================
@@ -16,6 +16,8 @@ void test1(struct fam_struct *ptr, int size, int idx) {
 
   *__builtin_counted_by_ref(ptr->array) = size;             // ok
   *__builtin_counted_by_ref(&ptr->array[idx]) = size;       // ok
+  *__builtin_counted_by_ref(&ptr->array) = size;            // ok
----------------
bwendling wrote:

`*__builtin_counted_by_ref(ptr->array[idx]) = size;` doesn't work because the 
builtin requires a pointer to the FAM. (If you meant `&ptr->array[idx]`, that 
does work.)

I don't have any use case for `&ptr->array` or the like. I just don't want to 
be overly restrictive on what's considered a valid argument to the builtin. I 
think I'll do a comparison with gcc's version and see what they accept. We can 
match them.

https://github.com/llvm/llvm-project/pull/114495
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