github.com/ccccaoqing/test@v0.0.0-20220510085219-3985d23445c0/doc/progs/eff_unused2.go (about)

     1  // compile
     2  
     3  package main
     4  
     5  import (
     6  	"fmt"
     7  	"io"
     8  	"log"
     9  	"os"
    10  )
    11  
    12  var _ = fmt.Printf // For debugging; delete when done.
    13  var _ io.Reader    // For debugging; delete when done.
    14  
    15  func main() {
    16  	fd, err := os.Open("test.go")
    17  	if err != nil {
    18  		log.Fatal(err)
    19  	}
    20  	// TODO: use fd.
    21  	_ = fd
    22  }