diff options
Diffstat (limited to 'src/test/ui/closures/2229_closure_analysis/diagnostics/box.rs')
-rw-r--r-- | src/test/ui/closures/2229_closure_analysis/diagnostics/box.rs | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/test/ui/closures/2229_closure_analysis/diagnostics/box.rs b/src/test/ui/closures/2229_closure_analysis/diagnostics/box.rs new file mode 100644 index 000000000..a110fa4e2 --- /dev/null +++ b/src/test/ui/closures/2229_closure_analysis/diagnostics/box.rs @@ -0,0 +1,64 @@ +// edition:2021 + +// Test borrow checker when we precise capture when using boxes + +struct MetaData { x: String, name: String } +struct Data { m: MetaData } +struct BoxedData(Box<Data>); +struct EvenMoreBoxedData(Box<BoxedData>); + +// Check diagnostics when the same path is mutated both inside and outside the closure +fn box_1() { + let m = MetaData { x: format!("x"), name: format!("name") }; + let d = Data { m }; + let b = BoxedData(Box::new(d)); + let mut e = EvenMoreBoxedData(Box::new(b)); + + let mut c = || { + e.0.0.m.x = format!("not-x"); + }; + + e.0.0.m.x = format!("not-x"); + //~^ ERROR: cannot assign to `e.0.0.m.x` because it is borrowed + c(); +} + +// Check diagnostics when a path is mutated inside a closure while attempting to read it outside +// the closure. +fn box_2() { + let m = MetaData { x: format!("x"), name: format!("name") }; + let d = Data { m }; + let b = BoxedData(Box::new(d)); + let mut e = EvenMoreBoxedData(Box::new(b)); + + let mut c = || { + e.0.0.m.x = format!("not-x"); + }; + + println!("{}", e.0.0.m.x); + //~^ ERROR: cannot borrow `e.0.0.m.x` as immutable because it is also borrowed as mutable + c(); +} + +// Check diagnostics when a path is read inside a closure while attempting to mutate it outside +// the closure. +fn box_3() { + let m = MetaData { x: format!("x"), name: format!("name") }; + let d = Data { m }; + let b = BoxedData(Box::new(d)); + let mut e = EvenMoreBoxedData(Box::new(b)); + + let c = || { + println!("{}", e.0.0.m.x); + }; + + e.0.0.m.x = format!("not-x"); + //~^ ERROR: cannot assign to `e.0.0.m.x` because it is borrowed + c(); +} + +fn main() { + box_1(); + box_2(); + box_3(); +} |