Maximum call stack size exceeded when generating Rust from large FHIR JSON Schema

[ocrickard]

Schema is attached, but comes from https://www.hl7.org/fhir/downloads.html. It's a very large healthcare data schema. I'm trying to generate Rust models:

$ quicktype -l rs -s schema --out schema.rs fhir.schema.json
Error: Maximum call stack size exceeded.

I found #855 and #715, but both are closed, and seem to be related to other languages.

Running Node v13.6.0 on macOS Catalina 10.15.2.

fhir.schema.json.zip

[wurstnudl]

The same happens when trying to generate dart code for the exact same schema file so it's probably not language dependent.

--no-enums doesn't help.

[ocrickard]

Ahhh yep, good point, just tried some other languages, none of them I've tried work.

[wurstnudl]

I think one of the problems is in the schema itself: Everything is an Element, Element has Extensions, and Extensions refers to Element. This smells a little bit like a possible cyclic dependency, couldn't really put my finger on how to resolve the problem really. But it would fit the stack overflow error.

[kyle-winkelman]

This appears to be related to #1407 and @Dokotela appears to have narrowed the issue down a bit.