code: function overrideLeaveNode(node) {
      if (isProcessExit(node)) {
          this.currentNode = node
  
          forwardCurrentToHead(this, node)
          CodePath.getState(this.codePath).makeThrow()
  
          this.original.leaveNode(node)
          this.currentNode = null
      } else {
          originalLeaveNode.call(this, node)
      }
  }
docs: The function to override `CodePathAnalyzer.prototype.leaveNode` in order to
  address `process.exit()` as throw.
  
  @this CodePathAnalyzer
  @param {ASTNode} node - A node to be left.
  @returns {void}