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io: make CopyBuffer docs state when buf is not used

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Document that if either src implements the WriteTo interface
or if dst implements the ReaderFrom interface, then
buf will not be used.

Fixes #32276
This commit is contained in:
sandyskies 2019-10-22 01:24:06 +08:00
parent 1b541b4bf2
commit 750e7e86d5
1 changed files with 1 additions and 1 deletions
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2
src/io/io.go
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@ -369,7 +369,7 @@ func Copy(dst Writer, src Reader) (written int64, err error) {
// temporary one. If buf is nil, one is allocated; otherwise if it has
// zero length, CopyBuffer panics.
//
// If either src implements WriterTo or if dst implements ReaderFrom,
// If either src implements WriterTo or dst implements ReaderFrom,
// buf will not be used to perform the copy.
func CopyBuffer(dst Writer, src Reader, buf []byte) (written int64, err error) {
if buf != nil && len(buf) == 0 {