here is a bit more info using valgrind tool

———@linux-laptop:~$ valgrind –tool=memcheck mangler
==18907== Memcheck, a memory error detector
==18907== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==18907== Using Valgrind-3.6.1 and LibVEX; rerun with -h for copyright info
==18907== Command: mangler
==18907==
terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::erase
==18907==
==18907== HEAP SUMMARY:
==18907==     in use at exit: 1,007,235 bytes in 3,004 blocks
==18907==   total heap usage: 11,708 allocs, 8,704 frees, 4,571,283 bytes allocated
==18907==
==18907== LEAK SUMMARY:
==18907==    definitely lost: 32,792 bytes in 1 blocks
==18907==    indirectly lost: 0 bytes in 0 blocks
==18907==      possibly lost: 935,948 bytes in 1,600 blocks
==18907==    still reachable: 38,495 bytes in 1,403 blocks
==18907==         suppressed: 0 bytes in 0 blocks
==18907== Rerun with –leak-check=full to see details of leaked memory
==18907==
==18907== For counts of detected and suppressed errors, rerun with: -v
==18907== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 173 from 6)
Aborted (core dumped)
———@linux-laptop:~$

(gdb) run mangler
Starting program: /usr/bin/mangler mangler
[Thread debugging using libthread_db enabled]
terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::erase

Program received signal SIGABRT, Aborted.
0xb7fe1424 in __kernel_vsyscall ()

Reading symbols from /usr/bin/mangler…(no debugging symbols found)…done.
(gdb) run
Starting program: /usr/bin/mangler
[Thread debugging using libthread_db enabled]
terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::erase

Program received signal SIGABRT, Aborted.
0xb7fe1424 in __kernel_vsyscall ()
(gdb) backtrace
#0  0xb7fe1424 in __kernel_vsyscall ()
#1  0xb6b62e71 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#2  0xb6b6634e in abort () at abort.c:92
#3  0xb6d8a0b5 in __gnu_cxx::__verbose_terminate_handler() ()
   from /usr/lib/i386-linux-gnu/libstdc++.so.6
#4  0xb6d87fa5 in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
#5  0xb6d87fe2 in std::terminate() ()
   from /usr/lib/i386-linux-gnu/libstdc++.so.6
#6  0xb6d8814e in __cxa_throw () from /usr/lib/i386-linux-gnu/libstdc++.so.6
#7  0xb6d2d33f in std::__throw_out_of_range(char const*) ()
   from /usr/lib/i386-linux-gnu/libstdc++.so.6
#8  0x080f71c6 in ?? ()
#9  0x080f97d3 in ?? ()
#10 0x080fa049 in ?? ()
#11 0x080fa2a4 in ?? ()
#12 0x080b5d08 in ?? ()
#13 0x08059d7a in ?? ()
#14 0x0811200d in ?? ()
#15 0x08056274 in _init ()
#16 0x08111fa9 in ?? ()
#17 0xb6b4edd5 in __libc_start_main (main=0x80698f0, argc=1,
    ubp_av=0xbffff434, init=0x8111f90, fini=0x8111f80, rtld_fini=0xb7ff0a50,
    stack_end=0xbffff42c) at libc-start.c:185
—Type <return> to continue, or q <return> to quit—
#18 0x08059261 in ?? ()
(gdb)