syntax_data: {"ast_node_type":"other","tokens":[{"end":26,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:                 match rk {
context_before:                 let rk = self.args.get(data.index() as usize).map(|arg| arg.kind());
context_after:                     Some(ty::GenericArgKind::Lifetime(lt)) => self.shift_region_through_binders(lt),