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  1. or download this
    if (SvROK(sv) && SvTYPE(sv) == SVt_PVCV)
   warn("sv is a code reference (CV) alright.");
  2. or download this
    if (SvROK(sv) && sv_derived_from(sv, "Foo"))
   warn("sv isa Foo");
  3. or download this
    if (gv_fetchmethod(gv_stashpv("Foo", 0), "Foo::bar"))
   warn("succeeded in finding Foo::bar");