rust/tests/ui/for/for-loop-bogosity.rs

struct MyStruct {
    x: isize,
    y: isize,
}

impl MyStruct {
    fn next(&mut self) -> Option<isize> {
        Some(self.x)
    }
}

pub fn main() {
    let mut bogus = MyStruct {
        x: 1,
        y: 2,
    };
    for x in bogus {
    //~^ ERROR `MyStruct` is not an iterator
        drop(x);
    }
}
librustc: Stop desugaring `for` expressions and translate them directly. This makes edge cases in which the `Iterator` trait was not in scope and/or `Option` or its variants were not in scope work properly. This breaks code that looks like: struct MyStruct { ... } impl MyStruct { fn next(&mut self) -> Option<int> { ... } } for x in MyStruct { ... } { ... } Change ad-hoc `next` methods like the above to implementations of the `Iterator` trait. For example: impl Iterator<int> for MyStruct { fn next(&mut self) -> Option<int> { ... } } Closes #15392. [breaking-change] 2014-07-22 03:54:28 +00:00			`struct MyStruct {`
Update compile fail tests to use isize. 2015-01-08 10:54:35 +00:00			`x: isize,`
			`y: isize,`
librustc: Stop desugaring `for` expressions and translate them directly. This makes edge cases in which the `Iterator` trait was not in scope and/or `Option` or its variants were not in scope work properly. This breaks code that looks like: struct MyStruct { ... } impl MyStruct { fn next(&mut self) -> Option<int> { ... } } for x in MyStruct { ... } { ... } Change ad-hoc `next` methods like the above to implementations of the `Iterator` trait. For example: impl Iterator<int> for MyStruct { fn next(&mut self) -> Option<int> { ... } } Closes #15392. [breaking-change] 2014-07-22 03:54:28 +00:00			`}`

			`impl MyStruct {`
Update compile fail tests to use isize. 2015-01-08 10:54:35 +00:00			`fn next(&mut self) -> Option<isize> {`
librustc: Stop desugaring `for` expressions and translate them directly. This makes edge cases in which the `Iterator` trait was not in scope and/or `Option` or its variants were not in scope work properly. This breaks code that looks like: struct MyStruct { ... } impl MyStruct { fn next(&mut self) -> Option<int> { ... } } for x in MyStruct { ... } { ... } Change ad-hoc `next` methods like the above to implementations of the `Iterator` trait. For example: impl Iterator<int> for MyStruct { fn next(&mut self) -> Option<int> { ... } } Closes #15392. [breaking-change] 2014-07-22 03:54:28 +00:00			`Some(self.x)`
			`}`
			`}`

			`pub fn main() {`
			`let mut bogus = MyStruct {`
			`x: 1,`
			`y: 2,`
			`};`
Reword `rustc_on_unimplemented` errors for `Iterator` - Detect one element array of `Range` type, which is potentially a typo: `for _ in [0..10] {}` where iterating between `0` and `10` was intended. (#23141) - Suggest `.bytes()` and `.chars()` for `String`. - Suggest borrowing or `.iter()` on arrays (#36391) - Suggest using range literal when iterating on integers (#34353) - Do not suggest `.iter()` by default (#50773, #46806) 2018-10-10 01:53:53 +00:00			`for x in bogus {`
			//~^ ERROR `MyStruct` is not an iterator
librustc: Stop desugaring `for` expressions and translate them directly. This makes edge cases in which the `Iterator` trait was not in scope and/or `Option` or its variants were not in scope work properly. This breaks code that looks like: struct MyStruct { ... } impl MyStruct { fn next(&mut self) -> Option<int> { ... } } for x in MyStruct { ... } { ... } Change ad-hoc `next` methods like the above to implementations of the `Iterator` trait. For example: impl Iterator<int> for MyStruct { fn next(&mut self) -> Option<int> { ... } } Closes #15392. [breaking-change] 2014-07-22 03:54:28 +00:00			`drop(x);`
			`}`
			`}`