[Bug c++/78393] New: Segfault with --help=^

[dave-gccbugs at earth dot li]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78393

            Bug ID: 78393
           Summary: Segfault with --help=^
           Product: gcc
           Version: 5.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dave-gccbugs at earth dot li
  Target Milestone: ---

I misread the help page, and so asked for help on ^, this caused a segfault.

$ gcc --help=^
cc1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.


$ gcc --version
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609

also happens on 

$ gcc --version
gcc (Debian 4.9.2-10) 4.9.2