[Bug 215040] devel/gflags: gflags_completions.sh kills bash if bash-completion is used

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215040

            Bug ID: 215040
           Summary: devel/gflags: gflags_completions.sh kills bash if
                    bash-completion is used
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: lantw44 at gmail.com
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)
          Assignee: sunpoet at FreeBSD.org

gflags_completions.sh is not intended to be loaded into an interactive bash
process. Please don't move it into ${PREFIX}/etc/bash_completion.d. It causes
bash to exit when bash-completion is loaded. If users use bash as login shell
and load bash-completion in ~/.bashrc or ~/.bash_login, it will cause them to
fail to login.

$ . /path/to/gflags_completions.sh 
bash: -1: bad substitution
<bash process exited>

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