Good evening, I don't know if this is actually a Guile bug or a documentation bug, but I'm currently learning Guile from the "Guile reference manual" and I've found a mismatch between what the documentation says and what "my" guile does. I use Guile 3.0.9. In my Guile instance (from what I can deduce), last-index is a procedure that returns the index of the first element of a list that matches with a s-expresion. For example: (list-index '(1 2 3) 3) -> 2 (list-index '(height width) 'width) -> 1 But the documentation says otherwise (): list-index pred lst1 lst2 ... Returns the index of the first set of elements, one from each of lst1 lst2 ..., which satisfies pred. If I try to run list-index examples (from the documentation) I get an error because it doesn't know how to deal with a procedure as the first argument. I'm missing something? I understand that list-index it's defined in SRFI-1 and maybe a Guile definition is shadowing the SRFI-1 definition. But where is the Guile documentation for this shadowing list-index? In the Guile Reference Manual list-index it's only described inside SRFI-1 module. Thank you for your help. Forgive me for any inconvenience, Marius.