"Fr. Samuel Springuel" <rpspring...@gmail.com> writes: >> On 26 Apr, 2020, at 4:30 AM, Thomas Morley <thomasmorle...@gmail.com> wrote: >> >> I've no clue why positive? fails here. >> Though, for integers >= 0 we have the index? predicate, which works in >> your function. > > Well, I’m glad I’m not the only one baffled. And the index? predicate does > seem to work. > > > >> On 26 Apr, 2020, at 4:41 AM, Lukas-Fabian Moser <l...@gmx.de> wrote: >> >> Well, positive? does not seem to like being called with anything else than a >> number: >> >> (positive? "I'm a string") >> >> fails as well. >> >> I'm not sure as to why that is the case; but anyway, this shows that >> the problem does not come from LilyPond. > > Then is this something that should be reported up the chain somewhere?
Predicates used in argument parsing have to be "primary" in that they have to deliver a result for anything thrown at them. positive? only delivers results for numbers but throws an error for anything else. -- David Kastrup
