[BUG][rust] oneOf array enums produce invalid syntax for generated object types

[rgroothuijsen]

Description

This is a continuation of #21599 which fixed arrays in enums for primitive types, but syntax errors still arise for generated types as pointed out in this comment. Instead of enum values like ArrayVecString(Vec<String>), it will produce values like ArrayVecmodels::TestObject(Vec<models::TestObject>), where the first set of double colons produces the problem.

openapi-generator version

7.21.0

OpenAPI declaration file content or url

openapi: 3.1.0
info:
  title: oneOf with object arrays
  description: Support object types in oneOf array enums.
  version: 1.0.0
components:
  schemas:
    ObjectArrays:
      type: object
      properties:
        Options:
          oneOf:
            - type: array
              items:
                $ref: '#/components/schemas/TestObject'
            - type: array
              items:
                $ref: '#/components/schemas/TestArray'
    TestObject:
      type: object
      properties:
        test:
          type: string
    TestArray:
      properties:
        test:
          type: array
          items:
            type: string

Steps to reproduce

Run the Rust client generator with default settings and the above YAML file.

Suggest a fix

Since I'm already looking into this, I'll create a PR for it.