visit the paths in pre-expansion macros

src/librustc/lint/context.rs

@@ -1117,6 +1117,13 @@ fn visit_mac_def(&mut self, mac: &'a ast::MacroDef, id: ast::NodeId) {
     }
 
     fn visit_mac(&mut self, mac: &'a ast::Mac) {
+        // FIXME(#54110): So, this setup isn't really right. I think
+        // that (a) the libsyntax visitor ought to be doing this as
+        // part of `walk_mac`, and (b) we should be calling
+        // `visit_path`, *but* that would require a `NodeId`, and I
+        // want to get #53686 fixed quickly. -nmatsakis
+        ast_visit::walk_path(self, &mac.node.path);
+
         run_lints!(self, check_mac, mac);
     }
 }