diff --git a/BeefLibs/Beefy2D/src/BFWindow.bf b/BeefLibs/Beefy2D/src/BFWindow.bf
index 02778bc1..482ee9ab 100644
--- a/BeefLibs/Beefy2D/src/BFWindow.bf
+++ b/BeefLibs/Beefy2D/src/BFWindow.bf
@@ -49,6 +49,7 @@ namespace Beefy
 			ShowMaximized = 0x0400'0000,
         };
 
+		[AllowDuplicates]
         public enum HitTestResult
         {
             NotHandled = -3,
diff --git a/BeefLibs/Beefy2D/src/widgets/KeyCode.bf b/BeefLibs/Beefy2D/src/widgets/KeyCode.bf
index 734cf6d6..c531c727 100644
--- a/BeefLibs/Beefy2D/src/widgets/KeyCode.bf
+++ b/BeefLibs/Beefy2D/src/widgets/KeyCode.bf
@@ -18,14 +18,17 @@ namespace Beefy.widgets
         Shift = 0x10,
         Control = 0x11,
         Alt = 0x12,
+#unwarn
         Menu = 0x12,
 		Pause = 0x13,
         Capital = 0x14,
         Kana = 0x15,
+#unwarn
         Hangul = 0x15,
         Junja = 0x17,
         Final = 0x18,
         Hanja = 0x19,
+#unwarn
         Kanji = 0x19,
         Escape = 0x1B,
         Convert = 0x1C,
diff --git a/BeefLibs/SDL2/src/SDL2.bf b/BeefLibs/SDL2/src/SDL2.bf
index cf6ddf0b..c61d910f 100644
--- a/BeefLibs/SDL2/src/SDL2.bf
+++ b/BeefLibs/SDL2/src/SDL2.bf
@@ -1521,6 +1521,7 @@ namespace SDL2
 			ArrayF32
 		}
 
+		[AllowDuplicates]
 		public enum SDL_PIXELORDER_ENUM : uint32
 		{
 			/* BITMAPORDER */
@@ -2967,6 +2968,7 @@ namespace SDL2
 			void* userdata
 		);
 
+		[AllowDuplicates]
 		enum EventState : int32
 		{
 			Query = -1,
@@ -3272,6 +3274,7 @@ namespace SDL2
 		 * and all of the names are in an anonymous enum. Yeah...
 		 * that's not going to cut it for C#. We'll just put them in an
 		 * enum for now? */
+		[AllowDuplicates]
 		public enum Keycode : uint32
 		{
 			UNKNOWN = 0,
diff --git a/BeefLibs/corlib/src/Attribute.bf b/BeefLibs/corlib/src/Attribute.bf
index 8269f27c..72dcdf2f 100644
--- a/BeefLibs/corlib/src/Attribute.bf
+++ b/BeefLibs/corlib/src/Attribute.bf
@@ -237,6 +237,12 @@ namespace System
 		}
 	}
 
+	[AttributeUsage(.Enum)]
+	public struct AllowDuplicatesAttribute : Attribute
+	{
+	    
+	}
+
 	[AttributeUsage(.Class | .Struct)]
 	public struct UnionAttribute : Attribute
 	{
diff --git a/IDE/mintest/minlib/src/System/Attribute.bf b/IDE/mintest/minlib/src/System/Attribute.bf
index 6892b9fe..b448f6ca 100644
--- a/IDE/mintest/minlib/src/System/Attribute.bf
+++ b/IDE/mintest/minlib/src/System/Attribute.bf
@@ -251,6 +251,12 @@ namespace System
 		}
 	}
 
+	[AttributeUsage(.Enum)]
+	public struct AllowDuplicatesAttribute : Attribute
+	{
+	    
+	}
+
 	[AttributeUsage(.Class | .Struct)]
 	public struct UnionAttribute : Attribute
 	{
diff --git a/IDE/mintest/minlib/src/System/Type.bf b/IDE/mintest/minlib/src/System/Type.bf
index ad1daa7e..4e28cedf 100644
--- a/IDE/mintest/minlib/src/System/Type.bf
+++ b/IDE/mintest/minlib/src/System/Type.bf
@@ -848,6 +848,7 @@ namespace System.Reflection
 		EnumDiscriminator		= 0x0200
     }
 
+	[AllowDuplicates]
 	public enum MethodFlags : int16
 	{
 		MethodAccessMask    	=  0x0007,
@@ -869,6 +870,7 @@ namespace System.Reflection
 
 		// vtable layout mask - Use this mask to retrieve vtable attributes.
 		VtableLayoutMask    	=  0x0100,
+
 		ReuseSlot           	=  0x0000,     // The default.
 		NewSlot             	=  0x0100,     // Method always gets a new slot in the vtable.
 		// end vtable layout mask
diff --git a/IDE/mintest/src/main3.bf b/IDE/mintest/src/main3.bf
index 9cb29869..f0585e42 100644
--- a/IDE/mintest/src/main3.bf
+++ b/IDE/mintest/src/main3.bf
@@ -8,11 +8,14 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Threading;
 
+[AllowDuplicates]
 enum EnumA
 {
 	Abo = 1,
 	Boop = _*2,
 	Croop = _*2,
+
+	Zoop = 1
 }
 
 struct Blurg
diff --git a/IDEHelper/Compiler/BfAst.cpp b/IDEHelper/Compiler/BfAst.cpp
index 0918d2af..1dd0b7b6 100644
--- a/IDEHelper/Compiler/BfAst.cpp
+++ b/IDEHelper/Compiler/BfAst.cpp
@@ -762,6 +762,15 @@ bool BfAstNode::IsExpression()
 	return IsA<BfExpression>();
 }
 
+bool BfAstNode::WantsWarning(int warningNumber)
+{
+	auto parserData = GetParserData();
+	if (parserData == NULL)
+		return true;
+	int srcStart = GetSrcStart();
+	return (!parserData->IsUnwarnedAt(this)) && (parserData->IsWarningEnabledAtSrcIndex(warningNumber, GetSrcStart()));
+}
+
 bool BfAstNode::LocationEquals(BfAstNode* otherNode)
 {	
 	return (GetSourceData() == otherNode->GetSourceData()) &&
diff --git a/IDEHelper/Compiler/BfAst.h b/IDEHelper/Compiler/BfAst.h
index 4b4e15d0..5b6572da 100644
--- a/IDEHelper/Compiler/BfAst.h
+++ b/IDEHelper/Compiler/BfAst.h
@@ -1040,6 +1040,7 @@ public:
 	void Add(BfAstNode* bfAstNode);
 	bool IsMissingSemicolon();
 	bool IsExpression();
+	bool WantsWarning(int warningNumber);
 	
 	template <typename T>
 	bool IsA()
diff --git a/IDEHelper/Compiler/BfCompiler.cpp b/IDEHelper/Compiler/BfCompiler.cpp
index c690f9fc..41706047 100644
--- a/IDEHelper/Compiler/BfCompiler.cpp
+++ b/IDEHelper/Compiler/BfCompiler.cpp
@@ -382,6 +382,7 @@ BfCompiler::BfCompiler(BfSystem* bfSystem, bool isResolveOnly)
 	mImportAttributeTypeDef = NULL;
 	mCReprAttributeTypeDef = NULL;
 	mAlignAttributeTypeDef = NULL;
+	mAllowDuplicatesAttributeTypeDef = NULL;
 	mNoDiscardAttributeTypeDef = NULL;
 	mDisableChecksAttributeTypeDef = NULL;
 	mDisableObjectAccessChecksAttributeTypeDef = NULL;
@@ -5856,6 +5857,7 @@ bool BfCompiler::DoCompile(const StringImpl& outputDirectory)
 	mImportAttributeTypeDef = _GetRequiredType("System.ImportAttribute");
 	mCReprAttributeTypeDef = _GetRequiredType("System.CReprAttribute");
 	mAlignAttributeTypeDef = _GetRequiredType("System.AlignAttribute");
+	mAllowDuplicatesAttributeTypeDef = _GetRequiredType("System.AllowDuplicatesAttribute");
 	mNoDiscardAttributeTypeDef = _GetRequiredType("System.NoDiscardAttribute");
 	mDisableChecksAttributeTypeDef = _GetRequiredType("System.DisableChecksAttribute");
 	mDisableObjectAccessChecksAttributeTypeDef = _GetRequiredType("System.DisableObjectAccessChecksAttribute");
diff --git a/IDEHelper/Compiler/BfCompiler.h b/IDEHelper/Compiler/BfCompiler.h
index 949a0345..896426df 100644
--- a/IDEHelper/Compiler/BfCompiler.h
+++ b/IDEHelper/Compiler/BfCompiler.h
@@ -380,6 +380,7 @@ public:
 	BfTypeDef* mImportAttributeTypeDef;
 	BfTypeDef* mCReprAttributeTypeDef;
 	BfTypeDef* mAlignAttributeTypeDef;
+	BfTypeDef* mAllowDuplicatesAttributeTypeDef;
 	BfTypeDef* mNoDiscardAttributeTypeDef;
 	BfTypeDef* mDisableChecksAttributeTypeDef;
 	BfTypeDef* mDisableObjectAccessChecksAttributeTypeDef;
diff --git a/IDEHelper/Compiler/BfExprEvaluator.cpp b/IDEHelper/Compiler/BfExprEvaluator.cpp
index dbbf6884..62b5112b 100644
--- a/IDEHelper/Compiler/BfExprEvaluator.cpp
+++ b/IDEHelper/Compiler/BfExprEvaluator.cpp
@@ -2940,7 +2940,7 @@ BfTypedValue BfExprEvaluator::LookupIdentifier(BfAstNode* refNode, const StringI
 		}		
 	}
 
-	if ((mModule->mCurMethodInstance == NULL) && (mModule->mCurTypeInstance->IsEnum()))
+	if ((mModule->mCurMethodInstance == NULL) && (mModule->mCurTypeInstance != NULL) && (mModule->mCurTypeInstance->IsEnum()))
 	{
 		if (findName == "_")
 		{
diff --git a/IDEHelper/Compiler/BfModuleTypeUtils.cpp b/IDEHelper/Compiler/BfModuleTypeUtils.cpp
index 6b65f424..00600c48 100644
--- a/IDEHelper/Compiler/BfModuleTypeUtils.cpp
+++ b/IDEHelper/Compiler/BfModuleTypeUtils.cpp
@@ -2990,7 +2990,7 @@ bool BfModule::DoPopulateType(BfType* resolvedTypeRef, BfPopulateType populateTy
 					{
 						*fieldDefPtr = fieldDef;
 					}
-					else
+					else if ((typeInstance->mCustomAttributes == NULL) || (typeInstance->mCustomAttributes->Get(mCompiler->mAllowDuplicatesAttributeTypeDef) == NULL))
 					{
 						auto error = Warn(0, StrFormat("Enum value '%lld' for field '%s' is not unique", foreignConst->mInt64, fieldDef->mName.c_str()), fieldDef->GetRefNode(), true);
 						if (error != NULL)