diff --git a/examples/test.rs b/examples/test.rs
index c717331..15bf789 100644
--- a/examples/test.rs
+++ b/examples/test.rs
@@ -39,8 +39,8 @@ fn main() {
 
     let mut vm = VirtualMachine::default();
 
-    vm.set_global("max".into(), Max.into());
-    vm.set_global("print".into(), Print.into());
+    vm.set_global("max".into(), Max.into()).unwrap();
+    vm.set_global("print".into(), Print.into()).unwrap();
 
     dbg!(&compilation_unit);
 
diff --git a/src/lib.rs b/src/lib.rs
index bb547de..e90b83a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -18,7 +18,7 @@
 //! let compilation_unit = compile("print(\"hello\")", None).unwrap();
 //!
 //! let mut vm = vm::VirtualMachine::default();
-//! vm.set_global("print".into(), Print.into());
+//! vm.set_global("print".into(), Print.into()).unwrap();
 //!
 //! let mut runner = compilation_unit.with_virtual_machine(&mut vm).execute();
 //!