// Phase 29ab P1: Pattern2 LoopBodyLocal promotion minimal case
//
// Goal:
// - Break condition uses LoopBodyLocal (digit_pos) that must be promoted
// - JoinIR -> merge path should handle A-4 DigitPos promotion
//
// Expected (before fix): FAIL/out-of-scope
// Expected (after fix): prints "2" and returns 2

static box Main {
    main() {
        local s = "12a"
        local digits = "0123456789"
        local p = 0

        loop(p < s.length()) {
            local ch = s.substring(p, p + 1)
            local digit_pos = digits.indexOf(ch)

            if digit_pos < 0 {
                break
            }

            p = p + 1
        }

        print(p)
        return p
    }
}