Represents a form error.

It can either be:

• RequiredFieldIsEmpty, meaning that a required field is empty.
• ValidationFailed, meaning the field validation has failed. This type of error contains a String describing the validation error.

These type of errors are returned alongside each field in the Form.fill and Form.Base.fill functions.

You can easily write a simple function that turns this type into a String:

errorToString : Error -> String
errorToString error =
    case error of
        Error.RequiredFieldIsEmpty ->
            "this field is required"


        Error.ValidationFailed errorDescription ->
            errorDescription