[C#] Unable to build target: Could not process model '...' with allOf and enum

When using embedded Swagger Code Gen in Swagger Editor, trying to generate C# Client Code, I get an "could not process model" error. I located the error down, and it seems that the generator has a problem with properties using "allOf" and enums.

example:

swagger: '2.0'
info:
  version: 1.0.0
  title: Example API
  description: |
    blabla
  termsOfService: Copyright TEST eG - 2015
  contact:
    name: info@example.de
  license:
    name: Test eG
    url: www.Test.de  

host: localhost:58454
basePath: /test/api
schemes:
 - http
consumes:
 - application/json;charset=utf-8
produces:
 - application/json;charset=utf-8  

paths:

  /core/v1/test/:
    get:
      tags: 
        - 1 tester 
      summary: Test Summary 
      description: |



        descriptiontext

      responses:
        '200':
          description: Success.
          headers:
            RequestId:
              type: string
              description: Request id
          schema: 
            type: array
            items: 
              $ref: '#/definitions/allOfTest'


definitions:

  allOfTest:
    allOf: 
    - $ref: '#/definitions/referenceTest'
    type: object


  referenceTest:
    type: object
    properties:
      enum_type:
        type: string
        enum:
          - a
          - b
          - c
          - d
          - e
          - f
        description: | 
            descriptiontext

error:

Unable to build target: Could not process model 'allOfTest'

Details:

►  Object   

 code:  1 

 type:  "error" 

 message:  "Unable to build target: Could not process model 'allOfTest'" 

Start with embedded Swagger Code Gen's C# client generation and reproduce the failure using the supplied Swagger 2.0 definition, focusing on the allOfTest and referenceTest models. The work is done when the example generates a C# client without the 'Could not process model' error.