Match only things where the block evaluates to true.

Methods
Public Class methods
new(methods)
    # File lib/flexmock/argument_matchers.rb, line 73
73:     def initialize(methods)
74:       @methods = methods
75:     end
Public Instance methods
===(target)
    # File lib/flexmock/argument_matchers.rb, line 76
76:     def ===(target)
77:       @methods.all? { |m| target.respond_to?(m) }
78:     end
inspect()
    # File lib/flexmock/argument_matchers.rb, line 79
79:     def inspect
80:       "ducktype(#{@methods.map{|m| m.inspect}.join(',')})"
81:     end