Explanation: Unions may not have two alternatives that share the same name

For example, the following expressions are $_NOT valid:


    ┌─────────────────────────────┐
    │ < foo = True | foo : Text > │  Invalid: ❰foo❱ appears twice
    └─────────────────────────────┘


    ┌───────────────────────────────────────┐
    │ < foo = 1 | bar : Bool | bar : Text > │  Invalid: ❰bar❱ appears twice
    └───────────────────────────────────────┘


You have more than one alternative named:

↳ $txt0