syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"Some(kind)"}]}
source_snippet:             Some(kind) => self.type_param_expected(p, source_ty, kind),
context_before:             Some(ty::GenericArgKind::Type(ty)) => ty,
context_after:             None => self.type_param_out_of_range(p, source_ty),