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: util.rs
    path of file: ./repos/trustfall/trustfall_stubgen/src
    
    the code of the file until where you have to start completion: use quote::quote;

pub(crate) fn to_lower_snake_c
    
        let mut conv_fn = match processed_type {
            "Int" => quote! { as_i64() }, // TODO: this is technically incorrect, it might be u64 too
            "String" => quote! { as_str() },
            "Float" => quote! { as_f64() },
            "Boolean" => quote! { as_bool() },
            _ => unimplemented!(
                "type {processed_type} is not yet supported when autogenerating stubs"
            ),
        };