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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 you must provide exactly one handler per alternative in the union. You
-cannot supply extra handlers
-
-For example, the following expression is $_NOT valid:
-
-
- ┌───────────────────────────────────────┐
- │ let union = < Left = +2 > │ The ❰Right❱ alternative is missing
- │ in let handlers = │
- │ { Left = Natural/even │
- │ , Right = λ(x : Bool) → x │ Invalid: ❰Right❱ handler isn't used
- │ } │
- │ in merge handlers union : Bool │
- └───────────────────────────────────────┘
-
-
-You provided the following handlers:
-
-↳ $txt0
-
-... which had no matching alternatives in the union you tried to ❰merge❱