update(p1)
public
Updates the digest using a given
string and returns self.
The update() method and the
left-shift operator are overridden by each implementation subclass. (One
should be an alias for the other)
static VALUE
rb_digest_instance_update(VALUE self, VALUE str)
{
rb_digest_instance_method_unimpl(self, "update");
UNREACHABLE;
}