variance modifier wrapper function

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sometimes you need to write a function with the old function syntax (eg. to access super or to make a generator) but still want to leverage the variance checks that arrow functions have

something like

class Foo {
    foo = toArrowFunction(function() {
        super.foo()
    })
}

(idk if this will work)

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that example doesn't work because it needs to be a method not a function