; Add commentary on location of zerop

* lisp/subr.el (zerop): Add commentary explaining why moving the
function's location within the file broke bootstrap in
2018-07-10T23:08:58-07:00!contovob@tcd.ie.

diff --git a/lisp/subr.el b/lisp/subr.el
index c1d90e3fb18bfef9c14be0996bc8a39f5d874047..a5108eb6558319d5fe1324c9e99139135301e179 100644 (file)
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -548,6 +548,9 @@ If N is omitted or nil, remove the last element."
           (if (> n 0) (setcdr (nthcdr (- (1- m) n) list) nil))
           list))))
 
+;; This function appears here instead of under the 'Basic Lisp
+;; functions' heading because during bootstrap its compiler-macro
+;; requires functions defined under the 'List functions' heading.
 (defun zerop (number)
   "Return t if NUMBER is zero."
   ;; Used to be in C, but it's pointless since (= 0 n) is faster anyway because