Function std::intrinsics::const_eval_select_ct

pub unsafe fn const_eval_select_ct<ARG, F, G, RET>(
    arg: ARG, 
    called_in_const: F, 
    _called_at_rt: G
) -> RET where
    F: FnOnce<ARG, Output = RET>,
    G: FnOnce<ARG, Output = RET> + Drop, 

🔬 This is a nightly-only experimental API. (const_eval_select)