class RSpec::Expectations::ValueExpectationTarget

def enforce_value_expectation(matcher)
  return if supports_value_expectations?(matcher)
  RSpec.deprecate(
    "expect(value).to #{RSpec::Support::ObjectFormatter.format(matcher)}",
    :message =>
      "The implicit block expectation syntax is deprecated, you should pass " \
      "a block rather than an argument to `expect` to use the provided " \
      "block expectation matcher or the matcher must implement " \
      "`supports_value_expectations?`. e.g  `expect { value }.to " \
      "#{RSpec::Support::ObjectFormatter.format(matcher)}` not " \
      "`expect(value).to #{RSpec::Support::ObjectFormatter.format(matcher)}`"
  )
end