syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"Some(ty::GenericArgKind::Type(ty))"}]}
source_snippet:             Some(ty::GenericArgKind::Type(ty)) => ty,
context_before:         let ty = match opt_ty {
context_after:             Some(kind) => self.type_param_expected(p, source_ty, kind),