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FILE * T_STDIO PerlIO * T_INOUT ... InputStream T_IN InOutStream T_INOUT OutputStream T_OUT
T_STDIO $var = PerlIO_findFILE(IoIFP(sv_2io($arg))) T_IN ... $var = IoIFP(sv_2io($arg)) T_OUT $var = IoOFP(sv_2io($arg))