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SmallVec::insert is UB on large arguments #343

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@workingjubilee

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@workingjubilee

This example fails in miri, you can try it on the Playground:

fn main() {
    use smallvec::{smallvec, SmallVec};

    // This SmallVec can hold up to 4 items on the stack:
    let mut v: SmallVec<[i32; 4]> = smallvec![1, 2, 3, 4];

    // It will automatically move its contents to the heap if
    // contains more than four items:
    v.push(5);

    // SmallVec points to a slice, so you can use normal slice
    // indexing and other methods to access its contents:
    v[0] = v[1] + v[2];
    v.sort();
    v.insert(10, 6);
}

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