class RSpec::Matchers::BuiltIn::Satisfy

def description
  "satisfy block"
end

def failure_message_for_should
  "expected #{@actual} to satisfy block"
end

def failure_message_for_should_not
  "expected #{@actual} not to satisfy block"
end

def initialize(&block)
  @block = block
end

def matches?(actual, &block)
  @block = block if block
  @actual = actual
  @block.call(actual)
end

def supports_block_expectations?
  false
end