Convert a kw::Empty occurrence to sym::dummy.

`adjust_ident_and_get_scope` returns the symbol it receives unchanged,
and the call site ignores the returned symbol, so this symbol is unused.

Author: nnethercote

compiler/rustc_privacy/src/lib.rs

@@ -40,7 +40,7 @@ use rustc_middle::ty::{
 use rustc_middle::{bug, span_bug};
 use rustc_session::lint;
 use rustc_span::hygiene::Transparency;
-use rustc_span::{Ident, Span, Symbol, kw, sym};
+use rustc_span::{Ident, Span, Symbol, sym};
 use tracing::debug;
 use {rustc_attr_parsing as attr, rustc_hir as hir};
 
@@ -935,8 +935,8 @@ impl<'tcx> NamePrivacyVisitor<'tcx> {
         }
 
         // definition of the field
-        let ident = Ident::new(kw::Empty, use_ctxt);
-        let def_id = self.tcx.adjust_ident_and_get_scope(ident, def.did(), hir_id).1;
+        let ident = Ident::new(sym::dummy, use_ctxt);
+        let (_, def_id) = self.tcx.adjust_ident_and_get_scope(ident, def.did(), hir_id);
         !field.vis.is_accessible_from(def_id, self.tcx)
     }