{"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":")"}]}
    ) -> hir::BodyId {
        f: impl FnOnce(&mut Self) -> (&'hir [hir::Param<'hir>], hir::Expr<'hir>),
        let prev_coroutine_kind = self.coroutine_kind.take();