{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"LockstepIterSize::Unconstrained"}]}
        LockstepIterSize::Unconstrained => {
    match lockstep_iter_size(seq, tscx.interp, &tscx.repeats) {
            return Err(dcx.create_err(NoSyntaxVarsExprRepeat { span: seq.span() }));