bytes: Reader.WriteTo returns EOF incorrectly #4421
Description
// WriteTo implements the io.WriterTo interface.
func (r *Reader) WriteTo(w io.Writer) (n int64, err error) {
r.prevRune = -1
if r.i >= len(r.s) {
return 0, io.EOF
}
The io.EOF should be nil. This breaks:
package main
import (
"bytes"
"log"
"os/exec"
)
func main() {
cmd := exec.Command("cat")
cmd.Stdin = bytes.NewReader(nil)
err := cmd.Run()
if err != nil {
log.Fatal(err)
}
}
Obviously there are simpler tests.