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

//! Tests that a struct with a `next` method but without the `Iterator` trait
//! implementation yields an error in a `for` loop.

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);
    }
}