similar to 166
Three different cases :
Foo f1 = new Foo();
f1.foo(li) prints Bonjour le monde
Foo f2 = new Bar();
f2.foo(li) prints Hello world
Foo.collection(Collection arg) -> Bar.collection(Collection arg) because of polymorphism
Bar b1 = new Bar();
b1.foo(li) prints Hello Mundo!
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