...

compiler/NubLang/Generation/QBE/QBEGenerator.cs

@@ -693,6 +693,7 @@ public class QBEGenerator
             StructFuncCallNode expr => EmitStructFuncCall(expr),
             StructInitializerNode expr => EmitStructInitializer(expr),
             UnaryExpressionNode expr => EmitUnaryExpression(expr),
+            SizeCompilerMacroNode expr => $"{SizeOf(expr.TargetType)}",
             _ => throw new ArgumentOutOfRangeException(nameof(rValue))
         };
     }