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Interpolation of Field Names

String interpolations may also be used in field names.

One cannot refer to generated fields with references.

sandwich: {
    type:            "Cheese"
    "has\(type)":    true
    hasButter:       true
    butterAndCheese: hasButter && hasCheese
}

sandwich: {
    type:            "Cheese"
    hasCheese:       true
    hasButter:       true
    butterAndCheese: _|_ // unknown reference 'hasCheese'
}