syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"write!(self,"}]}
source_snippet:                 write!(self, "{{")?;
context_before:             ty::Coroutine(did, args) => {
context_after:                 let coroutine_kind = self.tcx().coroutine_kind(did).unwrap();