For the code below abstract class A { type B <: C abstract class C { def superClassM(b: B): D } class EImpl extends C { def superClassM(b: B): D = { val e = func1(this, b) e } } def func1(b: B, b1: B): D = D(b, b1) case class D(a: B, b: B) } The code produces the following compile error found : EImpl.this.type (with underlying type A.this.EImpl) required: A.this.B val e = func1(this, b) ^

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