FlatSpec examples using mixin-stacking / "withFixture" test setup are incorrect

[simlei]

On page http://www.scalatest.org/user_guide/sharing_fixtures#composingFixtures
(in section Composing fixtures by stacking traits)

The tutorial code does not compile.

trait Builder extends SuiteMixin { this: Suite =>

  val builder = new StringBuilder

  abstract override def withFixture(test: NoArgTest) = {
    builder.append("ScalaTest is ")
    try super.withFixture(test) // To be stackable, must call super.withFixture
    finally builder.clear()
  }
}
[...]

Errors:

[error] /home/simon/atomWorkspace/scala/scalabc/sub/ui/src/test/scala/scalabc/ui/UiTest.scala:17: not found: type NoArgTest
[error]   abstract override def withFixture(test: NoArgTest) = {
[error]                                           ^
[error] /home/simon/atomWorkspace/scala/scalabc/sub/ui/src/test/scala/scalabc/ui/UiTest.scala:19: value withFixture is not a member of org.scalatest.SuiteMixin
[error]     try super.withFixture(test) // To be stackable, must call super.withFixture
[error]               ^
[error] /home/simon/atomWorkspace/scala/scalabc/sub/ui/src/test/scala/scalabc/ui/UiTest.scala:28: not found: type NoArgTest
[error]   abstract override def withFixture(test: NoArgTest) = {
[error]                                           ^
[error] /home/simon/atomWorkspace/scala/scalabc/sub/ui/src/test/scala/scalabc/ui/UiTest.scala:29: value withFixture is not a member of org.scalatest.SuiteMixin

Solution:
http://www.scalatest.org/release_notes/3.0.0 states that you have to use TestSuiteXYZ everywhere

i.e. replace SuiteMixin with TestSuiteMixin, Suite with TestSuite.

Nontrivial to find the solution by googling, breaks

"Testing" should "be easy"
[...]
it should "be fun" in {
  beginToLearnScalatest()
}

Great website nonetheless! Quite good cheat sheets too!