(/ N) now returns the reciprocal of N

This is more compatible with Common Lisp and XEmacs (Bug#21690).  See:
http://lists.gnu.org/archive/html/emacs-devel/2015-10/msg01053.html
* lisp/color.el (color-hue-to-rgb, color-hsl-to-rgb)
(color-xyz-to-srgb, color-xyz-to-lab):
* lisp/emacs-lisp/cl-extra.el (cl-float-limits):
* lisp/net/shr-color.el (shr-color-hue-to-rgb)
(shr-color-hsl-to-rgb-fractions):
Exploit the change to simplify the code a bit.
* lisp/emacs-lisp/bytecomp.el (byte-compile-quo):
Don’t complain about single-argument calls to ‘/’.
* src/data.c (arith_driver, float_arith_driver):
Implement the change.

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 7b31357c345..ac6ccb86f01 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1008,6 +1008,12 @@ dynamically.
 dynamically.  Any third-party code that changes these templates should
 be updated accordingly.
 
++++
+** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
+The new behavior is compatible with Common Lisp and with XEmacs.
+This change does not affect Lisp code intended to be portable to
+Emacs 24.2 and earlier, which did not support unary ‘/’.
+
 
 * Lisp Changes in Emacs 25.1