19 lines
314 B
Rust
19 lines
314 B
Rust
fn borrow<F>(v: &isize, f: F) where F: FnOnce(&isize) {
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f(v);
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}
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fn box_imm() {
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let mut v: Box<_> = Box::new(3);
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borrow(&*v,
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|w| { //~ ERROR cannot borrow `v` as mutable
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v = Box::new(4);
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assert_eq!(*v, 3);
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assert_eq!(*w, 4);
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})
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}
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fn main() {
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}
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