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ref: 69eca65ef32833f7a0766d1bb5a736c8b36d8d43
parent: 202b7467d8ad52748eafaf20dfe8136f3f426aad
author: Ben Harris <bjh21@bjh21.me.uk>
date: Tue Dec 6 08:34:27 EST 2022

Assert that the back-end has provided a background colour

If we're going to refer to a specific colour, it seems appropriate to
insist that it exists.

--- a/midend.c

+++ b/midend.c

@@ -1312,6 +1312,7 @@

     float *ret;

     ret = me->ourgame->colours(me->frontend, ncolours);

+    assert(*ncolours >= 1);

     {

         int i;