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: utils.rs
    path of file: ./repos/rustc_codegen_cranelift/build_system
    
    the code of the file until where you have to start completion: use std::env;
use std::fs;
use std::io;
use std::path
    
pub(crate) fn maybe_incremental(cmd: &mut Command) {
    if is_ci() || std::env::var("CARGO_BUILD_INCREMENTAL").map_or(false, |val| val == "false") {
        // Disabling incr comp reduces cache size and incr comp doesn't save as much on CI anyway
        cmd.env("CARGO_BUILD_INCREMENTAL", "false");
    } else {
        // Force incr comp even in release mode unless in CI or incremental builds are explicitly disabled
        cmd.env("CARGO_BUILD_INCREMENTAL", "true");
    }
}