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progname: "filename", line N: message
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error_message (error_code, fmt, a1, a2, a3, a4)
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const void *a1, *a2, *a3, *a4;
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const void *a1, const void *a2, const void *a3, const void *a4)
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fprintf (stderr, "%s: ", program_name);
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fprintf (stderr, fmt, a1, a2, a3, a4);