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: builder.rs
    path of file: ./repos/wasmtime/crates/cranelift/src
    
    the code of the file until where you have to start completion: //! Implementation of a "compiler builder" for cranelift
//!
//! This module contains the implementation of how Cranelift is configured, as
//! well as providing a function to return the default configuration to build.

use anyhow::Result;
use cranelift_codegen::{
    isa::{self, OwnedTar
    
    fn build(&self) -> Result<Box<dyn wasmtime_environ::Compiler>> {
        let isa = self.inner.build()?;
        Ok(Box::new(crate::compiler::Compiler::new(
            self.tunables
                .as_ref()
                .expect("set_tunables not called")
                .clone(),
            isa,
            self.cache_store.clone(),
            self.linkopts.clone(),
            self.clif_dir.clone(),
            self.wmemcheck,
        )))
    }