oh dear

mscorlib/System/Diagnostics/ConditionalAttribute.cs

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+using System;
+using System.Runtime.InteropServices;
+using Cpp2IlInjected;
+
+namespace System.Diagnostics
+{
+	/// <summary>Indicates to compilers that a method call or attribute should be ignored unless a specified conditional compilation symbol is defined.</summary>
+	// Token: 0x02000617 RID: 1559
+	[Token(Token = "0x2000617")]
+	[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+	[ComVisible(true)]
+	[Serializable]
+	public sealed class ConditionalAttribute : Attribute
+	{
+		/// <summary>Initializes a new instance of the <see cref="T:System.Diagnostics.ConditionalAttribute" /> class.</summary>
+		/// <param name="conditionString">A string that specifies the case-sensitive conditional compilation symbol that is associated with the attribute.</param>
+		// Token: 0x06002F61 RID: 12129 RVA: 0x00002050 File Offset: 0x00000250
+		[Token(Token = "0x6002F61")]
+		[Address(RVA = "0x462000", Offset = "0x460E00", VA = "0x180462000")]
+		public ConditionalAttribute(string conditionString)
+		{
+		}
+
+		// Token: 0x04001A57 RID: 6743
+		[global::Cpp2IlInjected.FieldOffset(Offset = "0x10")]
+		[Token(Token = "0x4001A57")]
+		private string m_conditionString;
+	}
+}