{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"if"}]}
        if let FnKind::Fn(ctxt, _, Fn { body: None, sig, .. }) = fk {
        // Functions without bodies cannot have patterns.
            Self::check_decl_no_pat(&sig.decl, |span, ident, mut_ident| {