Printing temporary value struct

### Zig Version

0.10.0-dev.63+6b8e33d14 

### Steps to Reproduce

```zig
const T = struct {
    v: u32,
};

const std = @import("std");

pub fn main() void {
    var t = T{ .v = 222 };
    std.debug.print("{} {}\n", .{ T{ .v = 111 }, t });
}
```

### Expected Behavior

```
T{ .v = 111 } T{ .v = 222 }  
```

### Actual Behavior

```
T{ .v = 1 } T{ .v = 222 }  
```