diff options
Diffstat (limited to 'src/test/mir-opt/array-index-is-temporary.rs')
-rw-r--r-- | src/test/mir-opt/array-index-is-temporary.rs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/mir-opt/array-index-is-temporary.rs b/src/test/mir-opt/array-index-is-temporary.rs new file mode 100644 index 000000000..0e4c486e4 --- /dev/null +++ b/src/test/mir-opt/array-index-is-temporary.rs @@ -0,0 +1,17 @@ +// 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_FOR_EACH_BIT_WIDTH +// 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) }; +} |