Compiler optimizations with generics

c#
public interface Isome<T> where T: ISomeOther
{
   T Foo();
}
//vs

public interface ISome
{
  ISomeOther Bar();
}


public class A : ISome<SomeOther> //where SomeOther : ISomeOther
{
  SomeOther Foo();
}
//vs

public class B : ISome
{
  SomeOther Bar(); //where SomeOther : ISomeOther
}

c#
public interface Isome<T> where T: ISomeOther
{
   T Foo();
}
//vs

public interface ISome
{
  ISomeOther Bar();
}


public class A : ISome<SomeOther> //where SomeOther : ISomeOther
{
  SomeOther Foo();
}
//vs

public class B : ISome
{
  SomeOther Bar(); //where SomeOther : ISomeOther
}