File: t1163.check

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t1163.scala:2: error: overriding method foo in trait Sub of type => Sub;
 method foo in trait Super of type => Super has incompatible type;
 (Note that method foo in trait Sub of type => Sub is abstract,
  and is therefore overridden by concrete method foo in trait Super of type => Super)
trait Sub extends Super { override def foo: Sub }
      ^
one error found