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If all migrations are defined in a `migrations { ... }` block, we can validate for
completeness on block exit, and raise a NoPathError if a version is missing.
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Adds a mechanism for verifying that migrations aren't missed: if all migrations are defined in a
migrations { ... }block, and we add ano_migration!to declare an intentionally absent version, then we can validate for completeness on block exit, and raise a NoPathError if any version is undeclared.