# File lib/inline.rb, line 390
    def initialize(mod)
      raise ArgumentError, "Class/Module arg is required" unless Module === mod
      # new (but not on some 1.8s) -> inline -> real_caller|eval
      stack = caller
      meth = stack.shift until meth =~ /in .(inline|test_|setup)/ or stack.empty?
      raise "Couldn't discover caller" if stack.empty?
      real_caller = stack.first
      real_caller = stack[3] if real_caller =~ /\(eval\)/
      real_caller =~ /(.*):(\d+)/
      real_caller = $1
      @rb_file = File.expand_path real_caller

      @mod = mod
      @src = []
      @inc = []
      @sig = {}
      @flags = []
      @libs = []
      @init_extra = []
      @include_ruby_first = true
      @inherited_methods = {}
      @struct_name = nil

      @type_map = TYPE_MAP.dup
    end