1const A = struct {};
 2const B = struct {};
 3comptime {
 4    const val: [1]A = .{.{}};
 5    const ptr: *const [1]B = @ptrCast(&val);
 6    _ = ptr ** 2;
 7}
 8
 9// error
10//
11// :6:9: error: comptime dereference requires '[1]tmp.B' to have a well-defined layout