If I have classes that implement interface `Foo`, ...

# getting-started

[Johan Alkstål]

If I have classes that implement interface Foo, when making a List<Foo> should be possible without casting the classes to their interface type?
When I do

fun listOfFoos(): List<Foo> {
    return listOf(
        FooA(),
        FooB(),
        FooC()
    )
}

it complains that each class is not a Foo but a FooA FooB and FooC.
I would have thought that since they all implement the interface Foo it would just work?

[Ruckus]

It works fine for me: https://pl.kotl.in/g0AugAM0G

[Johan Alkstål]

Doesn't compile for me. 😕
Type mismatch: inferred type is FooA but expected Foo

[Johan Alkstål]

Okay now it suddenly did.