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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 │
- └─────────────────────────────────────────────────────────────────────┘
-
-
-... but the second argument to ❰merge❱ must be a union and not some other type.
-
-For example, the following expression is $_NOT valid:
-
-
- ┌──────────────────────────────────────────┐
- │ let handlers = { Foo = λ(x : Bool) → x } │
- │ in merge handlers True : True │
- └──────────────────────────────────────────┘
- ⇧
- Invalid: ❰True❱ isn't a union
-
-
-You tried to ❰merge❱ this expression:
-
-↳ $txt0
-
-... which is not a union, but is actually a value of type:
-
-↳ $txt1