Yes, you need parens, like:
let x : (int, string) Either = Left 42
You'll get an OCaml-compat warning using this syntax. Prefer Either<int,string>.
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I created a type
type Either<'a, 'b> =
| Left of 'a
| Right of 'b
I tried putting the generic types before the name without success:
type 'a 'b Either =...
or
type 'a, 'b Either =...
Is there a way to put more than one type before the type name?