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-Explanation: You can ❰merge❱ the alternatives of a union using a record with one
-handler per alternative, like this:
-
-
- ┌─────────────────────────────────────────────────────────────────────┐
- │ let union = < Left = +2 | Right : Bool > │
- │ in let handlers = { Left = Natural/even, Right = λ(x : Bool) → x } │
- │ in merge handlers union : Bool │
- └─────────────────────────────────────────────────────────────────────┘
-
-
-... as long as each handler is a function
-
-For example, the following expression is $_NOT valid:
-
-
- ┌─────────────────────────────────────────┐
- │ merge { Foo = True } < Foo = 1 > : Bool │
- └─────────────────────────────────────────┘
- ⇧
- Invalid: Not a function
-
-
-Your handler for this alternative:
-
-↳ $txt0
-
-... has the following type:
-
-↳ $txt1
-
-... which is not the type of a function