A MIR transform that checks pointers are aligned

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/ui/mir/mir_alignment_check.rs b/tests/ui/mir/mir_alignment_check.rs
new file mode 100644
index 00000000000..6c964c78bd1
--- /dev/null
+++ b/tests/ui/mir/mir_alignment_check.rs
@@ -0,0 +1,11 @@
+// run-fail
+// compile-flags: -C debug-assertions
+// error-pattern: misaligned pointer dereference: address must be a multiple of 0x4 but is
+
+fn main() {
+    let mut x = [0u32; 2];
+    let ptr: *mut u8 = x.as_mut_ptr().cast::<u8>();
+    unsafe {
+        *(ptr.add(1).cast::<u32>()) = 42;
+    }
+}