diff --git a/compiler/__main__.py b/compiler/__main__.py
index 2c8739b..3cae61c 100644
--- a/compiler/__main__.py
+++ b/compiler/__main__.py
@@ -50,6 +50,8 @@ def main():
         context = semantic.BuiltinContext()
         ast.semantic_analysis(context)
 
+        context.check()
+
         intermediate_representation = ast.intermediate_representation()
 
         messages = []