{"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"if"}]}
        if let hir::ExprKind::Let(let_expr) = expr.kind {
    fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
            self.declare((let_expr, expr.hir_id).into());