Method enter_scope

cranelift/isle/isle/src/codegen.rs:128–131

(&mut self)

    }

    fn enter_scope(&mut self) -> StableSet<BindingId> {
        let new = self.is_bound.clone();
        std::mem::replace(&mut self.is_bound, new)
    }

    fn begin_block(&mut self) -> std::fmt::Result {
        self.indent.push_str("    ");