{"ast_node_type":"function","tokens":[{"end":59,"kind":"keyword","start":0,"text":"fn"}]}
    fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
impl<'tcx> Visitor<'tcx> for CheckParameters<'tcx> {
        if let hir::ExprKind::Path(hir::QPath::Resolved(