rust/tests/mir-opt/array_index_is_temporary.rs
Nicholas Nethercote c9c80d2c5f rustfmt tests/mir-opt.
The only non-obvious changes:
- `building/storage_live_dead_in_statics.rs` has a `#[rustfmt::skip]`
  attribute to avoid reformating a table of data.
- Two `.mir` files have slight changes involving line numbers.
- In `unusual_item_types.rs` an `EMIT_MIR` annotation is moved to
  outside a function, which is the usual spot, because `tidy` complains
  if such a comment is indented.

The commit also tweaks the comments in `rustfmt.toml`.
2024-06-03 14:17:16 +10:00

25 lines
724 B
Rust

//@ test-mir-pass: SimplifyCfg-pre-optimizations
// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
// 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-pre-optimizations.after.mir
fn main() {
// CHECK-LABEL: fn main(
// CHECK: debug x => [[x:_.*]];
// CHECK: debug y => [[y:_.*]];
// CHECK: [[y]] = const 1_usize;
// CHECK: [[tmp:_.*]] = [[y]];
// CHECK: [[x]][[[tmp]]] =
let mut x = [42, 43, 44];
let mut y = 1;
let z: *mut usize = &mut y;
x[y] = unsafe { foo(z) };
}