SZEDER Gábor wrote:

>                                                      The breakage can
> be simply bogus possible completion words, but it can also be a
> failure:
>   $ git branch '${}'
>   $ git checkout <TAB>
>   bash: ${}: bad substitution

Or arbitrary code execution:

        $ git branch '$(>kilroy-was-here)'
        $ git checkout <TAB>
        $ ls -l kilroy-was-here
        -rw-rw-r-- 1 jrn jrn 0 nov 17 15:40 kilroy-was-here

The final version of this patch should go to maint.  Thanks for
catching it.
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