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// run-pass
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#![allow(unused_assignments)]
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#![allow(unknown_lints)]
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// pretty-expanded FIXME #23616
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#![allow(unused_variables)]
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#![allow(dead_assignment)]
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fn f(u: ()) { return u; }
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pub fn main() {
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let u1: () = ();
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let mut u2: () = f(u1);
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u2 = ();
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return ();
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}
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