syntax_data: {"ast_node_type":"function","tokens":[{"end":87,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn coroutine_closure_sig(self) -> ty::Binder<I, CoroutineClosureSignature<I>> {
context_after:         let ty::FnPtr(sig_tys, hdr) = self.signature_parts_ty().kind() else { panic!() };