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fn takes_imm(x: &isize) { }
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fn takes_mut(x: &mut isize) { }
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fn apply<T, F>(t: T, f: F) where F: FnOnce(T) {
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f(t)
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}
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fn main() {
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apply(&3, takes_imm);
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apply(&3, takes_mut);
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//~^ ERROR type mismatch
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apply(&mut 3, takes_mut);
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apply(&mut 3, takes_imm);
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//~^ ERROR type mismatch
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}
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