diff --git a/src/02-code-project-organization/1-variable-shadowing/main.go b/src/02-code-project-organization/1-variable-shadowing/main.go
index 16187a2..50df791 100644
--- a/src/02-code-project-organization/1-variable-shadowing/main.go
+++ b/src/02-code-project-organization/1-variable-shadowing/main.go
@@ -5,6 +5,13 @@ import (
 	"net/http"
 )
 
+func main() {
+	_ = listing1()
+	_ = listing2()
+	_ = listing3()
+	_ = listing4()
+}
+
 func listing1() error {
 	var client *http.Client
 	if tracing {