rust/tests/ui/borrowck/borrowck-partial-reinit-3.rs

use std::mem;

struct Test { f: usize }
impl Drop for Test {
    fn drop(&mut self) {}
}

fn main() {
    let mut x = (Test { f: 2 }, Test { f: 4 });
    mem::drop(x.0);
    x.0.f = 3;
    //~^ ERROR assign of moved value: `x.0`
}
librustc: Forbid partial reinitialization of uninitialized structures or enumerations that implement the `Drop` trait. This breaks code like: struct Struct { f: String, g: String, } impl Drop for Struct { ... } fn main() { let x = Struct { ... }; drop(x); x.f = ...; } Change this code to not create partially-initialized structures. For example: struct Struct { f: String, g: String, } impl Drop for Struct { ... } fn main() { let x = Struct { ... }; drop(x); x = Struct { f: ..., g: ..., } } Closes #18571. [breaking-change] ---- (Joint authorship by pcwalton and Ryman; thanks all!) 2014-11-14 23:14:52 +00:00			`use std::mem;`

			`struct Test { f: usize }`
			`impl Drop for Test {`
			`fn drop(&mut self) {}`
			`}`

			`fn main() {`
			`let mut x = (Test { f: 2 }, Test { f: 4 });`
			`mem::drop(x.0);`
			`x.0.f = 3;`
update tests for migrate mode by default 2019-04-22 07:40:08 +00:00			//~^ ERROR assign of moved value: `x.0`
librustc: Forbid partial reinitialization of uninitialized structures or enumerations that implement the `Drop` trait. This breaks code like: struct Struct { f: String, g: String, } impl Drop for Struct { ... } fn main() { let x = Struct { ... }; drop(x); x.f = ...; } Change this code to not create partially-initialized structures. For example: struct Struct { f: String, g: String, } impl Drop for Struct { ... } fn main() { let x = Struct { ... }; drop(x); x = Struct { f: ..., g: ..., } } Closes #18571. [breaking-change] ---- (Joint authorship by pcwalton and Ryman; thanks all!) 2014-11-14 23:14:52 +00:00			`}`