End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

StringIO#sync=

sync=(p1)

ext/stringio/stringio.c View on GitHub ↗

static VALUE
strio_first(VALUE self, VALUE arg)
{
    StringIO(self);
    return arg;
}

Returns the argument unchanged. Just for compatibility to IO.

See also #sync #tell #string= #truncate also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0