testing: include cover mode in cover profile

R=adg, rsc
CC=golang-dev
https://golang.org/cl/10392049

diff --git a/src/pkg/testing/cover.go b/src/pkg/testing/cover.go
index 24198706acda8137f014b3d355e520408d1f7189..4136becbfc490a7ea43cad4d7264630668cc4f59 100644 (file)
--- a/src/pkg/testing/cover.go
+++ b/src/pkg/testing/cover.go
@@ -50,6 +50,7 @@ func coverReport() {
        if *coverProfile != "" {
                f, err = os.Create(toOutputDir(*coverProfile))
                mustBeNil(err)
+               fmt.Fprintf(f, "mode: %s\n", *coverMode)
                defer func() { mustBeNil(f.Close()) }()
        }