// Phase 74-SSA: Minimal reproduction of static box delegation bug
// Goal: Reproduce ValueId undef caused by box → static box delegation
//
// Pattern: box A delegates to static box B (matches ParserBox → ParserStringUtilsBox)
// Expected bug: ValueId mapping fails for arguments in delegation

static box TargetBox {
  is_digit(ch) {
    if ch >= "0" && ch <= "9" { return 1 }
    return 0
  }
}

box DelegateBox {
  // Non-static box delegating to static box (matches ParserBox pattern)
  is_digit(ch) {
    // This delegation should cause SSA undef (ValueId mapping failure)
    return TargetBox.is_digit(ch)
  }

  birth() {
    return 0
  }
}

box Main {
  main() {
    local delegate = new DelegateBox()
    local ch = "7"
    // Call through delegation
    local d = delegate.is_digit(ch)
    // Use result to avoid SSA dead code elimination
    if d == 1 { return 0 }
    return 1
  }
}