syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"ty::GenericArgKind::Const(ct)"}]}
source_snippet:                 ty::GenericArgKind::Const(ct) => self.add_const(ct),
context_before:                 ty::GenericArgKind::Lifetime(lt) => self.add_region(lt),
context_after:             }