examples: add "ExampleLabelsGoFunc"

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

examples/cmd/cmd.go

@@ -21,9 +21,23 @@ import (
 	"github.com/coreos/gofail/examples"
 )
 
+/*
+GOFAIL_HTTP=:22381 go run cmd.go
+
+curl -L http://localhost:22381
+
+curl \
+  -L http://localhost:22381/github.com/coreos/gofail/examples/ExampleLabelsGo \
+  -X PUT -d'return'
+
+curl \
+  -L http://localhost:22381/github.com/coreos/gofail/examples/ExampleLabelsGo \
+  -X DELETE
+*/
+
 func main() {
 	for {
-		log.Println(examples.ExampleFunc())
+		log.Println(examples.ExampleLabelsGoFunc())
 		time.Sleep(time.Second)
 	}
 }

examples/examples.go

@@ -39,3 +39,18 @@ func ExampleLabelsFunc() (s string) {
 	}
 	return s
 }
+
+func ExampleLabelsGoFunc() (s string) {
+	i := 0
+	// gofail: myLabel:
+	for i < 5 {
+		s = s + "i"
+		i++
+		for j := 0; j < 5; j++ {
+			s = s + "j"
+			// gofail-go: var ExampleLabelsGo struct{}
+			// continue myLabel
+		}
+	}
+	return s
+}