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#![allow(dead_code)]
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fn foo<F: Fn()>(mut f: F) {
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f.call(()); //~ ERROR use of unstable library feature 'fn_traits'
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f.call_mut(()); //~ ERROR use of unstable library feature 'fn_traits'
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f.call_once(()); //~ ERROR use of unstable library feature 'fn_traits'
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}
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fn main() {}
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