diff options
Diffstat (limited to 'src/test/ui/closures/2229_closure_analysis/run_pass/multilevel-path-1.rs')
-rw-r--r-- | src/test/ui/closures/2229_closure_analysis/run_pass/multilevel-path-1.rs | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/test/ui/closures/2229_closure_analysis/run_pass/multilevel-path-1.rs b/src/test/ui/closures/2229_closure_analysis/run_pass/multilevel-path-1.rs new file mode 100644 index 000000000..b8e464031 --- /dev/null +++ b/src/test/ui/closures/2229_closure_analysis/run_pass/multilevel-path-1.rs @@ -0,0 +1,33 @@ +// edition:2021 +// run-pass + +// Test that closures can catpure paths that are more precise than just one level +// from the root variable. +// +// If the closures can handle such precison we should be able to mutate one path in the closure +// while being able to mutate another path outside the closure, where the two paths are disjoint +// after applying two projections on the root variable. + +#![allow(unused)] + +struct Point { + x: i32, + y: i32, +} +struct Wrapper { + p: Point, +} + +fn main() { + let mut w = Wrapper { p: Point { x: 10, y: 10 } }; + + let mut c = || { + w.p.x += 20; + }; + + // `c` only captures `w.p.x`, therefore it's safe to mutate `w.p.y`. + let py = &mut w.p.y; + c(); + + *py = 20 +} |