Fixed unit tests

Src/AST/Myc.Ast.Scope.pas

@@ -73,14 +73,15 @@ type
                 constructor Create(const AValue: TDataValue);
             end;
 
+            // Corrected TValueRef: Holds a stable reference to the scope and address, not the raw array.
             TValueRef = class(TInterfacedObject, IValueCell)
             private
-                FValues: TArray<TDataValue>;
-                FIdx: Integer;
+                FScope: IExecutionScope;
+                FAddress: TResolvedAddress;
                 function GetValue: TDataValue;
                 procedure SetValue(const AValue: TDataValue);
             public
-                constructor Create(const AValues: TArray<TDataValue>; AIdx: Integer);
+                constructor Create(const AScope: IExecutionScope; const AAddress: TResolvedAddress);
             end;
 
     private
@@ -131,7 +132,7 @@ type
         property Symbols: TDictionary<string, Integer> read FSymbols;
     end;
 
-{ TValueCell }
+{ TExecutionScope.TValueCell }
 
 constructor TExecutionScope.TValueCell.Create(const AValue: TDataValue);
 begin
@@ -149,6 +150,27 @@ begin
     FValue := AValue;
 end;
 
+{ TExecutionScope.TValueRef }
+
+constructor TExecutionScope.TValueRef.Create(const AScope: IExecutionScope; const AAddress: TResolvedAddress);
+begin
+    inherited Create;
+    FScope := AScope;
+    FAddress := AAddress;
+end;
+
+function TExecutionScope.TValueRef.GetValue: TDataValue;
+begin
+    // Delegate the call to the scope, which correctly handles parent traversal.
+    Result := FScope[FAddress];
+end;
+
+procedure TExecutionScope.TValueRef.SetValue(const AValue: TDataValue);
+begin
+    // Delegate the call to the scope.
+    FScope[FAddress] := AValue;
+end;
+
 { TExecutionScope }
 
 constructor TExecutionScope.Create(
@@ -215,17 +237,10 @@ begin
         end;
         akLocalOrParent:
         begin
-            var targetScope := Self;
-            for var i := 1 to Address.ScopeDepth do
-            begin
-                targetScope := targetScope.Parent as TExecutionScope;
-                Assert(Assigned(targetScope), 'Invalid scope depth during value retrieval.');
-            end;
-            Assert(
-                (Address.SlotIndex >= 0) and (Address.SlotIndex < Length(targetScope.FValues)),
-                'Invalid scope index during value retrieval.'
-            );
-            Result := TValueRef.Create(targetScope.FValues, Address.SlotIndex);
+            // Corrected Implementation: Create a TValueRef that holds the current scope
+            // and the full address. The scope's indexer will handle the parent traversal correctly
+            // and is robust against array reallocations.
+            Result := TValueRef.Create(Self, Address);
         end;
     else
         raise EInvalidOpException.Create('Cannot get value for an unresolved address.');
@@ -393,23 +408,6 @@ begin
     end;
 end;
 
-constructor TExecutionScope.TValueRef.Create(const AValues: TArray<TDataValue>; AIdx: Integer);
-begin
-    inherited Create;
-    FValues := AValues;
-    FIdx := AIdx;
-end;
-
-function TExecutionScope.TValueRef.GetValue: TDataValue;
-begin
-    Result := FValues[FIdx];
-end;
-
-procedure TExecutionScope.TValueRef.SetValue(const AValue: TDataValue);
-begin
-    FValues[FIdx] := AValue;
-end;
-
 { TScopeDescriptor }
 
 constructor TScopeDescriptor.Create(const AParent: IScopeDescriptor);

Src/AST/Myc.Ast.pas

@@ -29,7 +29,6 @@ type
 
         // --- Factory functions ---
         class function Constant(const AValue: TDataValue): IConstantNode; overload; static;
-        class function Constant(const AValue: TScalar): IConstantNode; overload; static;
         class function Constant(const AValue: String): IConstantNode; overload; static;
         class function Identifier(AName: string): IIdentifierNode; static;
         class function BinaryExpr(ALeft: IAstNode; AOperator: TScalar.TBinaryOp; ARight: IAstNode): IBinaryExpressionNode; static;
@@ -703,11 +702,6 @@ begin
     Result := TConstantNode.Create(AValue);
 end;
 
-class function TAst.Constant(const AValue: TScalar): IConstantNode;
-begin
-    Result := TConstantNode.Create(TDataValue(AValue));
-end;
-
 class function TAst.Constant(const AValue: String): IConstantNode;
 begin
     Result := TConstantNode.Create(TDataValue(AValue));

Src/Data/Myc.Data.Value.pas

@@ -53,6 +53,8 @@ type
         class operator Initialize(out Dest: TDataValue);
         class function Void: TDataValue; inline; static;
 
+        class operator Implicit(const AValue: Int64): TDataValue; overload; inline;
+        class operator Implicit(const AValue: Double): TDataValue; overload; inline;
         class operator Implicit(const AValue: TScalar): TDataValue; overload; inline;
         class operator Implicit(const AValue: TDataValue): TScalar; overload; inline;
         class operator Implicit(const AValue: String): TDataValue; overload; inline;
@@ -479,6 +481,20 @@ begin
     Result := AValue.AsScalar;
 end;
 
+class operator TDataValue.Implicit(const AValue: Int64): TDataValue;
+begin
+    Result.FKind := Ord(vkScalar);
+    Result.FScalar := TScalar.FromInt64(AValue);
+    Result.FInterface := nil;
+end;
+
+class operator TDataValue.Implicit(const AValue: Double): TDataValue;
+begin
+    Result.FKind := Ord(vkScalar);
+    Result.FScalar := TScalar.FromDouble(AValue);
+    Result.FInterface := nil;
+end;
+
 { TDataValueKindHelper }
 
 function TDataValueKindHelper.ToString: string;

Test/Test.Ast.Interpreter.Scope.pas

@@ -38,6 +38,10 @@ type
 
         [Test]
         procedure Test_CaptureFromGlobalScope;
+
+        [Test]
+        procedure Test_ClosureCaptureWithParentScopeReallocation;
+
     end;
 
 implementation
@@ -236,4 +240,51 @@ begin
     Assert.AreEqual<Int64>(100, resultValue.AsScalar.Value.AsInt64, 'Should be able to access variables from the parent scope.');
 end;
 
+procedure TInterpreterScopeTests.Test_ClosureCaptureWithParentScopeReallocation;
+var
+    rootScope: IExecutionScope;
+    parentScope: IExecutionScope;
+    lambdaScope: IExecutionScope;
+    addressOfX_from_lambda: TResolvedAddress;
+    addressOfX_in_parent: TResolvedAddress;
+    capturedCell: IValueCell;
+    valueFromClosure: TDataValue;
+begin
+    // 1. Setup scopes: root -> parent -> lambda
+    rootScope := TScope.CreateScope(nil, nil, nil);
+    parentScope := TScope.CreateScope(rootScope, nil, nil);
+    lambdaScope := TScope.CreateScope(parentScope, nil, nil);
+
+    // 2. Define a variable 'x' in the parent scope. It will be at slot 0.
+    parentScope.Define('x', 10);
+    addressOfX_in_parent := TResolvedAddress.Create(akLocalOrParent, 0, 0);
+    Assert.AreEqual(Int64(10), parentScope[addressOfX_in_parent].AsScalar.Value.AsInt64);
+
+    // 3. From the lambda's perspective, 'x' is one level up (ScopeDepth=1) at slot 0.
+    addressOfX_from_lambda := TResolvedAddress.Create(akLocalOrParent, 1, 0);
+
+    // 4. Capture 'x' into a value cell, simulating a closure.
+    // This creates the buggy TValueRef that holds a direct reference to the parent's internal array.
+    capturedCell := lambdaScope.Capture(addressOfX_from_lambda);
+    Assert.AreEqual(Int64(10), capturedCell.Value.AsScalar.Value.AsInt64, 'Initial captured value should be correct');
+
+    // 5. Trigger the bug: Define another variable in the parent scope.
+    // This forces a SetLength on the internal FValues array, which may cause a reallocation.
+    parentScope.Define('y', 20);
+
+    // 6. Update the original variable 'x' in the parent scope to a new value.
+    parentScope[addressOfX_in_parent] := 99;
+    Assert.AreEqual(Int64(99), parentScope[addressOfX_in_parent].AsScalar.Value.AsInt64, 'Value in parent scope should be updated');
+
+    // 7. Read the value from the captured cell again.
+    // The test will fail here. The captured cell still points to the old, orphaned memory block
+    // where the value of x is still 10, not the new value 99.
+    valueFromClosure := capturedCell.Value;
+    Assert.AreEqual(
+        Int64(99),
+        valueFromClosure.AsScalar.Value.AsInt64,
+        'The captured cell must reflect changes in the parent scope after reallocation'
+    );
+end;
+
 end.