// Phase 200-D: Simple digits capture test (Pattern 2 with break)
// This test verifies that captured variables (digits) work in JoinIR Pattern 2.
//
// Key constraints:
// - Loop condition uses only LoopParam (i) and OuterLocal (n)
// - Break condition uses outer-scoped variable (maxIter), NOT body-local
// - digits is captured and used in loop body

static box Main {
    main() {
        local digits = "0123456789"  // Captured var
        local s = "12"               // Input string

        local i = 0
        local v = 0
        local n = s.length()  // n = 2
        local maxIter = 10    // Safety limit (outer-scoped, not body-local)

        // Pattern 2: loop with break (break condition uses outer var)
        loop(i < n) {
            // Break if too many iterations (uses outer var, not body-local)
            if i > maxIter {
                break
            }

            local ch = s.substring(i, i + 1)
            local d = digits.indexOf(ch)  // digits: captured

            v = v * 10 + d
            i = i + 1
        }

        print(v)  // Expected: 12
    }
}