Fix test

Author: odersky

tests/pos/i11214.scala

@@ -1,5 +1,5 @@
 trait Pet(val name: String)
 trait FeatheredPet extends Pet
 
-class Bird(name: String) extends FeatheredPet:
+class Bird(override val name: String) extends FeatheredPet:
    override def toString = s"bird name: $name"