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idnatest A4_2 for empty root label #826

Closed markusicu closed 6 months ago

markusicu commented 6 months ago

[179-A121] Action Item for Mark Davis, PAG: Review IdnaTestV2.txt and its generator code for setting appropriate error codes for VerifyDnsLength=true. For Unicode Version 16.0. See document L2/24-064 item 6.3.

In principle, the last label could be the optional empty root label, but we generate test data with VerifyDnsLength=true, and since Unicode 15.0 UTS46 says: “When VerifyDnsLength is true, the empty root label is disallowed.”