Inner union structs not generated

[daschl]

Input C/C++ Header

https://github.com/couchbase/libcouchbase/blob/master/include/libcouchbase/couchbase.h#L275

struct lcb_create_st {
    /** Indicates which field in the @ref lcb_CRST_u union should be used. Set this to `3` */
    int version;

    /**This union contains the set of current and historical options. The
     * The #v3 field should be used. */
    union lcb_CRST_u {
        struct lcb_create_st0 v0;
        struct lcb_create_st1 v1;
        struct lcb_create_st2 v2;
        struct lcb_create_st3 v3; /**< Use this field */
    } v;
    LCB_DEPR_CTORS_CRST
};

Bindgen Invokation

    let _ = bindgen::builder()
        .header("headers.h")
        .clang_arg("-I")
        .clang_arg(bindgen_path)
        .no_unstable_rust()
        .generate_comments(false)
        .generate()
        .unwrap()
        .write_to_file(Path::new(out_dir).join("bindings.rs"));

Actual Results

error[E0412]: cannot find type `lcb_create_st_lcb_CRST_u` in this scope
    --> /Users/daschl/code/rust/couchbase-rs/target/debug/build/couchbase-sys-4dafd1d829eed0ef/out/bindings.rs:3635:12
     |
3635 |     pub v: lcb_create_st_lcb_CRST_u,
     |            ^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope

error[E0204]: the trait `Copy` may not be implemented for this type
    --> /Users/daschl/code/rust/couchbase-rs/target/debug/build/couchbase-sys-4dafd1d829eed0ef/out/bindings.rs:3632:17
     |
3632 | #[derive(Debug, Copy)]
     |                 ^^^^
...
3635 |     pub v: lcb_create_st_lcb_CRST_u,
     |     ------------------------------- this field does not implement `Copy`

error: aborting due to previous error

#[repr(C)]
#[derive(Debug, Copy)]
pub struct lcb_create_st {
    pub version: ::std::os::raw::c_int,
    pub v: lcb_create_st_lcb_CRST_u,
}

Expected Results

I think the problem is that lcb_create_st expects lcb_create_st_lcb_CRST_u but its not created. I've been upgrading from 0.21 which used to work, but its broken since 0.22 I think (and is broken right now I tried 0.23.1).

[emilio]

Can you check on master? It's likely a dupe of #643

[daschl]

yes that indeed seems to fix it - thanks!