rust/tests/mir-opt/array_index_is_temporary.rs
2023-01-11 09:32:08 +00:00

18 lines
434 B
Rust

// Retagging (from Stacked Borrows) relies on the array index being a fresh
// temporary, so that side-effects cannot change it.
// Test that this is indeed the case.
unsafe fn foo(z: *mut usize) -> u32 {
*z = 2;
99
}
// EMIT_MIR array_index_is_temporary.main.SimplifyCfg-elaborate-drops.after.mir
fn main() {
let mut x = [42, 43, 44];
let mut y = 1;
let z: *mut usize = &mut y;
x[y] = unsafe { foo(z) };
}