cxx 1.0.194

Safe interop between Rust and C++
Documentation 
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error: use of deprecated struct `ffi::_::StructX`:
       Shared struct redeclared as an unsafe extern C++ type is deprecated.
       If this is intended to be a shared struct, remove this `type StructX`.
       If this is intended to be an extern type, change it to:

           use cxx::ExternType;

           #[repr(C)]
           pub struct StructX {
               ...
           }

           unsafe impl ExternType for StructX {
               type Id = cxx::type_id!("mine::StructX");
               type Kind = cxx::kind::Trivial;
           }

           pub mod ffi {
               #[namespace = "mine"]
               extern "C++" {
                   type StructX = crate::StructX;
               }
               ...
           }
  --> tests/ui/extern_shared_struct.rs:11:14
   |
11 |         type StructX;
   |              ^^^^^^^
   |
note: the lint level is defined here
  --> tests/ui/extern_shared_struct.rs:1:9
   |
 1 | #![deny(deprecated)]
   |         ^^^^^^^^^^