coverity pointed out the infinite loop below.
I guess it is unreachable or at least hard to reach,
or it would have been reported/fixed before now:
17605 if (index && TREE_CODE (index) == RANGE_EXPR)
17606 {
17607 int count = tree_low_cst (TREE_OPERAND (index, 1), 0)
17608 - tree_low_cst (TREE_OPERAND (index, 0),
0);
Event loop_top: Top of the loop.
Event loop_condition: "0 < count" must remain true for the loop to continue.
Also see events: [loop_bottom]
17609 while (count > 0)
17610 {
17611 if (val)
17612 memcpy (array + curpos, array + pos, fieldsize);
Event loop_bottom: Bottom of the loop.
Also see events: [loop_top][loop_condition]
17613 curpos += fieldsize;
17614 }
17615 }
