The thing is, `subscribe` expects a function that ...

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[okkero]

The thing is, subscribe expects a function that either takes one parameter of some type T, or has a receiver of some type T and takes 0 parameters. When you do Foo::stuff you get a function with a receiver of type Foo that takes no parameters. So this satisfies the requirement. However, when you do this::stuff you have sort of partially applied the function, and what you get is actually a function that with no receiver that takes no parameters. This does not satisfy the requirement. Therefore this::stuff isn't even a valid argument to subscribe