Typedef in .h shadows class in .hpp

[robertbastian]

In Google C++, each type's header needs to be explicitly included. This leads to an issue with Diplomat's current output. For example:

#ifndef diplomat_result_box_ICU4XBidi_ICU4XError_H
#define diplomat_result_box_ICU4XBidi_ICU4XError_H
#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include "diplomat_runtime.h"

typedef struct ICU4XBidi ICU4XBidi;
#include "ICU4XError.h"
#ifdef __cplusplus
namespace capi {
extern "C" {
#endif
typedef struct diplomat_result_box_ICU4XBidi_ICU4XError {
    union {
        ICU4XBidi* ok;
        ICU4XError err;
    };
    bool is_ok;
} diplomat_result_box_ICU4XBidi_ICU4XError;
#ifdef __cplusplus
} // extern "C"
} // namespace capi
#endif
#endif

Note that the typedef struct ICU4XBidi ICU4XBidi; is defined outside the namespace capi. Wherever this file is included, there is some weird shadowing going on, and our linter insists on importing this file, which then breaks everything as the struct is not a class.