Adding Obsolete/Error/Warn attributes, devirt fixes for struct ptr

BeefLibs/corlib/src/Attribute.bf

@@ -319,7 +319,6 @@ namespace System
 	{
 	}
 
-
 	/// Generally used as a per-method optimization, [DisableObjectAccessChecks] will avoid the runtime per-object-access
 	/// checks which by default are only applied in debug builds anyway.
 	[AttributeUsage(AttributeTargets.Method/*, AlwaysIncludeTarget=true*/)]
@@ -327,6 +326,38 @@ namespace System
 	{
 	}
 
+	[AttributeUsage(.Method | .Constructor)]
+	public struct ObsoleteAttribute : Attribute
+	{
+		public this(bool isError)
+		{
+
+		}
+
+		public this(String error, bool isError)
+		{
+
+		}
+	}
+
+	[AttributeUsage(.Method | .Constructor)]
+	public struct ErrorAttribute : Attribute
+	{
+		public this(String error)
+		{
+
+		}
+	}
+
+	[AttributeUsage(.Method | .Constructor)]
+	public struct WarnAttribute : Attribute
+	{
+		public this(String error)
+		{
+
+		}
+	}
+
 	/// If [NoDiscard] is used on a method, the the compiler will show a warning if the result is discarded.
 	/// If used on a type, the compiler will show an warning if any method returns that type and the caller discards the result.
 	[AttributeUsage(.Method | .Class | .Struct)]