My understanding is that for 2.19, there will be no traditional PDF for the functions available to be called from a Stan program due to the move to HTML. When that happened, we postponed what to do about
rstan::lookup, whose underlying lookup table was based on parsing the LaTeX index for the user manual.
I think @seantalts had a C++ program to output all of the functions that could be called, but I can’t find it anywhere. Does anyone know where it is?