On Wed, Oct 21, 2020 at 11:59:40AM +0200, Ludovic Courtès wrote: > What material are you referring to? SICP & co.?
I simply used my favourite search engine with something such as scheme language boolean In my case the first link is to the racket manual: https://docs.racket-lang.org/reference/booleans.html Or this: https://courses.cs.washington.edu/courses/cse341/02sp/scheme/basics.html Or the Wikipedia entry: https://en.wikipedia.org/wiki/Scheme_%28programming_language%29 Any kind of search quickly reveals that booleans in Scheme are coded using #t and #f; whereas to find #true and #false, my impression is that one already needs to know that these are possibilities. I find their use more confusing than helpful. Now if we drop the #t from phases as discussed in the present thread, that would be even better. I have never been convinced by phases that always return #t and never #f; what is the point of a return value if it is not really checked? Andreas
