End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
StringIO#closed_write?
strio.closed_write? → true or false
ext/stringio/stringio.c
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static VALUE
strio_closed_write(VALUE self)
{
StringIO(self);
if (WRITABLE(self)) return Qfalse;
return Qtrue;
}
Returns true if the stream is not writable, false otherwise.