git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2437 c06c8d41-db1a-0410-9941-cceddc491573
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static void corrupt_choose_colours()
{
int colour = BLACK;
do
colour = random_uncommon_colour();
while (colour == env.rock_colour || colour == LIGHTGREY || colour == WHITE);
env.rock_colour = colour;
do
colour = random_uncommon_colour();
while (colour == env.floor_colour || colour == LIGHTGREY
|| colour == WHITE);
env.floor_colour = colour;
}