Because warn people that "guix pull --details" alone is not what they want adds some complexity, and when '--details' only works in tandem with the option '--list-generations', that’s why I propose this behaviour. Last, about this change… > - (define (no-arguments arg _‌) > + (define (no-arguments arg _) …it a Git twist? I miss what changed––my whitespace mode is badly configured? Cheers, simon