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The standard backtrace filter for minitest.
See Minitest.backtrace_filter=.
Filter bt to something useful. Returns the whole thing if
$DEBUG (ruby) or $MT_DEBUG (env).
 
               # File minitest-5.14.2/lib/minitest.rb, line 1013
def filter bt
  return ["No backtrace"] unless bt
  return bt.dup if $DEBUG || ENV["MT_DEBUG"]
  new_bt = bt.take_while { |line| line !~ MT_RE }
  new_bt = bt.select     { |line| line !~ MT_RE } if new_bt.empty?
  new_bt = bt.dup                                 if new_bt.empty?
  new_bt
end