Method push_hole

regex/src/compile.rs:703–707

(&mut self, inst: InstHole)

    }

    fn push_hole(&mut self, inst: InstHole) -> Hole {
        let hole = self.insts.len();
        self.insts.push(MaybeInst::Uncompiled(inst));
        Hole::One(hole)
    }

    fn push_split_hole(&mut self) -> Hole {
        let hole = self.insts.len();