mirror of https://github.com/rust-lang/rust
43 lines
764 B
Rust
43 lines
764 B
Rust
//@ run-pass
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// Tests that the scope of the pointer returned from `get()` is
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// limited to the deref operation itself, and does not infect the
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// block as a whole.
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struct Box {
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x: usize
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}
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impl Box {
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fn get(&self) -> &usize {
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&self.x
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}
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fn set(&mut self, x: usize) {
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self.x = x;
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}
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}
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fn fun1() {
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// in the past, borrow checker behaved differently when
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// init and decl of `v` were distinct
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let v;
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let mut a_box = Box {x: 0};
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a_box.set(22);
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v = *a_box.get();
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a_box.set(v+1);
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assert_eq!(23, *a_box.get());
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}
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fn fun2() {
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let mut a_box = Box {x: 0};
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a_box.set(22);
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let v = *a_box.get();
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a_box.set(v+1);
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assert_eq!(23, *a_box.get());
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}
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pub fn main() {
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fun1();
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fun2();
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}
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