Address-of compound literal expression fails

[john-h-kastner]

struct a {  int a; };
_Ptr<struct a> a0 =  &(struct a){0};

Compiling with clang -c gives

struct.c:5:22: error: expression has unknown bounds, cast to ptr<T> expects source to have bounds
_Ptr<struct a> a0 =  &(struct a){0};
                     ^~~~~~~~~~~~~~
1 error generated.

The same result is seen for array compound literals

_Ptr<int[1]> a1 = &(int[1]){0};

arr.c:1:19: error: expression has unknown bounds, cast to ptr<T> expects source to have bounds
_Ptr<int[1]> a1 = &(int[1]){0};
                  ^~~~~~~~~~~~
1 error generated.