class StackProf::Report

def print_stackcollapse
  raise "profile does not include raw samples (add `raw: true` to collecting StackProf.run)" unless raw = data[:raw]
  while len = raw.shift
    frames = raw.slice!(0, len)
    weight = raw.shift
    print frames.map{ |a| data[:frames][a][:name] }.join(';')
    puts " #{weight}"
  end
end