Imutability for macro nodes

Src/AST/Myc.Ast.Script.pas

@@ -970,7 +970,7 @@ procedure TPrettyPrintVisitor.VisitMacroExpansionNode(const Node: IMacroExpansio
 begin
     // For pretty-printing, show the original macro call, not the expanded body.
     // Delegate to the regular VisitFunctionCall to print it as such.
-    VisitFunctionCall(Node);
+    VisitFunctionCall(Node.CallNode);
 end;
 
 procedure TPrettyPrintVisitor.VisitRecurNode(const Node: IRecurNode);