bytes, strings: add Reader.ReadAt race tests
Tests for the race detector to catch anybody
trying to mutate Reader in ReadAt.
LGTM=gri
R=gri
CC=golang-codereviews
https://golang.org/cl/86700043
diff --git a/src/pkg/strings/reader.go b/src/pkg/strings/reader.go
index 93ff804..c02d33b 100644
--- a/src/pkg/strings/reader.go
+++ b/src/pkg/strings/reader.go
@@ -42,6 +42,7 @@
}
func (r *Reader) ReadAt(b []byte, off int64) (n int, err error) {
+ // cannot modify state - see io.ReaderAt
if off < 0 {
return 0, errors.New("strings: invalid offset")
}
