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&mut T during the evaluation of a const/static initializer #16

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@oli-obk

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@oli-obk

While is very important to not have static or const items of such types, during the evaluation of a static or const item we might want to work with intermediate values of this type.

E.g.

const FOO: usize = {
    let mut x = [5, 6, 7];
    x.swap(0, 1);
    x[0] // should be `6`
};

seems totally reasonable.

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