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bug67.scala:15: constructor cannot be instantiated to expected type;
found : D.this.ITree[A?,B?]
required: D.this.InsertTree[A,B]
val ITree(t1) = insert_1(key, value, tree, s);
^
bug67.scala:19: no type parameters for method INode of type [A,B](D.this.Tree[A,B],scala.Int,scala.Int)D.this.INode[A,B] exist so that it can be applied to arguments (D.this.Tree[A,B],scala.Int,scala.Int)
--- because ---
result type D.this.INode[A,B] is incompatible with expected type D.this.InsertTree[A,B]
INode(t0,1,s);
^
two errors found
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