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schema.spec.variant
variant-specclj/s
(variant-spec pre options)(variant-spec pre options err-f)(variant-spec pre options err-f post)A variant spec represents a choice between a set of alternative subschemas, e.g., a tagged union. It has an overall precondition, set of options, and error function.
The semantics of options is that the options are processed in
order. During checking, the datum must match the schema for the
first option for which guard passes. During generation, any datum
generated from an option will pass the corresponding guard.
err-f is a function to produce an error message if none of the guards match (and must be passed unless the last option has no guard).
A variant spec represents a choice between a set of alternative subschemas, e.g., a tagged union. It has an overall precondition, set of options, and error function. The semantics of `options` is that the options are processed in order. During checking, the datum must match the schema for the first option for which `guard` passes. During generation, any datum generated from an option will pass the corresponding `guard`. err-f is a function to produce an error message if none of the guards match (and must be passed unless the last option has no guard).
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