rust/tests/ui/needless_update.rs

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#![warn(needless_update)]
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#![allow(no_effect)]
struct S {
pub a: i32,
pub b: i32,
}
fn main() {
let base = S { a: 0, b: 0 };
S { ..base }; // no error
S { a: 1, ..base }; // no error
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S { a: 1, b: 1, ..base };
}