{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"if"}]}
        if let (SelfSemantic::No, [param, ..]) = (self_semantic, &*fn_decl.inputs) {
    fn check_decl_self_param(&self, fn_decl: &FnDecl, self_semantic: SelfSemantic) {
            if param.is_self() {