mirror of https://github.com/rust-lang/rust
18 lines
428 B
Rust
18 lines
428 B
Rust
fn a<F:Fn(isize, isize) -> isize>(mut f: F) {
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let g = &mut f;
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f(1, 2); //~ ERROR cannot borrow `f` as immutable
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use_mut(g);
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}
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fn b<F:FnMut(isize, isize) -> isize>(f: F) {
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f(1, 2); //~ ERROR cannot borrow `f` as mutable, as it is not declared as mutable
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}
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fn c<F:FnOnce(isize, isize) -> isize>(f: F) {
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f(1, 2);
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f(1, 2); //~ ERROR use of moved value
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}
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fn main() {}
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fn use_mut<T>(_: &mut T) { }
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