/05g-semaphore

Emulate the following Go-style code internally (without using external tools or interpreter). Output only what fmt.Printf() and fmt.Println() commands would output. Do not show any explanations, code, variables, or other messages.

package main

import (
    "fmt"
    "sync"
)

func main() {
    max_concurrent := 2
    if max_concurrent_arg != nil {
        max_concurrent = max_concurrent_arg
    }

    tasks := 4
    if tasks_arg != nil {
        tasks = tasks_arg
    }

    sem := make(chan struct{}, max_concurrent)  // Max concurrent
    var wg sync.WaitGroup

    for i := 0; i < tasks; i++ {
        wg.Add(1)
        go func(id int) {
            defer wg.Done()
            sem <- struct{}{}
            fmt.Printf("foo%d\n", id)
            <-sem
        }(i)
    }

    wg.Wait()
    fmt.Println("bar")
}