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Explanation: Every union literal begins by selecting one alternative and
specifying the value for that alternative, like this:
Select the ❰Left❱ alternative, whose value is ❰True❱
⇩
┌──────────────────────────────────┐
│ < Left = True, Right : Natural > │ A union literal with two alternatives
└──────────────────────────────────┘
However, this value must be a term and not a type. For example, the following
values are $_NOT valid:
┌──────────────────────────────────┐
│ < Left = Text, Right : Natural > │ Invalid union literal
└──────────────────────────────────┘
⇧
This is a type and not a term
┌───────────────────────────────┐
│ < Left = Type, Right : Type > │ Invalid union type
└───────────────────────────────┘
⇧
This is a kind and not a term
You provided a union literal with an alternative named:
↳ $txt0
... whose value is:
↳ $txt1
... which is not a term
Some common reasons why you might get this error:
● You accidentally typed ❰=❱ instead of ❰:❱ for a union literal with one
alternative:
┌────────────────────┐
│ < Example = Text > │
└────────────────────┘
⇧
This could be ❰:❱ instead
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