#'special-form-p; don't error (thank you Jerry James); flesh out docstring. 2007-12-18 Aidan Kehoe <kehoea@parhasard.net> * symbols.c (Fspecial_form_p): Following commentary from Jerry James, don't error if not passed a subr. Flesh out the docstring; give details of what a subr is, what a special form is, and why one should probably not write special forms oneself.