String + struct = segfault

[skyfloogle]

The pattern language (both ImHex and the browser playground) will segfault upon running the following code:

struct A {};
A a;
str b = "" + a;

I debugged this a little bit, and it looks like the issue is in Pattern::getValue(). The clone() call creates a unique_ptr, which is freed when the function is done, but its pointer is left in the returned value, which is no longer valid.