Fixed macro expansion

Src/AST/Myc.Ast.Compiler.TCO.pas

@@ -212,11 +212,6 @@ begin
     FNextIsTail := FIsTailStack.Peek;
     N.ExpandedBody := Accept(N.ExpandedBody);
 
-    // Also visit the original call nodes, though they are not in tail pos
-    FNextIsTail := False;
-    N.Callee := Accept(N.Callee);
-    N.Arguments := AcceptNodes(N.Arguments);
-
     Result := N;
 end;
 

Src/AST/Myc.Ast.TypeChecker.pas

@@ -51,7 +51,6 @@ type
         function VisitKeyword(const Node: IKeywordNode): IAstNode; override;
 
         // Compile-time nodes (should not be present)
-        function VisitMacroExpansionNode(const Node: IMacroExpansionNode): IAstNode; override;
         function VisitMacroDefinition(const Node: IMacroDefinitionNode): IAstNode; override;
     public
         constructor Create(const ADescriptor: IScopeDescriptor);
@@ -148,12 +147,6 @@ begin
     raise Exception.Create('TTypeChecker: MacroDefinition node encountered.');
 end;
 
-function TTypeChecker.VisitMacroExpansionNode(const Node: IMacroExpansionNode): IAstNode;
-begin
-    // TypeChecker runs *after* expansion, so we just visit the body.
-    Result := Accept(Node.ExpandedBody);
-end;
-
 function TTypeChecker.VisitVariableDeclaration(const Node: IVariableDeclarationNode): IAstNode;
 var
     initType: IStaticType;

Src/AST/Myc.Ast.Visitor.pas

@@ -503,12 +503,14 @@ var
     N: TMacroExpansionNode;
 begin
     N := (Node as TMacroExpansionNode);
-    // Visit original call parts
-    N.Callee := Accept(N.Callee);
-    N.Arguments := AcceptNodes(N.Arguments);
-    // Visit expanded body
+
+    // ONLY visit the expanded body, as this is the "real" AST node.
     N.ExpandedBody := Accept(N.ExpandedBody);
-    Result := Node;
+
+    // Callee and Arguments are metadata for the visualizer and must NOT be visited
+    // by subsequent phases (Binder, TypeChecker, etc.).
+
+    Result := Node; // Return the (mutated) wrapper
 end;
 
 function TAstTransformer.VisitBlockExpression(const Node: IBlockExpressionNode): IAstNode;