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Explanation: You can only access fields on records, like this:
┌─────────────────────────────────┐
│ { foo = True, bar = "ABC" }.foo │ This is valid ...
└─────────────────────────────────┘
┌───────────────────────────────────────────┐
│ λ(r : { foo : Bool, bar : Text }) → r.foo │ ... and so is this
└───────────────────────────────────────────┘
... but you can only access fields if they are present
For example, the following expression is $_NOT valid:
┌─────────────────────────────────┐
│ { foo = True, bar = "ABC" }.qux │
└─────────────────────────────────┘
⇧
Invalid: the record has no ❰qux❱ field
You tried to access a field named:
↳ $txt0
... but the field is missing because the record only defines the following fields:
↳ $txt1
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