OCaml and Scala, both also famously strongly typed functional languages, also have structural typing (OCaml even has many different kinds at many different levels!). Mainstream, Go is based on structural (interface) typing.
The Person/Wine example is a pointless strawman. That's not what structural typing is generally used for.
The entire comment is basically making up strawmans...
I didn't give practical examples to save space, obviously, it was just to disambiguate what I meant.
TypeScript has several runtime-safe advanced validators based on its type system (most well-known being Zod), capable of enforcing types similar to what I provided.
To conclude, these type system features were added by multiple experienced language designers for a reason, to languages that already had functional ADTs, so going "huh but what are these even useful for?!" to me sounds a bit clueless (or argumentative), so I don't see a productive continuation to this discussion.
The Person/Wine example is a pointless strawman. That's not what structural typing is generally used for.
The entire comment is basically making up strawmans... I didn't give practical examples to save space, obviously, it was just to disambiguate what I meant.
TypeScript has several runtime-safe advanced validators based on its type system (most well-known being Zod), capable of enforcing types similar to what I provided.
To conclude, these type system features were added by multiple experienced language designers for a reason, to languages that already had functional ADTs, so going "huh but what are these even useful for?!" to me sounds a bit clueless (or argumentative), so I don't see a productive continuation to this discussion.