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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 omit any handlers
-
-For example, the following expression is $_NOT valid:
-
-
- Invalid: Missing ❰Right❱ handler
- ⇩
- ┌─────────────────────────────────────────────────┐
- │ let handlers = { Left = Natural/even } │
- │ in let union = < Left = +2 | Right : Bool > │
- │ in merge handlers union : Bool │
- └─────────────────────────────────────────────────┘
-
-
-Note that you need to provide handlers for other alternatives even if those
-alternatives are never used
-
-You need to supply the following handlers:
-
-↳ $txt0