class SyntaxTree::YARV::SeaOfNodes::MergeNode

It provides a place for Phi nodes to attach their results.
Merge nodes are present in any block that has multiple incoming blocks.

def initialize(id) 

def initialize(id)
  @inputs = []
  @outputs = []
  @id = id
end

def label 

def label
  "#{id} ψ"
end