You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/wasm-bindgen/crates/externref-xform/src
    
    the code of the file until where you have to start completion: //! Transformation for wasm-bindgen to enable usage of `externref` in a wasm
//! module.
//!
//! This crate is in charge of enabling code using `wasm-bindgen` to use the
//! `externref` type inside of the wasm module. This transformation pass primarily
//! wraps exports and imports in shims which 
    
    fn process_exports(&mut self, module: &mut Module) -> Result<(), Error> {
        // let mut new_exports = Vec::new();
        for export in module.exports.iter_mut() {
            let f = match export.item {
                walrus::ExportItem::Function(f) => f,
                _ => continue,
            };
            let function = match self.cx.exports.remove(&export.id()) {
                Some(s) => s,
                None => continue,
            };
            let (shim, _externref_ty) = self.append_shim(
                f,
                &export.name,
                function,
                &mut module.types,
                &mut module.funcs,
                &mut module.locals,
            )?;
            export.item = shim.into();
        }
        Ok(())
    }