rust/tests/compile-fail/copy_overflow.rs

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// error-pattern: overflow computing total size of `copy`
use std::mem;
fn main() {
let x = 0;
let mut y = 0;
unsafe {
(&mut y as *mut i32).copy_from(&x, 1usize << (mem::size_of::<usize>() * 8 - 1));
}
}