Slick implicit parameter 'tables' with generated tables

The simple version

What's the preferred way to import and use generated Slick tables?

The detailed version and what I've tried

I used Slick 3.1.1 codegen to generate a Tables.scala from a MySQL (MariaDB) schema.

Tables.scala begins with this:

// AUTO-GENERATED Slick data model
/** Stand-alone Slick data model for immediate use */
object Tables extends {
    val profile = slick.driver.MySQLDriver
} with Tables

What's the best way to use these classes? As per the Slick documentation:

The file contains an object Tables from which the code can be imported for use right away. ... The file also contains a trait Tables which can be used in the cake pattern.

... I've tried variations on this example

import Tables._
import Tables.profile.api._
import slick.jdbc.JdbcBackend

class Test(s: String)(implicit db: Database) {
    def exec[T](action: DBIO[T])(implicit db: Database): T =
            Await.result(db run action)
    def run: Unit = exec(((ATable filter (_.id)).result)
}
object Test {
    implicit val db = Database.forURL(url, user, password)
    new Test("")
}

I get a compile error wherever I reference the class ATable:

could not find implicit value for parameter tables: Tables

I don't even see tables in Tables.scala. How do I get everything I need in scope to use my generated Slick classes?

I got the example to work: Tables._ and Tables.profile.api._ just need to be imported inside the class with an implicit Database available.

import slick.jdbc.JdbcBackend

class Test(s: String)(implicit db: Database) {
    import Tables._
    import Tables.profile.api._

    def exec[T](action: DBIO[T])(implicit db: Database): T =
            Await.result(db run action)
    def run: Unit = exec(((ATable filter (_.id)).result)
}
object Test {
    implicit val db = Database.forURL(url, user, password)
    new Test("")
}