Consider this header:

```
struct Foo {
    struct {
        int x;
        union {
            int y;
            int z;
        };
    };
};
```

Jextract generates this:

```
private static final GroupLayout $LAYOUT = MemoryLayout.structLayout(
        MemoryLayout.structLayout(
        foo_h.C_INT.withName("x"),
        MemoryLayout.unionLayout(
        foo_h.C_INT.withName("y"),
        foo_h.C_INT.withName("z")
    ).withName("$anon$7:9")
    ).withName("$anon$5:5")
    ).withName("Foo");
```

As it can be seen, the nested anon layouts are not indented as they should and this causes the layout declaration to be not very readable.