io: fixes for Read with n > 0, os.EOF
R=rsc
CC=golang-dev
https://golang.org/cl/4271080
diff --git a/src/pkg/io/multi.go b/src/pkg/io/multi.go
index 88e4f1b..d702d46 100644
--- a/src/pkg/io/multi.go
+++ b/src/pkg/io/multi.go
@@ -15,10 +15,8 @@
n, err = mr.readers[0].Read(p)
if n > 0 || err != os.EOF {
if err == os.EOF {
- // This shouldn't happen.
- // Well-behaved Readers should never
- // return non-zero bytes read with an
- // EOF. But if so, we clean it.
+ // Don't return EOF yet. There may be more bytes
+ // in the remaining readers.
err = nil
}
return
