RubyVM::InstructionSequence#source_hash

static VALUE
iseqw_source_hash(VALUE self)
{
    const rb_iseq_t *iseq = iseqw_check(self);
    if (!ISEQ_BODY(iseq)->source_hash) return Qnil;
    return ULL2NUM(ISEQ_BODY(iseq)->source_hash);
}