BLACKBIT           32 lib/lua/lgc.c  #define maskmarks	cast_byte(~(bitmask(BLACKBIT)|WHITEBITS))
BLACKBIT           38 lib/lua/lgc.c  #define black2gray(x)	resetbit((x)->gch.marked, BLACKBIT)
BLACKBIT           66 lib/lua/lgc.h  #define isblack(x)      testbit((x)->gch.marked, BLACKBIT)
BLACKBIT           73 lib/lua/lgc.h  #define gray2black(x)	l_setbit((x)->gch.marked, BLACKBIT)