# File lib/mspec/matchers/output_to_fd.rb, line 10
10:   def initialize(expected, to)
11:     @to, @expected = to, expected
12: 
13:     case @to
14:     when STDOUT
15:       @to_name = "STDOUT"
16:     when STDERR
17:       @to_name = "STDERR"
18:     when IO
19:       @to_name = @to.object_id.to_s
20:     else
21:       raise ArgumentError, "#{@to.inspect} is not a supported output target"
22:     end
23:   end