Description:
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While I know it should not be possible to have a trait extend another trait, the 
error message is confusing, stating that you are trying to extend a class.

I understand that "use" is the correct answer to the problem the script is trying 
to solve.

Test script:
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<?php
trait Foo { }

trait Bar extends Foo { }

Expected result:
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Fatal error: A trait (Bar) cannot extend a trait (Foo) in ...

Better yet:

Fatal error: A trait (Bar) cannot extend a trait (Foo), use "use" instead in ...

or some such.

Actual result:
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Fatal error: A trait (Bar) cannot extend a class in ...