On Sat, Nov 19, 2016 at 10:18 PM, Jan Nieuwenhuizen <jann...@gnu.org> wrote: > Jan Synáček writes: > >> scheme@(guile-user)> ,use (srfi srfi-1) >> scheme@(guile-user)> (take (list 1 2 3) 4) >> ERROR: In procedure list-head: >> ERROR: In procedure list-head: Wrong type argument in position 1 >> (expecting pair): () > > That's expected. > >> scheme@(guile-user) [1]> (drop (list 1 2 3) 4) >> ERROR: In procedure list-tail: >> ERROR: In procedure list-tail: Wrong type argument in position 1 >> (expecting pair): () > > That too. > >> Please, tell me that this is just a mistake... > > It's just a mistake! > >> This can't be true. I still can't believe it. This is from >> 2.0.11. Please, tell me that the implementation is fixed in 2.2. > > You'd have to give me more clues about what it is that puzzles you > and why. > >> Yours truly puzzled, > > Do you possibbly mean something like > > --8<---------------cut here---------------start------------->8--- > scheme@(guile-user)> (use-modules (srfi srfi-1)) > scheme@(guile-user)> (take '(list 1 2 3) 4) > $1 = (list 1 2 3) > scheme@(guile-user)> (drop '(list 1 2 3) 4) > $2 = () > --8<---------------cut here---------------end--------------->8---
Yes, this is exactly how it should work, thank you. For some reason, I thought that was clear, but apparently wasn't. What's the point of using take/drop when you have to know the length of the list? Cheers, -- Jan Synáček
