{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"ast::FnRetTy::Default(..)"}]}
        ast::FnRetTy::Default(..) => false,
    let has_output = match &f.sig.decl.output {
        ast::FnRetTy::Ty(t) if t.kind.is_unit() => false,