{
   "openapi": "3.0.0",
   "info": {
      "title": "test",
      "version": "v1"
   },
   "paths": {},
   "components": {
      "schemas": {
         "Foo": {
            "description": "Issue #915",
            "type": "object",
            "additionalProperties": {
               "$ref": "#/components/schemas/Foo"
            }
         }
      }
   }
}