syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"write!(self,"}]}
source_snippet:                     write!(self, "coroutine witness")?;
context_before:                 if !self.tcx().sess.verbose_internals() {
context_after:                     if let Some(did) = did.as_local() {