{"ast_node_type":"function","tokens":[{"end":83,"kind":"keyword","start":0,"text":"fn"}]}
    fn into_diag_arg(self, path: &mut Option<std::path::PathBuf>) -> DiagArgValue {
impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::UnevaluatedConst<I> {
        format!("{self:?}").into_diag_arg(path)