[rustc.git] / src / test / ui / rfc-2005-default-binding-mode / borrowck-issue-49631.rs

#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Foo {
}

impl Foo {
    fn get(&self) -> Option<&Result<String, String>> {
        None
    }

    fn mutate(&mut self) { }
}

fn main() {
    let mut foo = Foo { };

    // foo.get() returns type Option<&Result<String, String>>, so
    // using `string` keeps borrow of `foo` alive. Hence calling
    // `foo.mutate()` should be an error.
    while let Some(Ok(string)) = foo.get() {
        foo.mutate();
        //~^ ERROR cannot borrow `foo` as mutable
        println!("foo={:?}", *string);
    }
}
Commit	Line	Data
0531ce1d XL	1	#[derive(Copy, Clone, Debug, Eq, PartialEq)]
	2	pub struct Foo {
	3	}
	4
	5	impl Foo {
	6	fn get(&self) -> Option<&Result<String, String>> {
	7	None
	8	}
	9
	10	fn mutate(&mut self) { }
	11	}
	12
	13	fn main() {
	14	let mut foo = Foo { };
	15
	16	// foo.get() returns type Option<&Result<String, String>>, so
	17	// using `string` keeps borrow of `foo` alive. Hence calling
	18	// `foo.mutate()` should be an error.
	19	while let Some(Ok(string)) = foo.get() {
	20	foo.mutate();
	21	//~^ ERROR cannot borrow `foo` as mutable
	22	println!("foo={:?}", *string);
	23	}
	24	}