unused demangling?

[JyJyJcr]

https://github.com/nginxinc/ngx-rust/blob/85570e2e57eb6f3f171469eda1d3d94716d20ab2/src/http/request.rs#L11-L89

These macros define demangled functions, but the demangled symbols seem never used in dynamic loading.
Does the unused symbols have any advantage of compatibility or extendability?

[bavshin-f5]

No, there's no real purpose in #[no_mangle] there. extern "C" ABI qualifier is sufficient to declare a function callable from the nginx C code by address. The only declarations that require no_mangle are module exports, e.g. ngx_modules! macro internals and static ngx_module_t globals in the example modules.
I've planned to clean up the rest, but with everything else we need to do for this project it's a low priority.

[JyJyJcr]

The reason I asked this question: I tried to minimize revealed symbols of the module, but I didn't know which one is safe to remove, and which is not.
Now I got the proper criteria. Thank you for answering!