Method add_var

crates/kernel/src/level.rs:316–321

(&mut self, idx: u64, k: u64)

  offset: u64,
}

#[derive(Debug, Clone, Default)]
struct Node {
  constant: u64,
  var: Vec<VarNode>,
}

impl Node {
  fn add_var(&mut self, idx: u64, k: u64) {