class Exception

:nodoc:
All backtrace munging can be turned off with the --backtrace switch
features/the_feature_file.feature:41:in ‘Given some step’
features/step_definitions/the_step_definition.rb:in ‘/some step/’
lib/myapp/some_other_file.rb:in ‘/some_other_method/’
lib/myapp/some_file.rb:in ‘/some_method/’
or if the exception is raised in the tested code:
features/the_feature_file.feature:41:in ‘Given some step’
features/step_definitions/the_step_definition.rb:in ‘/some step/’
The result is that backtraces look like this:
* Non intersting lines are stripped out
* The line that calls #cucumber_instance_exec is replaced with the StepDefinition’s regexp
* The line of the failing .feature line is appended to the backtrace
Exception extension that tweaks Exception backtraces:

def self.cucumber_full_backtrace=(v) 

def self.cucumber_full_backtrace=(v)
  @@cucumber_full_backtrace = v
end

def self.cucumber_strip_backtrace!(backtrace, instance_exec_invocation_line, pseudo_method)

Strips the backtrace from +line+ and down 
def self.cucumber_strip_backtrace!(backtrace, instance_exec_invocation_line, pseudo_method)
  return if @@cucumber_full_backtrace
  instance_exec_pos = backtrace.index(instance_exec_invocation_line)
  if instance_exec_pos
    replacement_line = instance_exec_pos + INSTANCE_EXEC_OFFSET
    backtrace[replacement_line].gsub!(/`.*'/, "`#{pseudo_method}'") if pseudo_method
    backtrace[replacement_line+1..-1] = nil
    backtrace.compact!
  else
    # This happens with rails, because they screw up the backtrace
    # before we get here (injecting erb stacktrace and such)
  end
  backtrace.reject! do |line|
    CUCUMBER_FILTER_PATTERNS.detect{|p| line =~ p}
  end
end