diff --git a/ICSharpCode.Decompiler/IL/Instructions.cs b/ICSharpCode.Decompiler/IL/Instructions.cs
index 51f32fa88..bab4c163a 100644
--- a/ICSharpCode.Decompiler/IL/Instructions.cs
+++ b/ICSharpCode.Decompiler/IL/Instructions.cs
@@ -743,12 +743,6 @@ namespace ICSharpCode.Decompiler.IL
 			base.Disconnected();
 		}
 		
-		internal override void CheckInvariant(ILPhase phase)
-		{
-			base.CheckInvariant(phase);
-			Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
-			Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
-		}
 		public static readonly SlotInfo InitSlot = new SlotInfo("Init", canInlineInto: true);
 		ILInstruction init;
 		public ILInstruction Init {
@@ -851,6 +845,12 @@ namespace ICSharpCode.Decompiler.IL
 			var o = other as PinnedRegion;
 			return o != null && variable == o.variable && this.init.PerformMatch(o.init, ref match) && this.body.PerformMatch(o.body, ref match);
 		}
+		internal override void CheckInvariant(ILPhase phase)
+		{
+			base.CheckInvariant(phase);
+			Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
+			Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
+		}
 	}
 }
 namespace ICSharpCode.Decompiler.IL
@@ -1771,12 +1771,6 @@ namespace ICSharpCode.Decompiler.IL
 			base.Disconnected();
 		}
 		
-		internal override void CheckInvariant(ILPhase phase)
-		{
-			base.CheckInvariant(phase);
-			Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
-			Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
-		}
 		public static readonly SlotInfo ResourceExpressionSlot = new SlotInfo("ResourceExpression", canInlineInto: true);
 		ILInstruction resourceExpression;
 		public ILInstruction ResourceExpression {
@@ -1868,6 +1862,12 @@ namespace ICSharpCode.Decompiler.IL
 			var o = other as UsingInstruction;
 			return o != null && variable == o.variable && this.resourceExpression.PerformMatch(o.resourceExpression, ref match) && this.body.PerformMatch(o.body, ref match);
 		}
+		internal override void CheckInvariant(ILPhase phase)
+		{
+			base.CheckInvariant(phase);
+			Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
+			Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
+		}
 	}
 }
 namespace ICSharpCode.Decompiler.IL
@@ -2107,12 +2107,6 @@ namespace ICSharpCode.Decompiler.IL
 			base.Disconnected();
 		}
 		
-		internal override void CheckInvariant(ILPhase phase)
-		{
-			base.CheckInvariant(phase);
-			Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
-			Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
-		}
 		public override StackType ResultType { get { return variable.StackType; } }
 		protected override InstructionFlags ComputeFlags()
 		{
@@ -2147,6 +2141,12 @@ namespace ICSharpCode.Decompiler.IL
 			var o = other as LdLoc;
 			return o != null && variable == o.variable;
 		}
+		internal override void CheckInvariant(ILPhase phase)
+		{
+			base.CheckInvariant(phase);
+			Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
+			Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
+		}
 	}
 }
 namespace ICSharpCode.Decompiler.IL
@@ -2192,12 +2192,6 @@ namespace ICSharpCode.Decompiler.IL
 			base.Disconnected();
 		}
 		
-		internal override void CheckInvariant(ILPhase phase)
-		{
-			base.CheckInvariant(phase);
-			Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
-			Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
-		}
 		public override void WriteTo(ITextOutput output, ILAstWritingOptions options)
 		{
 			ILRange.WriteTo(output, options);
@@ -2222,6 +2216,12 @@ namespace ICSharpCode.Decompiler.IL
 			var o = other as LdLoca;
 			return o != null && variable == o.variable;
 		}
+		internal override void CheckInvariant(ILPhase phase)
+		{
+			base.CheckInvariant(phase);
+			Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
+			Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
+		}
 	}
 }
 namespace ICSharpCode.Decompiler.IL
diff --git a/ICSharpCode.Decompiler/IL/Instructions.tt b/ICSharpCode.Decompiler/IL/Instructions.tt
index 35246b94b..f6b1ea55b 100644
--- a/ICSharpCode.Decompiler/IL/Instructions.tt
+++ b/ICSharpCode.Decompiler/IL/Instructions.tt
@@ -338,6 +338,15 @@ namespace <#=opCode.Namespace#>
 			var o = other as <#=opCode.Name#>;
 			return <#=string.Join(" && ", opCode.PerformMatchConditions)#>;
 		}
+<#		} #>
+<#		if (opCode.Invariants.Count > 0) { #>
+		internal override void CheckInvariant(ILPhase phase)
+		{
+			base.CheckInvariant(phase);
+<#			foreach (var invariant in opCode.Invariants) {#>
+			<#=invariant#>
+<#			} #>
+		}
 <#		} #>
 	}
 }
@@ -485,6 +494,7 @@ namespace ICSharpCode.Decompiler.IL
 		public bool GeneratePerformMatch = true;
 		public List<MatchParamInfo> MatchParameters = new List<MatchParamInfo>();
 		public List<string> PerformMatchConditions = new List<string>() { "o != null" };
+		public List<string> Invariants = new List<string>();
 
 		public string BaseClass = "ILInstruction";
 		public List<string> Interfaces = new List<string>();
@@ -680,6 +690,7 @@ namespace ICSharpCode.Decompiler.IL
 		
 		public bool IsCollection;
 		public bool CanInlineInto;
+		public string[] ExpectedTypes;
 		
 		public ChildInfo(string name)
 		{
@@ -756,6 +767,14 @@ namespace ICSharpCode.Decompiler.IL
 						+ "\t}" + Environment.NewLine
 						+ "}");
 				}
+				if (children[i].ExpectedTypes?.Length > 0) {
+					foreach (var expectedType in children[i].ExpectedTypes) {
+						var expectedTypeCode = expectedType;
+						if (!expectedType.Contains("."))
+							expectedTypeCode = "StackType." + expectedTypeCode;
+						opCode.Invariants.Add("Debug.Assert(" + arg + ".ResultType == " + expectedTypeCode + ");");
+					}
+				}
 			}
 			opCode.WriteArguments.Add("output.Write(')');");
 			StringBuilder b;
@@ -917,12 +936,8 @@ protected override void Disconnected()
 }
 ".Replace("Access", accessType));
 			if (generateCheckInvariant) {
-				opCode.Members.Add(@"internal override void CheckInvariant(ILPhase phase)
-{
-	base.CheckInvariant(phase);
-	Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));
-	Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);
-}");
+				opCode.Invariants.Add("Debug.Assert(phase <= ILPhase.InILReader || this.IsDescendantOf(variable.Function));");
+				opCode.Invariants.Add("Debug.Assert(phase <= ILPhase.InILReader || variable.Function.Variables[variable.IndexInFunction] == variable);");
 			}
 		};
 		if (accessType == "Load") {