// Phase 212: Pattern 1 + Pattern 3 (IfPHI) test - if-sum implementation
// Tests: Loop with conditional update inside if block
// Target: selfhost if-sum pattern (e.g., FuncScannerBox._sum_def_count)
//
// Expected behavior:
//   Array [null-equivalent, "a", "b"] → sum counts non-empty strings
//   Empty string "" treated as null-equivalent → skip
//   "a", "b" are valid → sum = 2
//
// Expected result: 2 (count of valid items)

static box IfSumTest {
    sum_def_count(defs) {
        local sum
        sum = 0
        local i
        i = 0
        local len
        len = 3

        loop(i < len) {
            // ArrayBox.get equivalent (simplified: use index directly)
            // In real code: local item = defs.get(i)
            // For Phase 212: simulate with positional check

            // Simulate: [empty, "a", "b"]
            //   i=0 → empty (skip)
            //   i=1 → "a" (count)
            //   i=2 → "b" (count)

            if i > 0 {
                // Conditional update: sum = sum + 1
                sum = sum + 1
                print(sum)  // ← Force if to stay in MIR
            } else {
                print(0)  // ← Ensure else branch exists
            }

            i = i + 1
        }

        return sum
    }

    main() {
        // Array: [empty, "a", "b"] → sum=2
        // (simplified without actual ArrayBox for Phase 212)
        local result
        result = IfSumTest.sum_def_count(0)  // dummy arg
        return result
    }
}