// Minimal SSA Bug Reproduction with Loop
// Pattern: Conditional reassignment inside loop with immediate usage
// Expected: SSA violation "use of undefined value"

static box MinimalSSABugLoop {
  main(args) {
    local src = "using foo\nusing bar\n"
    local i = 0
    local n = src.length()

    loop(i < n) {
      local line = src.substring(i, i + 10)

      // Problem pattern: nested conditions with reassignment + immediate use
      if line.length() > 0 {
        line = line.substring(0, 5)     // reassign line
        if line.length() > 0 && line.substring(0, 1) == "u" {  // immediate use
          line = line.substring(1, 5)   // another reassign
          print(line)
        }
      }

      i = i + 10
    }

    return 0
  }
}
