https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67816
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
#1 0x0000000000ae7683 in duplicate_thread_path (
entry=<edge 0x7ffff6a37620 (79 -> 23)>,
exit=<edge 0x7ffff6a07658 (58 -> 59)>, region=0x1b68550, n_region=10,
region_copy=0x1b6abf0)
at /space/rguenther/src/svn/trunk/gcc/tree-ssa-threadupdate.c:2445
2445 gcc_assert (i + 1 == n_region
(gdb) p i
$1 = 6
(gdb) p n_region
$2 = 10
(gdb) p region_copy[i + 1]
$3 = <basic_block 0x7ffff6a792d8 (114)>
(gdb) p single_succ_edge (bb)->dest
$4 = <basic_block 0x7ffff6a23c98 (53)>
