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go/doc/progs/eff_unused2.go

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package main
import (
"fmt"
"io"
"log"
"os"
)
var _ = fmt.Printf // For debugging; delete when done.
var _ io.Reader // For debugging; delete when done.
func main() {
fd, err := os.Open("test.go")
if err != nil {
log.Fatal(err)
}
// TODO: use fd.
_ = fd
}