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: mod.rs
    path of file: ./repos/phaser/phaser/vendor/syn/tests/common
    
    the code of the file until where you have to start completion: #![allow(dead_code)]

use rayon::ThreadPoolBuilder;
use std::env;

pub mod eq;
pub mod parse;

/// Read the `ABORT_AFTER_FAILURE` environment variable, and parse it.
pub fn abort_after() -> 
    
pub fn rayon_init() {
    let stack_size = match env::var("RUST_MIN_STACK") {
        Ok(s) => s.parse().expect("failed to parse RUST_MIN_STACK"),
        Err(_) => 20 * 1024 * 1024,
    };
    ThreadPoolBuilder::new()
        .stack_size(stack_size)
        .build_global()
        .unwrap();
}