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Conditional composition selects a branch based on a condition. 
PC gate {
    fn gate(value) {
        if (value <= 0) {
            return 0;
        }

        return 1;
    }
}

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Review Points

  • Blocked cases are explicit.
  • Every branch returns.
  • Branches return compatible result kinds.
  • The final allowed path is visible.

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Review Guidance

Every branch must produce a defined result.