34 lines
727 B
Rust
34 lines
727 B
Rust
// edition:2021
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// run-pass
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// Test that closures can capture paths that are more precise than just one level
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// from the root variable.
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//
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// If the closures can handle such precision we should be able to mutate one path in the closure
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// while being able to mutate another path outside the closure, where the two paths are disjoint
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// after applying two projections on the root variable.
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#![allow(unused)]
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struct Point {
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x: i32,
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y: i32,
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}
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struct Wrapper {
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p: Point,
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}
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fn main() {
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let mut w = Wrapper { p: Point { x: 10, y: 10 } };
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let mut c = || {
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w.p.x += 20;
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};
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// `c` only captures `w.p.x`, therefore it's safe to mutate `w.p.y`.
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let py = &mut w.p.y;
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c();
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*py = 20
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}
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