{"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
        let diag: Diag<'_, G> = self.0.into_diag(dcx, level);
    fn into_diag(self, dcx: DiagCtxtHandle<'_>, level: Level) -> Diag<'_, G> {
        let (message, _) = diag.messages.first().expect("`LlvmError` with no message");