End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
ARGF#seek
ARGF.seek(amount, whence=IO::SEEK_SET) → 0
io.c
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static VALUE
argf_seek_m(int argc, VALUE *argv, VALUE argf)
{
if (!next_argv()) {
rb_raise(rb_eArgError, "no stream to seek");
}
ARGF_FORWARD(argc, argv);
return rb_io_seek_m(argc, argv, ARGF.current_file);
}