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Separator DSL methods produce incorrect lookahead / possible tokens

Separator DSL methods produce incorrect lookahead / possible tokens: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). When a rule uses the separator variants of the repetition DSL methods ( MANY SEP / AT LEAST ONE SEP ), the computation of the possible next tokens /…

The task

When a rule uses the separator variants of the repetition DSL methods (`MANY_SEP` / `AT_LEAST_ONE_SEP`), the computation of the possible next tokens / lookahead paths gives wrong results.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.