diff --git a/IDEHelper/Compiler/BfAst.cpp b/IDEHelper/Compiler/BfAst.cpp
index 8e2f6840..8cf8e71a 100644
--- a/IDEHelper/Compiler/BfAst.cpp
+++ b/IDEHelper/Compiler/BfAst.cpp
@@ -1435,6 +1435,8 @@ const char* Beefy::BfTokenToString(BfToken token)
 		return "|=";
 	case BfToken_XorEquals:
 		return "^=";
+	case BfToken_NullCoalsceEquals:
+		return "??=";
 	case BfToken_LBrace:
 		return "{";
 	case BfToken_RBrace:
@@ -1546,6 +1548,8 @@ BfBinaryOp Beefy::BfAssignOpToBinaryOp(BfAssignmentOp assignmentOp)
 		return BfBinaryOp_BitwiseOr;
 	case BfAssignmentOp_ExclusiveOr:
 		return BfBinaryOp_ExclusiveOr;
+	case BfAssignmentOp_NullCoalesce:
+		return BfBinaryOp_NullCoalesce;
 	default:
 		break;
 	}
@@ -1789,6 +1793,8 @@ BfAssignmentOp Beefy::BfTokenToAssignmentOp(BfToken token)
 		return BfAssignmentOp_BitwiseOr;
 	case BfToken_XorEquals:
 		return BfAssignmentOp_ExclusiveOr;
+	case BfToken_NullCoalsceEquals:
+		return BfAssignmentOp_NullCoalesce;
 	default:
 		return BfAssignmentOp_None;
 	}
diff --git a/IDEHelper/Compiler/BfAst.h b/IDEHelper/Compiler/BfAst.h
index eda368d0..acaca210 100644
--- a/IDEHelper/Compiler/BfAst.h
+++ b/IDEHelper/Compiler/BfAst.h
@@ -198,6 +198,7 @@ enum BfToken : uint8
 	BfToken_PlusEquals,
 	BfToken_MinusEquals,
 	BfToken_MultiplyEquals,
+
 	BfToken_DivideEquals,
 	BfToken_ModulusEquals,
 	BfToken_ShiftLeftEquals,
@@ -205,6 +206,7 @@ enum BfToken : uint8
 	BfToken_AndEquals,
 	BfToken_OrEquals,
 	BfToken_XorEquals,
+	BfToken_NullCoalsceEquals,
 	BfToken_LBrace,
 	BfToken_RBrace,
 	BfToken_LParen,
@@ -1753,7 +1755,8 @@ enum BfAssignmentOp
 	BfAssignmentOp_ShiftRight,
 	BfAssignmentOp_BitwiseAnd,
 	BfAssignmentOp_BitwiseOr,
-	BfAssignmentOp_ExclusiveOr
+	BfAssignmentOp_ExclusiveOr,
+	BfAssignmentOp_NullCoalesce
 };
 
 enum BfUnaryOp
diff --git a/IDEHelper/Compiler/BfExprEvaluator.cpp b/IDEHelper/Compiler/BfExprEvaluator.cpp
index 8fc89232..20225363 100644
--- a/IDEHelper/Compiler/BfExprEvaluator.cpp
+++ b/IDEHelper/Compiler/BfExprEvaluator.cpp
@@ -4382,6 +4382,11 @@ void BfExprEvaluator::ResolveArgValues(BfResolvedArgs& resolvedArgs, BfResolveAr
 				resolvedArg.mArgFlags = (BfArgFlags)(resolvedArg.mArgFlags | BfArgFlag_ParamsExpr);				
 			}
 		}
+		else if (auto uninitExpr = BfNodeDynCast<BfUninitializedExpression>(argExpr))
+		{			
+			resolvedArg.mArgFlags = (BfArgFlags)(resolvedArg.mArgFlags | BfArgFlag_UninitializedExpr);
+			handled = true;
+		}
 
 		/*else if (auto castExpr = BfNodeDynCast<BfCastExpression>(argExpr))
 		{
@@ -5983,11 +5988,15 @@ BfTypedValue BfExprEvaluator::CreateCall(BfAstNode* targetSrc, const BfTypedValu
 			else if (argExprIdx >= 0)
 			{	
 				BfParamKind paramKind = BfParamKind_Normal;
+				BfIdentifierNode* paramNameNode = NULL;
 				if (paramIdx < methodInstance->GetParamCount())
+				{
 					paramKind = methodInstance->GetParamKind(paramIdx);
+					paramNameNode = methodInstance->GetParamNameNode(paramIdx);
+				}
 
 				argValues[argExprIdx].mExpectedType = wantType;
-				argValue = ResolveArgValue(argValues[argExprIdx], wantType, NULL, paramKind);
+				argValue = ResolveArgValue(argValues[argExprIdx], wantType, NULL, paramKind, paramNameNode);
 			}
 		}
 		
@@ -6103,7 +6112,7 @@ BfTypedValue BfExprEvaluator::CreateCall(BfAstNode* targetSrc, const BfTypedValu
 		{
 			mModule->AssertErrorState();
 			auto argValue = argValues[argIdx].mTypedValue;		
-			if ((argValues[argIdx].mArgFlags & (BfArgFlag_DelegateBindAttempt | BfArgFlag_LambdaBindAttempt | BfArgFlag_UnqualifiedDotAttempt | BfArgFlag_DeferredEval | BfArgFlag_VariableDeclaration)) != 0)
+			if ((argValues[argIdx].mArgFlags & (BfArgFlag_DelegateBindAttempt | BfArgFlag_LambdaBindAttempt | BfArgFlag_UnqualifiedDotAttempt | BfArgFlag_DeferredEval | BfArgFlag_VariableDeclaration | BfArgFlag_UninitializedExpr)) != 0)
 			{
 				if (!argValue)
 				{
@@ -6364,8 +6373,8 @@ BfTypedValue BfExprEvaluator::MatchConstructor(BfAstNode* targetSrc, BfMethodBou
 
 static int sInvocationIdx = 0;
 
-BfTypedValue BfExprEvaluator::ResolveArgValue(BfResolvedArg& resolvedArg, BfType* wantType, BfTypedValue* receivingValue, BfParamKind paramKind)
-{	
+BfTypedValue BfExprEvaluator::ResolveArgValue(BfResolvedArg& resolvedArg, BfType* wantType, BfTypedValue* receivingValue, BfParamKind paramKind, BfIdentifierNode* paramNameNode)
+{
 	BfTypedValue argValue = resolvedArg.mTypedValue;
 	if ((resolvedArg.mArgFlags & (BfArgFlag_DelegateBindAttempt | BfArgFlag_LambdaBindAttempt | BfArgFlag_UnqualifiedDotAttempt | BfArgFlag_DeferredEval)) != 0)
 	{
@@ -6410,14 +6419,14 @@ BfTypedValue BfExprEvaluator::ResolveArgValue(BfResolvedArg& resolvedArg, BfType
 	{
 		argValue = mModule->GetDefaultTypedValue(wantType);
 	}
-	else if ((resolvedArg.mArgFlags & (BfArgFlag_VariableDeclaration)) != 0)
+	else if ((resolvedArg.mArgFlags & (BfArgFlag_VariableDeclaration | BfArgFlag_UninitializedExpr)) != 0)
 	{
 		auto variableDeclaration = BfNodeDynCast<BfVariableDeclaration>(resolvedArg.mExpression);
 
 		auto variableType = wantType;
 
-		bool isLet = variableDeclaration->mTypeRef->IsExact<BfLetTypeReference>();
-		bool isVar = variableDeclaration->mTypeRef->IsExact<BfVarTypeReference>();
+		bool isLet = (variableDeclaration != NULL) && (variableDeclaration->mTypeRef->IsExact<BfLetTypeReference>());
+		bool isVar = (variableDeclaration == NULL) || (variableDeclaration->mTypeRef->IsExact<BfVarTypeReference>());
 
 		if (mModule->mCurMethodState->mPendingNullConditional != NULL)
 		{
@@ -6439,18 +6448,31 @@ BfTypedValue BfExprEvaluator::ResolveArgValue(BfResolvedArg& resolvedArg, BfType
 			variableType = refType->mElementType;
 		}
 
-		if (variableDeclaration->mInitializer != NULL)
+		if ((variableDeclaration != NULL) && (variableDeclaration->mInitializer != NULL))
 		{
 			mModule->Fail("Initializers cannot be used when declaring variables for 'out' parameters", variableDeclaration->mEqualsNode);
 			mModule->CreateValueFromExpression(variableDeclaration->mInitializer, variableType, BfEvalExprFlags_NoCast);
 		}
-
-		if (variableDeclaration->mNameNode == NULL)
-			return argValue;
-
+		
 		BfLocalVariable* localVar = new BfLocalVariable();
-		localVar->mName = variableDeclaration->mNameNode->ToString();
-		localVar->mNameNode = BfNodeDynCast<BfIdentifierNode>(variableDeclaration->mNameNode);
+		if ((variableDeclaration != NULL) && (variableDeclaration->mNameNode != NULL))
+		{
+			localVar->mName = variableDeclaration->mNameNode->ToString();
+			localVar->mNameNode = BfNodeDynCast<BfIdentifierNode>(variableDeclaration->mNameNode);
+		}
+		else
+		{			
+			if (paramNameNode != NULL)
+			{
+				localVar->mName = "__";
+				paramNameNode->ToString(localVar->mName);
+				localVar->mName += "_";
+				localVar->mName += StrFormat("%d", mModule->mCurMethodState->GetRootMethodState()->mCurLocalVarId);
+			}
+			else
+				localVar->mName = "__" + StrFormat("%d", mModule->mCurMethodState->GetRootMethodState()->mCurLocalVarId);
+		}
+		
 		localVar->mResolvedType = variableType;
 		if (!variableType->IsValuelessType())
 			localVar->mAddr = mModule->CreateAlloca(variableType);
@@ -16196,6 +16218,13 @@ void BfExprEvaluator::PerformAssignment(BfAssignmentExpression* assignExpr, bool
 					if (!mModule->CanCast(rightValue, paramType))
 						continue;
 
+					mModule->SetElementType(assignExpr->mOpToken, BfSourceElementType_Method);					
+					if ((autoComplete != NULL) && (autoComplete->IsAutocompleteNode(assignExpr->mOpToken)))
+					{						
+						if (operatorDef->mOperatorDeclaration != NULL)
+							autoComplete->SetDefinitionLocation(operatorDef->mOperatorDeclaration->mOpTypeToken);
+					}
+
 					auto moduleMethodInstance = mModule->GetMethodInstance(checkTypeInst, operatorDef, BfTypeVector());
 
 					BfExprEvaluator exprEvaluator(mModule);
diff --git a/IDEHelper/Compiler/BfExprEvaluator.h b/IDEHelper/Compiler/BfExprEvaluator.h
index 4fb73734..c38d76dd 100644
--- a/IDEHelper/Compiler/BfExprEvaluator.h
+++ b/IDEHelper/Compiler/BfExprEvaluator.h
@@ -17,7 +17,8 @@ enum BfArgFlags
 	BfArgFlag_DeferredEval = 0x40,
 	BfArgFlag_ExpectedTypeCast = 0x80,
 	BfArgFlag_VariableDeclaration = 0x100,
-	BfArgFlag_ParamsExpr = 0x200
+	BfArgFlag_ParamsExpr = 0x200,
+	BfArgFlag_UninitializedExpr = 0x400
 };
 
 enum BfResolveArgFlags
@@ -347,7 +348,7 @@ public:
 	void ResolveGenericType();	
 	void ResolveArgValues(BfResolvedArgs& resolvedArgs, BfResolveArgFlags flags = BfResolveArgFlag_None);
 	BfAllocTarget ResolveAllocTarget(BfAstNode* newNode, BfTokenNode*& newToken, BfCustomAttributes** outCustomAttributes = NULL);
-	BfTypedValue ResolveArgValue(BfResolvedArg& resolvedArg, BfType* wantType, BfTypedValue* receivingValue = NULL, BfParamKind paramKind = BfParamKind_Normal);
+	BfTypedValue ResolveArgValue(BfResolvedArg& resolvedArg, BfType* wantType, BfTypedValue* receivingValue = NULL, BfParamKind paramKind = BfParamKind_Normal, BfIdentifierNode* paramNameNode = NULL);
 	BfMethodDef* GetPropertyMethodDef(BfPropertyDef* propDef, BfMethodType methodType, BfCheckedKind checkedKind, BfTypedValue propTarget);
 	BfModuleMethodInstance GetPropertyMethodInstance(BfMethodDef* methodDef);
 	void CheckPropFail(BfMethodDef* propMethodDef, BfMethodInstance* methodInstance, bool checkProt);
diff --git a/IDEHelper/Compiler/BfParser.cpp b/IDEHelper/Compiler/BfParser.cpp
index fe80ef6f..801d2079 100644
--- a/IDEHelper/Compiler/BfParser.cpp
+++ b/IDEHelper/Compiler/BfParser.cpp
@@ -1494,8 +1494,14 @@ void BfParser::NextToken(int endIdx)
 		case '?':
 			if (mSrc[mSrcIdx] == '?')
 			{
-				mToken = BfToken_DblQuestion;
 				mTokenEnd = ++mSrcIdx;
+				if (mSrc[mSrcIdx] == '=')
+				{
+					mToken = BfToken_NullCoalsceEquals;
+					mTokenEnd = ++mSrcIdx;
+				}
+				else
+					mToken = BfToken_DblQuestion;
 			}
 			else if (mSrc[mSrcIdx] == '.')
 			{