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// skip
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"time"
)
func main() {
// Make a big map.
m := map[int]int{}
for i := 0; i < 100000; i++ {
m[i] = i
}
c := make(chan string)
go func() {
// Print the map.
s := fmt.Sprintln(m)
c <- s
}()
go func() {
time.Sleep(1 * time.Millisecond)
// Add an extra item to the map while iterating.
m[-1] = -1
c <- ""
}()
<-c
<-c
}