{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"VarDefNode(s,"}]}
        VarDefNode(s, _) => format!("Var def node [{}]", sm.span_to_diagnostic_string(s)),
        ExprNode(s, _) => format!("Expr node [{}]", sm.span_to_diagnostic_string(s)),
        ClosureNode => "Closure node".to_owned(),