Inferred TypeName & TypeName fails the derivation

[andyczerwonka]

This could very well be a user error, so I apologize in advance, but I'm seeing a strange error during auto derivation that I can't seem to track down

Chimney can't derive transformation from theca.staging.model.Substance & theca.staging.model.Substance to theca.staging.model.grpcgen.Substance.

If we focus on the source, we see the error message is reporting two types with an & between them: theca.staging.model.Substance & theca.staging.model.Substance to theca.staging.model.grpcgen.Substance. The internal case class is a mirror of the grpcgen one, plus I have preserve_unknown_fields: false. I was expecting a trivial conversion.

I'm not quite tracking as to why we're seeing theca.staging.model.Substance & theca.staging.model.Substance instead of a single theca.staging.model.Substance. Has anyone run into this before?

[andyczerwonka]

Interesting... transformInto seems to work, so this is clearly user error

• self.into[pb.Substance].transform // generate the above compile-time error
• self.transformInto[pb.Substance] // works as expected

[MateuszKubuszok]

Is it possible to minimize the reproduction? Ideally as Scala CLI script?