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: call_builder.rs
    path of file: ./repos/ink/crates/ink/codegen/src/generator/trait_def
    
    the code of the file until where you have to start completion: // Copyright (C) Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed un
    
    fn generate_ink_trait_impl(&self) -> TokenStream2 {
        let span = self.trait_def.span();
        let trait_ident = self.trait_def.trait_def.item().ident();
        let trait_info_ident = self.trait_def.trait_info_ident();
        let builder_ident = self.ident();
        let message_impls = self.generate_ink_trait_impl_messages();
        quote_spanned!(span=>
            impl<E> ::ink::env::ContractEnv for #builder_ident<E>
            where
                E: ::ink::env::Environment,
            {
                type Env = E;
            }

            impl<E> #trait_ident for #builder_ident<E>
            where
                E: ::ink::env::Environment,
            {
                #[allow(non_camel_case_types)]
                type __ink_TraitInfo = #trait_info_ident<E>;

                #message_impls
            }
        )
    }