Generic extending class AND implements interface in Kotlin

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Only one upper bound can be specified inside the angle brackets.

Kotlin offers different syntax for generic constraints when there is more than one constraint:

class Foo<T>(val t: T) where T : Bar, T : Baz { ... }

and for functions:

fun <T> f(): Foo where T : Bar, T : Baz { ... }

It is documented here.

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