bary[slot] = true; exprs[slot] = null;
if(bary!=null) bary[slot] = true; if(exprs!=null) exprs[slot] = null;
    private void invalidateArray(String name, int slot)    {        // Stop early if the field has already been invalidated.        if (isFieldInvalidated(name)) return;        boolean[] bary = (boolean[])noarrays.get(name);        JExpression[] exprs = (JExpression[])arrays.get(name);        if (bary == null)        {            bary = new boolean[exprs.length];            noarrays.put(name, bary);        }        bary[slot] = true;        exprs[slot] = null;    }