prettyplease 0.2.25

A minimal `syn` syntax tree pretty-printer
Documentation 
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use std::env;
use std::ffi::OsString;
use std::process;

fn main() {
    println!("cargo:rerun-if-changed=build.rs");

    println!("cargo:rustc-check-cfg=cfg(exhaustive)");
    println!("cargo:rustc-check-cfg=cfg(prettyplease_debug)");
    println!("cargo:rustc-check-cfg=cfg(prettyplease_debug_indent)");

    let pkg_version = cargo_env_var("CARGO_PKG_VERSION");
    println!("cargo:VERSION={}", pkg_version.to_str().unwrap());
}

fn cargo_env_var(key: &str) -> OsString {
    env::var_os(key).unwrap_or_else(|| {
        eprintln!("Environment variable ${key} is not set during execution of build script");
        process::exit(1);
    })
}