When I compile this program:

```
#include <variant>
#include <vector>

struct G {
    int x;
};

int main() {
    struct A {
        int x;
    };
    A a;
    std::variant<A> b {a};
    std::vector<A> c {a};
    std::variant<G> d {G {}};

    __builtin_trap();
}
```

Then run it in gdb, note that `print b` prints

```
std::variant<> [no contained value]
```

but `print d` prints

```
std::variant<G> [index 0] = {{x = 0}}
```

In the first case the print is wrong.

It's caused by `Type.template_argument` function: If this is called in the Python shell

```
>>> gdb.lookup_symbol("b")[0].type.template_argument(0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: syntax error
```