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-Explanation: Every ❰if❱ expression has a ❰then❱ and ❰else❱ branch, each of which
-is an expression:
-
-
- Expression for ❰then❱ branch
- ⇩
- ┌────────────────────────────────┐
- │ if True then "Hello, world!" │
- │ else "Goodbye, world!" │
- └────────────────────────────────┘
- ⇧
- Expression for ❰else❱ branch
-
-
-These two expressions must have the same type. For example, the following ❰if❱
-expressions are all valid:
-
-
- ┌──────────────────────────────────┐
- │ λ(b : Bool) → if b then 0 else 1 │ Both branches have type ❰Integer❱
- └──────────────────────────────────┘
-
-
- ┌────────────────────────────┐
- │ λ(b : Bool) → │
- │ if b then Natural/even │ Both branches have type ❰Natural → Bool❱
- │ else Natural/odd │
- └────────────────────────────┘
-
-
-However, the following expression is $_NOT valid:
-
-
- This branch has type ❰Integer❱
- ⇩
- ┌────────────────────────┐
- │ if True then 0 │
- │ else "ABC" │
- └────────────────────────┘
- ⇧
- This branch has type ❰Text❱
-
-
-The ❰then❱ and ❰else❱ branches must have matching types, even if the predicate is
-always ❰True❱ or ❰False❱
-
-Your ❰if❱ expression has the following ❰then❱ branch:
-
-↳ $txt0
-
-... which has type:
-
-↳ $txt2
-
-... and the following ❰else❱ branch:
-
-↳ $txt1
-
-... which has a different type:
-
-↳ $txt3
-
-Fix your ❰then❱ and ❰else❱ branches to have matching types