Variant constructor

const Variant({
  1. required VariantKey key,
  2. required Pattern value,
  3. required bool isDefault,
  4. Span? span,
})

Bundles one variant's key, value pattern, and default flag.

Implementation

const Variant({
  required this.key,
  required this.value,
  required this.isDefault,
  this.span,
});