class SyntaxTree::YARV::BasicBlock

instructions do not branch except for the last one.
This object represents a single basic block, wherein all contained

def each_with_length

original instruction sequence.
Yield each instruction in this basic block along with its index from the 
def each_with_length
  return enum_for(:each_with_length) unless block_given?
  length = block_start
  insns.each do |insn|
    yield insn, length
    length += insn.length
  end
end

def initialize(block_start, insns) 

def initialize(block_start, insns)
  @id = "block_#{block_start}"
  @block_start = block_start
  @insns = insns
  @incoming_blocks = []
  @outgoing_blocks = []
end

def verify

the last instruction.
checks that the only instruction in this basic block that branches is
This method is used to verify that the basic block is well formed. It 
def verify
  insns[0...-1].each { |insn| raise unless insn.branch_targets.empty? }
end