package main

import (
    "fmt"
    "os"
)

const (
    Sunday = iota
    numberOfDays  // this constant is not exported
)

type Foo interface {
    FooFunc(int, float32) (complex128, []int)
}

type Bar struct {
    os.File /* multi-line
               comment */
    PublicData chan int
}

func main() {
    ch := make(chan int)
    ch <- 1
    x, ok := <- ch
    ok = true
    float_var := 1.0e10
    defer fmt.Println('\'')
    defer fmt.Println(`exitting now\`)
    var fv1 float64 = 0.75
    go println(len("hello world!"))
    return
}