class RSpec::Matchers::BuiltIn::RaiseError

def matches?(given_proc, negative_expectation = false)
  if negative_expectation && (expecting_specific_exception? || @expected_message)
    what_to_deprecate = if expecting_specific_exception? && @expected_message
                          "`expect { }.not_to raise_error(SpecificErrorClass, message)`"
                        elsif expecting_specific_exception?
                          "`expect { }.not_to raise_error(SpecificErrorClass)`"
                        elsif @expected_message
                          "`expect { }.not_to raise_error(message)`"
                        end
    RSpec.deprecate(
      what_to_deprecate,
      :replacement => "`expect { }.not_to raise_error` (with no args)"
    )
  end
  @raised_expected_error = false
  @with_expected_message = false
  @eval_block = false
  @eval_block_passed = false
  unless given_proc.respond_to?(:call)
    ::Kernel.warn "`raise_error` was called with non-proc object #{given_proc.inspect}"
    return false
  end
  begin
    given_proc.call
  rescue Exception => @actual_error
    if @actual_error == @expected_error || @expected_error === @actual_error
      @raised_expected_error = true
      @with_expected_message = verify_message
    end
  end
  unless negative_expectation
    eval_block if @raised_expected_error && @with_expected_message && @block
  end
ensure
  return (@raised_expected_error & @with_expected_message) ? (@eval_block ? @eval_block_passed : true) : false
end