use PerlIO::get_layers without loading PerlIO.pm #1022
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PerlIO::get_layers is always available if PerlIO is available, without needing to load PerlIO.pm. Rather than trying to load it, we can just test for the existence of the function.
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PerlIO::get_layers is always available if PerlIO is available, without needing to load PerlIO.pm. Rather than trying to load it, we can just test for the existence of the function.