ReScript 12 compatibility

[cknitt]

This may be a bit early as there is not even a first alpha version of ReScript 12 out yet, but I wanted to give you a heads-up already.

It seems something broke with rescript-lang/rescript-compiler#6611.

E.g., if I have a simple union schema

type x = A | B

let schema = S.union([S.literal(A), S.literal(B)])

then S.parseOrRaiseWith(JSON.String("B"), schema) gives me the error

Failed parsing at root. Reason: Expected "A", received "B"

on latest (ReScript) master.

[DZakh]

It seems something broke with rescript-lang/rescript-compiler#6611.

Oh, nice that it was merged. Yeah, that's probably the reason, since I do a dirty thing, to make RescriptSchemaError a valid Error instance and ReScript exception at the same time. I'll do a fix closer to the V12 release.

[cknitt]

12.0.0-alpha.1 is out now! 🎉

[cknitt]

I am also seeing the following error (without a line number) when using the PPX with 12.0.0-alpha.1:

  This uncurried function has type 'a => 'b
  It is applied with 2 arguments but it requires 1.

[DZakh]

Started the migration. I'm currently blocked by this rescript-lang/rescript-compiler#6929