{"ast_node_type":"variable","tokens":[{"end":40,"kind":"keyword","start":0,"text":"let"}]}
    let (e, backtrace) = e.into_parts();
pub fn format_interp_error<'tcx>(dcx: DiagCtxtHandle<'_>, e: InterpErrorInfo<'tcx>) -> String {
    backtrace.print_backtrace();