Fix "dereferencing a null pointer" in C layout tests

Instead of dereferencing a null pointer, create a MaybeUninit from which
we can extract well-defined addresses.

1 files changed, 5 insertions, 1 deletions

diff --git a/tests/expectations/tests/libclang-9/incomplete-array-padding.rs b/tests/expectations/tests/libclang-9/incomplete-array-padding.rs
index 382195db..ba1f9ce0 100644
--- a/tests/expectations/tests/libclang-9/incomplete-array-padding.rs
+++ b/tests/expectations/tests/libclang-9/incomplete-array-padding.rs
@@ -141,7 +141,11 @@ fn bindgen_test_layout_foo() {
         concat!("Alignment of ", stringify!(foo))
     );
     assert_eq!(
-        unsafe { &(*(::std::ptr::null::<foo>())).b as *const _ as usize },
+        unsafe {
+            let uninit = ::std::mem::MaybeUninit::<foo>::uninit();
+            let ptr = uninit.as_ptr();
+            ::std::ptr::addr_of!((*ptr).b) as usize - ptr as usize
+        },
         8usize,
         concat!("Offset of field: ", stringify!(foo), "::", stringify!(b))
     );