mismatch_error(`
`3449`	`3447`	`&self,`
`3450`	`3448`	`obligation: &PredicateObligation<'tcx>,`