CLRALL
blk = (struct header *)CLRALL(blk->nextblk);
next = (struct header *)CLRALL(blk->nextblk);
assert(((struct holdblk *)CLRALL(lblk->header.holder))->blksz >=
assert((char *)CLRALL(blk->nextblk) -
assert((char *)CLRALL(blk->nextblk) -
holdblk = (struct holdblk *)CLRALL(holdblk);
CLRALL(lblk->header.holder))->blksz;