testing: fixed bug introduced by CL 21504

This broke T.Run

Change-Id: I12c8fe3612f3fa2caa83049c1c7003056daf2b0c
Reviewed-on: https://go-review.googlesource.com/21600
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/testing/sub_test.go

@@ -178,6 +178,22 @@ func TestTRun(t *T) {
 === RUN   skipping without message, chatty
 --- SKIP: skipping without message, chatty (0.00s)`,
 		f: func(t *T) { t.SkipNow() },
+	}, {
+		desc:   "chatty with recursion",
+		ok:     true,
+		chatty: true,
+		output: `
+=== RUN   chatty with recursion
+=== RUN   chatty with recursion/#00
+=== RUN   chatty with recursion/#00/#00
+--- PASS: chatty with recursion (0.00s)
+    --- PASS: chatty with recursion/#00 (0.00s)
+        --- PASS: chatty with recursion/#00/#00 (0.00s)`,
+		f: func(t *T) {
+			t.Run("", func(t *T) {
+				t.Run("", func(t *T) {})
+			})
+		},
 	}, {
 		desc: "skipping without message, not chatty",
 		ok:   true,
@@ -435,6 +451,14 @@ func TestBRun(t *T) {
 --- SKIP: root
 	sub_test.go:: skipping`,
 		f: func(b *B) { b.Skip("skipping") },
+	}, {
+		desc:   "chatty with recursion",
+		chatty: true,
+		f: func(b *B) {
+			b.Run("", func(b *B) {
+				b.Run("", func(b *B) {})
+			})
+		},
 	}, {
 		desc: "skipping without message, not chatty",
 		f:    func(b *B) { b.SkipNow() },

src/testing/testing.go

@@ -571,7 +571,7 @@ func (t *T) Run(name string, f func(t *T)) bool {
 	if t.chatty {
 		// Print directly to root's io.Writer so there is no delay.
 		root := t.parent
-		for ; root.parent != nil; root = t.parent {
+		for ; root.parent != nil; root = root.parent {
 		}
 		fmt.Fprintf(root.w, "=== RUN   %s\n", t.name)
 	}