[GO] Invalid code generated when specifying the "Any Type"

Description

The specification says I am able to declare an "any" type which should match any possible type. E.g. values in a JSON object.

The resulting code references Object, which is undefined and won't compile.

Swagger-codegen version

3.0.26

Swagger declaration file content or url

openapi: 3.0.0
info:
  title: Hello
  version: 1.0.0
components:
  schemas:
    AnyValue: {}
    MyObject:
      type: object
      properties:
        myField:
          $ref: '#/components/schemas/AnyValue'
paths: {}

Command line used for generation

swagger-codegen generate -i swagger.yaml -l go -o swagger

Steps to reproduce

1. Run the CLI as stated above
2. Attempt to use:

➜  go run .
# myproject
swagger/model_my_object.go:12:11: undefined: Object

Furthermore inspect the code for model_my_object.go:

/*
 * Hello
 *
 * No description provided (generated by Swagger Codegen https://github.com/swagger-api/swagger-codegen)
 *
 * API version: 1.0.0
 * Generated by: Swagger Codegen (https://github.com/swagger-api/swagger-codegen.git)
 */
package swagger

type MyObject struct {
	MyField *Object `json:"myField,omitempty"`
}

Related issues/PRs

Suggest a fix/enhancement

Run the stated swagger-codegen generate -i swagger.yaml -l go -o swagger command and inspect model_my_object.go, focusing on how the empty AnyValue schema becomes the MyField type. Trace that generated type through the Go generator entry point and its templates, then verify that the generated package compiles and accepts arbitrary JSON values.