{"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"if"}]}
            if param.is_self() {
        if let (SelfSemantic::No, [param, ..]) = (self_semantic, &*fn_decl.inputs) {
                self.dcx().emit_err(errors::FnParamForbiddenSelf { span: param.span });