https://github.com/embassy-rs/trouble/pull/190 this is the pr I'm working on.
```rust
            let docs: TokenStream2 = doc_string 
                 .lines() 
                 .map(|line| { 
                     let span = field.span(); 
                     quote_spanned!(span=> 
                         #[doc = #line] 
                     ) 
                 }) 
                 .collect(); 
              let ident = field.ident.clone(); 
              let ty = field.ty.clone(); 
              let vis = &field.vis; 
              self.code_fields.extend(quote_spanned! {field.span()=> 
                 #docs 
                  #vis #ident: #ty, 
              }) 
          } 
          self
```