Attach TokenStream to ast::Visibility

A `Visibility` does not have outer attributes, so we only capture tokens
when parsing a `macro_rules!` matcher

compiler/rustc_expand/src/expand.rs

@@ -26,7 +26,6 @@ use rustc_session::lint::builtin::UNUSED_DOC_COMMENTS;
 use rustc_session::lint::BuiltinLintDiagnostics;
 use rustc_session::parse::{feature_err, ParseSess};
 use rustc_session::Limit;
-use rustc_span::source_map::respan;
 use rustc_span::symbol::{sym, Ident, Symbol};
 use rustc_span::{ExpnId, FileName, Span, DUMMY_SP};
 
@@ -358,7 +357,11 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
             kind: ast::ItemKind::Mod(krate.module),
             ident: Ident::invalid(),
             id: ast::DUMMY_NODE_ID,
-            vis: respan(krate.span.shrink_to_lo(), ast::VisibilityKind::Public),
+            vis: ast::Visibility {
+                span: krate.span.shrink_to_lo(),
+                kind: ast::VisibilityKind::Public,
+                tokens: None,
+            },
             tokens: None,
         })]);