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9de41eef6e
Typedef/using declarations in structs and classes were not created with
the native PDB plugin. The following would only create `Foo` and
`Foo::Bar`:
```cpp
struct Foo {
struct Bar {};
using Baz = Bar;
using Int = int;
};
```
With this PR, they're created. One complication is that typedefs and
nested types show up identical. The example from above gives:
```
0x1006 | LF_FIELDLIST [size = 40, hash = 0x2E844]
- LF_NESTTYPE [name = `Bar`, parent = 0x1002]
- LF_NESTTYPE [name = `Baz`, parent = 0x1002]
- LF_NESTTYPE [name = `Int`, parent = 0x0074 (int)]
```
To distinguish nested types and typedefs, we check if the parent of a
type is equal to the current one (`parent(0x1002) == 0x1006`) and if the
basename matches the nested type name.