{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"Some(MetaVarKind::Expr(_))"}]}
                Some(MetaVarKind::Expr(_)) => builder.push(make_ident("foo")),
                Some(MetaVarKind::Literal) => builder.push(make_literal("1")),
                Some(MetaVarKind::Lifetime) => {