syntax_data: {"ast_node_type":"function","tokens":[{"end":41,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn visit_ty(&mut self, t: Ty<'tcx>) {
context_before: impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for MaxUniverse {
context_after:         if let ty::Placeholder(placeholder) = t.kind() {