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//@ check-pass
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union URes<R: Copy> {
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uninit: (),
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init: R,
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}
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struct Params<F, R: Copy> {
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function: F,
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result: URes<R>,
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}
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unsafe extern "C" fn do_call<F, R>(params: *mut Params<F, R>)
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where
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R: Copy,
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F: Fn() -> R,
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{
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(*params).result.init = ((*params).function)();
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}
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fn main() {}
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