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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 first argument to ❰merge❱ must be a record and not some other type.
-
-For example, the following expression is $_NOT valid:
-
-
- ┌─────────────────────────────────────────┐
- │ let handler = λ(x : Bool) → x │
- │ in merge handler < Foo = True > : True │
- └─────────────────────────────────────────┘
- ⇧
- Invalid: ❰handler❱ isn't a record
-
-
-You provided the following handler:
-
-↳ $txt0
-
-... which is not a record, but is actually a value of type:
-
-↳ $txt1
-
-Some common reasons why you might get this error:
-
-● You accidentally provide an empty record type instead of an empty record when
- you ❰merge❱ an empty union:
-
-
- ┌──────────────────────────────────────────┐
- │ λ(x : <>) → λ(a : Type) → merge {} x : a │
- └──────────────────────────────────────────┘
- ⇧
- This should be ❰{=}❱ instead