Use "static abstract" instead of "abstract static".

ICSharpCode.Decompiler.Tests/TestCases/Pretty/StaticAbstractInterfaceMembers.cs

@@ -4,11 +4,11 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty.StaticAbstractInterfaceM
 {
 	public interface I
 	{
-		abstract static int Capacity { get; }
-		abstract static int Count { get; set; }
-		abstract static int SetterOnly { set; }
-		abstract static event EventHandler E;
-		abstract static I CreateI();
+		static abstract int Capacity { get; }
+		static abstract int Count { get; set; }
+		static abstract int SetterOnly { set; }
+		static abstract event EventHandler E;
+		static abstract I CreateI();
 	}
 
 	public class X : I
@@ -72,7 +72,7 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty.StaticAbstractInterfaceM
 
 		public interface IGetNext<T> where T : IGetNext<T>
 		{
-			abstract static T operator ++(T other);
+			static abstract T operator ++(T other);
 		}
 
 		public struct WrappedInteger : IGetNext<WrappedInteger>

ICSharpCode.Decompiler/CSharp/Syntax/CSharpModifierToken.cs

@@ -66,7 +66,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 			Modifiers.Public, Modifiers.Private, Modifiers.Protected, Modifiers.Internal,
 			Modifiers.New,
 			Modifiers.Unsafe,
-			Modifiers.Abstract, Modifiers.Virtual, Modifiers.Sealed, Modifiers.Static, Modifiers.Override,
+			Modifiers.Static, Modifiers.Abstract, Modifiers.Virtual, Modifiers.Sealed, Modifiers.Override,
 			Modifiers.Required, Modifiers.Readonly, Modifiers.Volatile,
 			Modifiers.Ref,
 			Modifiers.Extern, Modifiers.Partial, Modifiers.Const,