Code-quality rules an AI breaks: the wrong forms

The complete source of forAI_quality_wrong.ek9, which fails to compile exactly as captioned. Shown on forAI.html.

Fails with E11068: string concatenation with 3+ parts - use string interpolation instead; E11062: call has 4+ positional arguments - use named arguments for clarity; E11064: literal in comparison/range - give it a meaningful name; E11032: variable name shadows operator keyword - use a more specific name; E11051: pure method/function returns a value but result is discarded - a pure call with no side effects achieves nothing; E11050: operator returns a value but result is discarded - assign to variable or use in expression

#!ek9
defines module bad.site.forAI.quality

  defines function

    createConnection()
      ->
        host as String
        port as Integer
        dbName as String
        ssl as Boolean
      <- connected as Boolean: host? and port? and dbName? and ssl?

    lockAccount()
      Stdout().println("Account locked")

    findAll() as pure
      ->
        pattern as RegEx
        text as String
      <- found as List of String: text.split(pattern)

    checkIfEmpty() as pure
      -> container as List of String
      <- isEmpty as Boolean: container.empty()

    calculateTotal() as pure
      -> items as List of Float
      <- total as Float: 0.0
      cat items > total

    welcome()
      ->
        name as String
        city as String
      <- greeting as String?
      message <- "Hello " + name + ", welcome to " + city
      greeting: message

    connect()
      <- connected as Boolean?
      connection <- createConnection("localhost", 5432, "mydb", true)
      connected: connection

    guardLogin()
      -> attempts as Integer
      if attempts > 3
        lockAccount()

    search()
      ->
        pattern as RegEx
        text as String
        container as List of String
      <- summary as String?
      matches <- findAll(pattern, text)
      empty <- checkIfEmpty(container)
      summary: `${matches} ${empty}`

    addTax()
      ->
        items as List of Float
        price as Float
        tax as Float
      calculateTotal(items)
      price.+(tax)

Download forAI_quality_wrong.ek9 - it fails to compile on purpose, with the error its @Error line states.