class Minitest::BacktraceFilter

def filter bt
  return ["No backtrace"] unless bt
  return bt.dup if $DEBUG || ENV["MT_DEBUG"]
  new_bt = bt.take_while { |line| !regexp.match? line.to_s }
  new_bt = bt.select     { |line| !regexp.match? line.to_s } if new_bt.empty?
  new_bt = bt.dup                                            if new_bt.empty?
  new_bt
end

def initialize regexp = MT_RE # :nodoc:
  self.regexp = regexp
end