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: build.rs
    path of file: ./repos/difftastic/vendored_parsers/tree-sitter-scheme/bindings/rust
    
    the code of the file until where you have to start completion: fn main() {
    let src_dir = std::path::Path::new("src");

    let mut c_config = cc::Build::new();
    c_config.include(src_dir);
    c_config
        .flag_if_supported("-Wno-unused-parameter")
        .flag_if_supported("-Wno-unused-but-set-variable")
        .flag_if_supported("-Wno-trigraphs");
    let parser_path = src_dir.join("parser.c");
    c_config.file(&parser_path);

    // If your language uses an external scanner written in C,
    // then include this block of code:

    /*
    let scanner_path = src_dir.join("scanner.c");
    c_config.file(&scanner_path);
    println!("cargo:rerun-if-changed={}", scanner_path.to_str().unwrap());
    */

    c_config.compile("parser");
    println!("cargo:rerun-if-changed={}", parser_path.to_str().unwrap());

    // If your language uses an external scanner written in C++,
    // then include this block of code:

    /*

    
fn main() {
    let src_dir = std::path::Path::new("src");

    let mut c_config = cc::Build::new();
    c_config.include(src_dir);
    c_config
        .flag_if_supported("-Wno-unused-parameter")
        .flag_if_supported("-Wno-unused-but-set-variable")
        .flag_if_supported("-Wno-trigraphs");
    let parser_path = src_dir.join("parser.c");
    c_config.file(&parser_path);

    // If your language uses an external scanner written in C,
    // then include this block of code:

    /*
    let scanner_path = src_dir.join("scanner.c");
    c_config.file(&scanner_path);
    println!("cargo:rerun-if-changed={}", scanner_path.to_str().unwrap());
    */

    c_config.compile("parser");
    println!("cargo:rerun-if-changed={}", parser_path.to_str().unwrap());

    // If your language uses an external scanner written in C++,
    // then include this block of code:

    /*
    let mut cpp_config = cc::Build::new();
    cpp_config.cpp(true);
    cpp_config.include(&src_dir);
    cpp_config
        .flag_if_supported("-Wno-unused-parameter")
        .flag_if_supported("-Wno-unused-but-set-variable");
    let scanner_path = src_dir.join("scanner.cc");
    cpp_config.file(&scanner_path);
    cpp_config.compile("scanner");
    println!("cargo:rerun-if-changed={}", scanner_path.to_str().unwrap());
    */
}