@NotNull
  private static List<ValueParameterDescriptor> createValueParameterDescriptors(
      @NotNull ExpressionTypingContext context,
      @NotNull JetFunctionLiteral functionLiteral,
      @NotNull FunctionDescriptorImpl functionDescriptor,
      boolean functionTypeExpected) {
    List<ValueParameterDescriptor> valueParameterDescriptors = Lists.newArrayList();
    List<JetParameter> declaredValueParameters = functionLiteral.getValueParameters();

    List<ValueParameterDescriptor> expectedValueParameters =
        (functionTypeExpected)
            ? KotlinBuiltIns.getInstance()
                .getValueParameters(functionDescriptor, context.expectedType)
            : null;

    JetParameterList valueParameterList = functionLiteral.getValueParameterList();
    boolean hasDeclaredValueParameters = valueParameterList != null;
    if (functionTypeExpected
        && !hasDeclaredValueParameters
        && expectedValueParameters.size() == 1) {
      ValueParameterDescriptor valueParameterDescriptor = expectedValueParameters.get(0);
      ValueParameterDescriptor it =
          new ValueParameterDescriptorImpl(
              functionDescriptor,
              0,
              Collections.<AnnotationDescriptor>emptyList(),
              Name.identifier("it"),
              valueParameterDescriptor.getType(),
              valueParameterDescriptor.hasDefaultValue(),
              valueParameterDescriptor.getVarargElementType());
      valueParameterDescriptors.add(it);
      context.trace.record(AUTO_CREATED_IT, it);
    } else {
      if (expectedValueParameters != null
          && declaredValueParameters.size() != expectedValueParameters.size()) {
        List<JetType> expectedParameterTypes =
            DescriptorUtils.getValueParametersTypes(expectedValueParameters);
        context.trace.report(
            EXPECTED_PARAMETERS_NUMBER_MISMATCH.on(
                functionLiteral, expectedParameterTypes.size(), expectedParameterTypes));
      }
      for (int i = 0; i < declaredValueParameters.size(); i++) {
        ValueParameterDescriptor valueParameterDescriptor =
            createValueParameterDescriptor(
                context, functionDescriptor, declaredValueParameters, expectedValueParameters, i);
        valueParameterDescriptors.add(valueParameterDescriptor);
      }
    }
    return valueParameterDescriptors;
  }