Why does perlcall.pod have dSP before call_argv?

<perlcall.pod>
And here is an example of I<call_argv> which will call
I<PrintList>.

    static char * words[] = {"alpha", "beta", "gamma", "delta", NULL};

    static void
    call_PrintList()
    {
        dSP;

        call_argv("PrintList", G_DISCARD, words);
    }
</perlcall.pod>

Why is that dSP there?  Does it do anything?  It looks like a mistake
to me.  Can it be deleted?

It appears to go back to the first version of this document, in
a0d0e21ea (perl 5.000).

• Why does perlcall.pod have dSP before call_argv? by Father Chrysostomos
• Re: Why does perlcall.pod have dSP before call_argv? by Dave Mitchell