I opened an issue in the GitHub repo as it was reproduced at #head. [https://github.com/dom96/jester/issues/211](https://github.com/dom96/jester/issues/211)
The above code is a minimal one to demonstrate the problem. I'm coding API generator for Jester, and I need to define some routers in separated files, then I found the issue. The below are sample codes (it's still WIP). [https://github.com/hokamoto/openapi-generator/tree/nimforum5196/samples/server/petstore/nim-jester-server](https://github.com/hokamoto/openapi-generator/tree/nimforum5196/samples/server/petstore/nim-jester-server)
