diff --git a/ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj b/ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj
index d543eb547..4c24bf125 100644
--- a/ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj
+++ b/ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj
@@ -124,6 +124,7 @@
     <Compile Include="Helpers\RemoveCompilerAttribute.cs" />
     <Compile Include="Helpers\Tester.cs" />
     <Compile Include="Helpers\TypeSystemHelper.cs" />
+    <Compile Include="TestCases\Pretty\LiftedOperators.cs" />
     <Compile Include="PrettyTestRunner.cs" />
     <Compile Include="RoundtripAssembly.cs" />
     <Compile Include="TestCases\Correctness\Capturing.cs" />
diff --git a/ICSharpCode.Decompiler/Tests/LiftedOperators.cs b/ICSharpCode.Decompiler/Tests/LiftedOperators.cs
deleted file mode 100644
index 426276ab0..000000000
--- a/ICSharpCode.Decompiler/Tests/LiftedOperators.cs
+++ /dev/null
@@ -1,830 +0,0 @@
-// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
-// 
-// Permission is hereby granted, free of charge, to any person obtaining a copy of this
-// software and associated documentation files (the "Software"), to deal in the Software
-// without restriction, including without limitation the rights to use, copy, modify, merge,
-// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
-// to whom the Software is furnished to do so, subject to the following conditions:
-// 
-// The above copyright notice and this permission notice shall be included in all copies or
-// substantial portions of the Software.
-// 
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
-// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
-// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
-// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-// DEALINGS IN THE SOFTWARE.
-
-using System;
-using System.Runtime.InteropServices;
-
-public static class LiftedOperators
-{
-	// C# uses 4 different patterns of IL for lifted operators: bool, other primitive types, decimal, other structs.
-	// Different patterns are used depending on whether both of the operands are nullable or only the left/right operand is nullable.
-	// Negation must not be pushed through such comparisons because it would change the semantics.
-	// A comparison used in a condition differs somewhat from a comparison used as a simple value.
-
-	public static void BoolBasic(bool? a, bool? b)
-	{
-		if (a == b)
-		{
-			Console.WriteLine();
-		}
-		if (a != b)
-		{
-			Console.WriteLine();
-		}
-
-		if (!(a == b))
-		{
-			Console.WriteLine();
-		}
-		if (!(a != b))
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void BoolComplex(bool? a, Func<bool> x)
-	{
-		if (a == x())
-		{
-			Console.WriteLine();
-		}
-		if (a != x())
-		{
-			Console.WriteLine();
-		}
-
-		if (x() == a)
-		{
-			Console.WriteLine();
-		}
-		if (x() != a)
-		{
-			Console.WriteLine();
-		}
-
-		if (!(a == x()))
-		{
-			Console.WriteLine();
-		}
-		if (!(a != x()))
-		{
-			Console.WriteLine();
-		}
-		if (!(x() == a))
-		{
-			Console.WriteLine();
-		}
-		if (!(x() != a))
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void BoolConst(bool? a)
-	{
-		if (a == true) 
-		{
-			Console.WriteLine();
-		}
-		if (a != true)
-		{
-			Console.WriteLine();
-		}
-		if (a == false)
-		{
-			Console.WriteLine();
-		}
-		if (a != false)
-		{
-			Console.WriteLine();
-		}
-		if (a ?? true) 
-		{
-		  Console.WriteLine();
-		}
-		if (a ?? false) 
-		{
-		  Console.WriteLine();
-		}
-	}
-
-	public static void BoolValueBasic(bool? a, bool? b)
-	{
-		Console.WriteLine(a == b);
-		Console.WriteLine(a != b);
-
-		Console.WriteLine(!(a == b));
-		Console.WriteLine(!(a != b));
-
-		Console.WriteLine(a & b);
-		Console.WriteLine(a | b);
-		Console.WriteLine(a ^ b);
-		Console.WriteLine(a ?? b);
-		Console.WriteLine(!a);
-		a &= b;
-		a |= b;
-		a ^= b;
-	}
-
-	public static void BoolValueComplex(bool? a, Func<bool> x)
-	{
-		Console.WriteLine(a == x());
-		Console.WriteLine(a != x());
-
-		Console.WriteLine(x() == a);
-		Console.WriteLine(x() != a);
-
-		Console.WriteLine(!(a == x()));
-		Console.WriteLine(!(a != x()));
-
-		Console.WriteLine(a & x());
-		Console.WriteLine(a | x());
-		Console.WriteLine(a ^ x());
-		Console.WriteLine(a ?? x());
-		a &= x();
-		a |= x();
-		a ^= x();
-
-		Console.WriteLine(x() ^ a);
-		(new bool?[0])[0] ^= x();
-	}
-
-	public static void BoolValueConst(bool? a)
-	{
-		Console.WriteLine(a == true);
-		Console.WriteLine(a != true);
-		Console.WriteLine(a == false);
-		Console.WriteLine(a != false);
-		Console.WriteLine(a ?? true);
-		Console.WriteLine(a ?? false);
-	}
-
-	public static void IntBasic(int? a, int? b)
-	{
-		if (a == b)
-		{
-			Console.WriteLine();
-		}
-		if (a != b)
-		{
-			Console.WriteLine();
-		}
-		if (a > b)
-		{
-			Console.WriteLine();
-		}
-		if (a < b)
-		{
-			Console.WriteLine();
-		}
-		if (a >= b)
-		{
-			Console.WriteLine();
-		}
-		if (a <= b)
-		{
-			Console.WriteLine();
-		}
-
-		if (!(a == b))
-		{
-			Console.WriteLine();
-		}
-		if (!(a != b))
-		{
-			Console.WriteLine();
-		}
-		if (!(a > b))
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void IntComplex(int? a, Func<int> x)
-	{
-		if (a == x())
-		{
-			Console.WriteLine();
-		}
-		if (a != x())
-		{
-			Console.WriteLine();
-		}
-		if (a > x())
-		{
-			Console.WriteLine();
-		}
-
-		if (x() == a)
-		{
-			Console.WriteLine();
-		}
-		if (x() != a)
-		{
-			Console.WriteLine();
-		}
-		if (x() > a)
-		{
-			Console.WriteLine();
-		}
-
-		if (!(a == x()))
-		{
-			Console.WriteLine();
-		}
-		if (!(a != x()))
-		{
-			Console.WriteLine();
-		}
-		if (!(a > x()))
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void IntConst(int? a)
-	{
-		if (a == 2)
-		{
-			Console.WriteLine();
-		}
-		if (a != 2)
-		{
-			Console.WriteLine();
-		}
-		if (a > 2)
-		{
-			Console.WriteLine();
-		}
-
-		if (2 == a)
-		{
-			Console.WriteLine();
-		}
-		if (2 != a)
-		{
-			Console.WriteLine();
-		}
-		if (2 > a)
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void IntValueBasic(int? a, int? b)
-	{
-		Console.WriteLine(a == b);
-		Console.WriteLine(a != b);
-		Console.WriteLine(a > b);
-
-		Console.WriteLine(!(a == b));
-		Console.WriteLine(!(a != b));
-		Console.WriteLine(!(a > b));
-
-		Console.WriteLine(a + b);
-		Console.WriteLine(a - b);
-		Console.WriteLine(a * b);
-		Console.WriteLine(a / b);
-		Console.WriteLine(a % b);
-		Console.WriteLine(a & b);
-		Console.WriteLine(a | b);
-		Console.WriteLine(a ^ b);
-		Console.WriteLine(a << b);
-		Console.WriteLine(a >> b);
-		Console.WriteLine(a ?? b);
-		Console.WriteLine(-a);
-		Console.WriteLine(~a);
-		// TODO:
-		//Console.WriteLine(a++);
-		//Console.WriteLine(a--);
-		Console.WriteLine(++a);
-		Console.WriteLine(--a);
-		a += b;
-		a -= b;
-		a *= b;
-		a /= b;
-		a %= b;
-		a &= b;
-		a |= b;
-		a ^= b;
-		a <<= b;
-		a >>= b;
-	}
-
-	public static void IntValueComplex(int? a, Func<int> x)
-	{
-		Console.WriteLine(a == x());
-		Console.WriteLine(a != x());
-		Console.WriteLine(a > x());
-
-		Console.WriteLine(x() == a);
-		Console.WriteLine(x() != a);
-		Console.WriteLine(x() > a);
-
-		Console.WriteLine(a + x());
-		Console.WriteLine(a - x());
-		Console.WriteLine(a * x());
-		Console.WriteLine(a / x());
-		Console.WriteLine(a % x());
-		Console.WriteLine(a & x());
-		Console.WriteLine(a | x());
-		Console.WriteLine(a ^ x());
-		Console.WriteLine(a << x());
-		Console.WriteLine(a >> x());
-		Console.WriteLine(a ?? x());
-		a += x();
-		a -= x();
-		a *= x();
-		a /= x();
-		a %= x();
-		a &= x();
-		a |= x();
-		a ^= x();
-		a <<= x();
-		a >>= x();
-
-		Console.WriteLine(x() + a);
-		(new int?[0])[0] += x();
-	}
-
-	public static void IntValueConst(int? a)
-	{
-		Console.WriteLine(a == 2);
-		Console.WriteLine(a != 2);
-		Console.WriteLine(a > 2);
-
-		Console.WriteLine(2 == a);
-		Console.WriteLine(2 != a);
-		Console.WriteLine(2 > a);
-
-		Console.WriteLine(a + 2);
-		Console.WriteLine(a - 2);
-		Console.WriteLine(a * 2);
-		Console.WriteLine(a / 2);
-		Console.WriteLine(a % 2);
-		Console.WriteLine(a & 2);
-		Console.WriteLine(a | 2);
-		Console.WriteLine(a ^ 2);
-		Console.WriteLine(a << 2);
-		Console.WriteLine(a >> 2);
-		Console.WriteLine(a ?? 2);
-		a += 2;
-		a -= 2;
-		a *= 2;
-		a /= 2;
-		a %= 2;
-		a &= 2;
-		a |= 2;
-		a ^= 2;
-		a <<= 2;
-		a >>= 2;
-
-		Console.WriteLine(2 + a);
-	}
-
-	public static void NumberBasic(decimal? a, decimal? b)
-	{
-		if (a == b)
-		{
-			Console.WriteLine();
-		}
-		if (a != b)
-		{
-			Console.WriteLine();
-		}
-		if (a > b)
-		{
-			Console.WriteLine();
-		}
-		if (a < b)
-		{
-			Console.WriteLine();
-		}
-		if (a >= b)
-		{
-			Console.WriteLine();
-		}
-		if (a <= b)
-		{
-			Console.WriteLine();
-		}
-
-		if (!(a == b))
-		{
-			Console.WriteLine();
-		}
-		if (!(a != b))
-		{
-			Console.WriteLine();
-		}
-		if (!(a > b))
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void NumberComplex(decimal? a, Func<decimal> x)
-	{
-		if (a == x())
-		{
-			Console.WriteLine();
-		}
-		if (a != x())
-		{
-			Console.WriteLine();
-		}
-		if (a > x())
-		{
-			Console.WriteLine();
-		}
-
-		if (x() == a)
-		{
-			Console.WriteLine();
-		}
-		if (x() != a)
-		{
-			Console.WriteLine();
-		}
-		if (x() > a)
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void NumberConst(decimal? a)
-	{
-		if (a == 2m)
-		{
-			Console.WriteLine();
-		}
-		if (a != 2m)
-		{
-			Console.WriteLine();
-		}
-		if (a > 2m)
-		{
-			Console.WriteLine();
-		}
-
-		if (2m == a)
-		{
-			Console.WriteLine();
-		}
-		if (2m != a)
-		{
-			Console.WriteLine();
-		}
-		if (2m > a)
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void NumberValueBasic(decimal? a, decimal? b)
-	{
-		Console.WriteLine(a == b);
-		Console.WriteLine(a != b);
-		Console.WriteLine(a > b);
-
-		Console.WriteLine(!(a == b));
-		Console.WriteLine(!(a != b));
-		Console.WriteLine(!(a > b));
-
-		Console.WriteLine(a + b);
-		Console.WriteLine(a - b);
-		Console.WriteLine(a * b);
-		Console.WriteLine(a / b);
-		Console.WriteLine(a % b);
-		Console.WriteLine(a ?? b);
-		Console.WriteLine(-a);
-		// TODO:
-		//Console.WriteLine(a++);
-		//Console.WriteLine(a--);
-		//Console.WriteLine(++a);
-		//Console.WriteLine(--a);
-		a += b;
-		a -= b;
-		a *= b;
-		a /= b;
-		a %= b;
-	}
-
-	public static void NumberValueComplex(decimal? a, Func<decimal> x)
-	{
-		Console.WriteLine(a == x());
-		Console.WriteLine(a != x());
-		Console.WriteLine(a > x());
-
-		Console.WriteLine(x() == a);
-		Console.WriteLine(x() != a);
-		Console.WriteLine(x() > a);
-
-		Console.WriteLine(a + x());
-		Console.WriteLine(a - x());
-		Console.WriteLine(a * x());
-		Console.WriteLine(a / x());
-		Console.WriteLine(a % x());
-		Console.WriteLine(a ?? x());
-		a += x();
-		a -= x();
-		a *= x();
-		a /= x();
-		a %= x();
-
-		Console.WriteLine(x() + a);
-		(new decimal?[0])[0] += x();
-	}
-
-	public static void NumberValueConst(decimal? a)
-	{
-		Console.WriteLine(a == 2m);
-		Console.WriteLine(a != 2m);
-		Console.WriteLine(a > 2m);
-
-		Console.WriteLine(2m == a);
-		Console.WriteLine(2m != a);
-		Console.WriteLine(2m > a);
-
-		Console.WriteLine(a + 2m);
-		Console.WriteLine(a - 2m);
-		Console.WriteLine(a * 2m);
-		Console.WriteLine(a / 2m);
-		Console.WriteLine(a % 2m);
-		Console.WriteLine(a ?? 2m);
-		a += 2m;
-		a -= 2m;
-		a *= 2m;
-		a /= 2m;
-		a %= 2m;
-
-		Console.WriteLine(2m + a);
-	}
-
-	public static void StructBasic(TS? a, TS? b)
-	{
-		if (a == b)
-		{
-			Console.WriteLine();
-		}
-		if (a != b)
-		{
-			Console.WriteLine();
-		}
-		if (a > b)
-		{
-			Console.WriteLine();
-		}
-		if (a < b)
-		{
-			Console.WriteLine();
-		}
-		if (a >= b)
-		{
-			Console.WriteLine();
-		}
-		if (a <= b)
-		{
-			Console.WriteLine();
-		}
-
-		if (!(a == b))
-		{
-			Console.WriteLine();
-		}
-		if (!(a != b))
-		{
-			Console.WriteLine();
-		}
-		if (!(a > b))
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void StructComplex(TS? a, Func<TS> x)
-	{
-		if (a == x())
-		{
-			Console.WriteLine();
-		}
-		if (a != x())
-		{
-			Console.WriteLine();
-		}
-		if (a > x())
-		{
-			Console.WriteLine();
-		}
-
-		if (x() == a)
-		{
-			Console.WriteLine();
-		}
-		if (x() != a)
-		{
-			Console.WriteLine();
-		}
-		if (x() > a)
-		{
-			Console.WriteLine();
-		}
-	}
-
-	public static void StructValueBasic(TS? a, TS? b, int? i)
-	{
-		Console.WriteLine(a == b);
-		Console.WriteLine(a != b);
-		Console.WriteLine(a > b);
-
-		Console.WriteLine(!(a == b));
-		Console.WriteLine(!(a != b));
-		Console.WriteLine(!(a > b));
-
-		Console.WriteLine(a + b);
-		Console.WriteLine(a - b);
-		Console.WriteLine(a * b);
-		Console.WriteLine(a / b);
-		Console.WriteLine(a % b);
-		Console.WriteLine(a & b);
-		Console.WriteLine(a | b);
-		Console.WriteLine(a ^ b);
-		Console.WriteLine(a << i);
-		Console.WriteLine(a >> i);
-		Console.WriteLine(a ?? b);
-		Console.WriteLine(+a);
-		Console.WriteLine(-a);
-		Console.WriteLine(!a);
-		Console.WriteLine(~a);
-		// TODO:
-		//Console.WriteLine(a++);
-		//Console.WriteLine(a--);
-		//Console.WriteLine(++a);
-		//Console.WriteLine(--a);
-		//Console.WriteLine((int?)a);
-		a += b;
-		a -= b;
-		a *= b;
-		a /= b;
-		a %= b;
-		a &= b;
-		a |= b;
-		a ^= b;
-		a <<= i;
-		a >>= i;
-	}
-
-	public static void StructValueComplex(TS? a, Func<TS> x, Func<int> i)
-	{
-		Console.WriteLine(a == x());
-		Console.WriteLine(a != x());
-		Console.WriteLine(a > x());
-
-		Console.WriteLine(x() == a);
-		Console.WriteLine(x() != a);
-		Console.WriteLine(x() > a);
-
-		Console.WriteLine(a + x());
-		Console.WriteLine(a - x());
-		Console.WriteLine(a * x());
-		Console.WriteLine(a / x());
-		Console.WriteLine(a % x());
-		Console.WriteLine(a & x());
-		Console.WriteLine(a | x());
-		Console.WriteLine(a ^ x());
-		Console.WriteLine(a << i());
-		Console.WriteLine(a >> i());
-		Console.WriteLine(a ?? x());
-		a += x();
-		a -= x();
-		a *= x();
-		a /= x();
-		a %= x();
-		a &= x();
-		a |= x();
-		a ^= x();
-		a <<= i();
-		a >>= i();
-
-		Console.WriteLine(x() + a);
-		(new TS?[0])[0] += x();
-	}
-}
-
-// dummy structure for testing custom operators
-[StructLayout(LayoutKind.Sequential, Size = 1)]
-public struct TS
-{
-	// unary
-	public static TS operator +(TS a)
-	{
-		throw null;
-	}
-	public static TS operator -(TS a)
-	{
-		throw null;
-	}
-	public static TS operator !(TS a)
-	{
-		throw null;
-	}
-	public static TS operator ~(TS a)
-	{
-		throw null;
-	}
-	public static TS operator ++(TS a)
-	{
-		throw null;
-	}
-	public static TS operator --(TS a)
-	{
-		throw null;
-	}
-
-	public static explicit operator int(TS a)
-	{
-		throw null;
-	}
-
-	// binary
-	public static TS operator +(TS a, TS b)
-	{
-		throw null;
-	}
-	public static TS operator -(TS a, TS b)
-	{
-		throw null;
-	}
-	public static TS operator *(TS a, TS b)
-	{
-		throw null;
-	}
-	public static TS operator /(TS a, TS b)
-	{
-		throw null;
-	}
-	public static TS operator %(TS a, TS b)
-	{
-		throw null;
-	}
-	public static TS operator &(TS a, TS b)
-	{
-		throw null;
-	}
-	public static TS operator |(TS a, TS b)
-	{
-		throw null;
-	}
-	public static TS operator ^(TS a, TS b)
-	{
-		throw null;
-	}
-	public static TS operator <<(TS a, int b)
-	{
-		throw null;
-	}
-	public static TS operator >>(TS a, int b)
-	{
-		throw null;
-	}
-
-	// comparisons
-	public static bool operator ==(TS a, TS b)
-	{
-		throw null;
-	}
-	public static bool operator !=(TS a, TS b)
-	{
-		throw null;
-	}
-	public static bool operator <(TS a, TS b)
-	{
-		throw null;
-	}
-	public static bool operator <=(TS a, TS b)
-	{
-		throw null;
-	}
-	public static bool operator >(TS a, TS b)
-	{
-		throw null;
-	}
-	public static bool operator >=(TS a, TS b)
-	{
-		throw null;
-	}
-
-	public override bool Equals(object obj)
-	{
-		throw null;
-	}
-	public override int GetHashCode()
-	{
-		throw null;
-	}
-}
diff --git a/ICSharpCode.Decompiler/Tests/PrettyTestRunner.cs b/ICSharpCode.Decompiler/Tests/PrettyTestRunner.cs
index e4790ae46..a82bd4faf 100644
--- a/ICSharpCode.Decompiler/Tests/PrettyTestRunner.cs
+++ b/ICSharpCode.Decompiler/Tests/PrettyTestRunner.cs
@@ -108,7 +108,13 @@ namespace ICSharpCode.Decompiler.Tests
 		{
 			Run(cscOptions: cscOptions);
 		}
-		
+
+		[Test, Ignore("Not implemented")]
+		public void LiftedOperators([ValueSource("defaultOptions")] CompilerOptions cscOptions)
+		{
+			Run(cscOptions: cscOptions);
+		}
+
 		[Test, Ignore("Bad variable names; some if-else misdetected")]
 		public void Loops([ValueSource("defaultOptions")] CompilerOptions cscOptions)
 		{
diff --git a/ICSharpCode.Decompiler/Tests/TestCases/Pretty/LiftedOperators.cs b/ICSharpCode.Decompiler/Tests/TestCases/Pretty/LiftedOperators.cs
new file mode 100644
index 000000000..e5dbc0884
--- /dev/null
+++ b/ICSharpCode.Decompiler/Tests/TestCases/Pretty/LiftedOperators.cs
@@ -0,0 +1,765 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
+{
+	public static class LiftedOperators
+	{
+		// C# uses 4 different patterns of IL for lifted operators: bool, other primitive types, decimal, other structs.
+		// Different patterns are used depending on whether both of the operands are nullable or only the left/right operand is nullable.
+		// Negation must not be pushed through such comparisons because it would change the semantics.
+		// A comparison used in a condition differs somewhat from a comparison used as a simple value.
+
+		public static void BoolBasic(bool? a, bool? b)
+		{
+			if (a == b) {
+				Console.WriteLine();
+			}
+			if (a != b) {
+				Console.WriteLine();
+			}
+
+			if (!(a == b)) {
+				Console.WriteLine();
+			}
+			if (!(a != b)) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void BoolComplex(bool? a, Func<bool> x)
+		{
+			if (a == x()) {
+				Console.WriteLine();
+			}
+			if (a != x()) {
+				Console.WriteLine();
+			}
+
+			if (x() == a) {
+				Console.WriteLine();
+			}
+			if (x() != a) {
+				Console.WriteLine();
+			}
+
+			if (!(a == x())) {
+				Console.WriteLine();
+			}
+			if (!(a != x())) {
+				Console.WriteLine();
+			}
+			if (!(x() == a)) {
+				Console.WriteLine();
+			}
+			if (!(x() != a)) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void BoolConst(bool? a)
+		{
+			if (a == true) {
+				Console.WriteLine();
+			}
+			if (a != true) {
+				Console.WriteLine();
+			}
+			if (a == false) {
+				Console.WriteLine();
+			}
+			if (a != false) {
+				Console.WriteLine();
+			}
+			if (a ?? true) {
+				Console.WriteLine();
+			}
+			if (a ?? false) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void BoolValueBasic(bool? a, bool? b)
+		{
+			Console.WriteLine(a == b);
+			Console.WriteLine(a != b);
+
+			Console.WriteLine(!(a == b));
+			Console.WriteLine(!(a != b));
+
+			Console.WriteLine(a & b);
+			Console.WriteLine(a | b);
+			Console.WriteLine(a ^ b);
+			Console.WriteLine(a ?? b);
+			Console.WriteLine(!a);
+			a &= b;
+			a |= b;
+			a ^= b;
+		}
+
+		public static void BoolValueComplex(bool? a, Func<bool> x)
+		{
+			Console.WriteLine(a == x());
+			Console.WriteLine(a != x());
+
+			Console.WriteLine(x() == a);
+			Console.WriteLine(x() != a);
+
+			Console.WriteLine(!(a == x()));
+			Console.WriteLine(!(a != x()));
+
+			Console.WriteLine(a & x());
+			Console.WriteLine(a | x());
+			Console.WriteLine(a ^ x());
+			Console.WriteLine(a ?? x());
+			a &= x();
+			a |= x();
+			a ^= x();
+
+			Console.WriteLine(x() ^ a);
+			(new bool?[0])[0] ^= x();
+		}
+
+		public static void BoolValueConst(bool? a)
+		{
+			Console.WriteLine(a == true);
+			Console.WriteLine(a != true);
+			Console.WriteLine(a == false);
+			Console.WriteLine(a != false);
+			Console.WriteLine(a ?? true);
+			Console.WriteLine(a ?? false);
+		}
+
+		public static void IntBasic(int? a, int? b)
+		{
+			if (a == b) {
+				Console.WriteLine();
+			}
+			if (a != b) {
+				Console.WriteLine();
+			}
+			if (a > b) {
+				Console.WriteLine();
+			}
+			if (a < b) {
+				Console.WriteLine();
+			}
+			if (a >= b) {
+				Console.WriteLine();
+			}
+			if (a <= b) {
+				Console.WriteLine();
+			}
+
+			if (!(a == b)) {
+				Console.WriteLine();
+			}
+			if (!(a != b)) {
+				Console.WriteLine();
+			}
+			if (!(a > b)) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void IntComplex(int? a, Func<int> x)
+		{
+			if (a == x()) {
+				Console.WriteLine();
+			}
+			if (a != x()) {
+				Console.WriteLine();
+			}
+			if (a > x()) {
+				Console.WriteLine();
+			}
+
+			if (x() == a) {
+				Console.WriteLine();
+			}
+			if (x() != a) {
+				Console.WriteLine();
+			}
+			if (x() > a) {
+				Console.WriteLine();
+			}
+
+			if (!(a == x())) {
+				Console.WriteLine();
+			}
+			if (!(a != x())) {
+				Console.WriteLine();
+			}
+			if (!(a > x())) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void IntConst(int? a)
+		{
+			if (a == 2) {
+				Console.WriteLine();
+			}
+			if (a != 2) {
+				Console.WriteLine();
+			}
+			if (a > 2) {
+				Console.WriteLine();
+			}
+
+			if (2 == a) {
+				Console.WriteLine();
+			}
+			if (2 != a) {
+				Console.WriteLine();
+			}
+			if (2 > a) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void IntValueBasic(int? a, int? b)
+		{
+			Console.WriteLine(a == b);
+			Console.WriteLine(a != b);
+			Console.WriteLine(a > b);
+
+			Console.WriteLine(!(a == b));
+			Console.WriteLine(!(a != b));
+			Console.WriteLine(!(a > b));
+
+			Console.WriteLine(a + b);
+			Console.WriteLine(a - b);
+			Console.WriteLine(a * b);
+			Console.WriteLine(a / b);
+			Console.WriteLine(a % b);
+			Console.WriteLine(a & b);
+			Console.WriteLine(a | b);
+			Console.WriteLine(a ^ b);
+			Console.WriteLine(a << b);
+			Console.WriteLine(a >> b);
+			Console.WriteLine(a ?? b);
+			Console.WriteLine(-a);
+			Console.WriteLine(~a);
+			// TODO:
+			//Console.WriteLine(a++);
+			//Console.WriteLine(a--);
+			Console.WriteLine(++a);
+			Console.WriteLine(--a);
+			a += b;
+			a -= b;
+			a *= b;
+			a /= b;
+			a %= b;
+			a &= b;
+			a |= b;
+			a ^= b;
+			a <<= b;
+			a >>= b;
+		}
+
+		public static void IntValueComplex(int? a, Func<int> x)
+		{
+			Console.WriteLine(a == x());
+			Console.WriteLine(a != x());
+			Console.WriteLine(a > x());
+
+			Console.WriteLine(x() == a);
+			Console.WriteLine(x() != a);
+			Console.WriteLine(x() > a);
+
+			Console.WriteLine(a + x());
+			Console.WriteLine(a - x());
+			Console.WriteLine(a * x());
+			Console.WriteLine(a / x());
+			Console.WriteLine(a % x());
+			Console.WriteLine(a & x());
+			Console.WriteLine(a | x());
+			Console.WriteLine(a ^ x());
+			Console.WriteLine(a << x());
+			Console.WriteLine(a >> x());
+			Console.WriteLine(a ?? x());
+			a += x();
+			a -= x();
+			a *= x();
+			a /= x();
+			a %= x();
+			a &= x();
+			a |= x();
+			a ^= x();
+			a <<= x();
+			a >>= x();
+
+			Console.WriteLine(x() + a);
+			(new int?[0])[0] += x();
+		}
+
+		public static void IntValueConst(int? a)
+		{
+			Console.WriteLine(a == 2);
+			Console.WriteLine(a != 2);
+			Console.WriteLine(a > 2);
+
+			Console.WriteLine(2 == a);
+			Console.WriteLine(2 != a);
+			Console.WriteLine(2 > a);
+
+			Console.WriteLine(a + 2);
+			Console.WriteLine(a - 2);
+			Console.WriteLine(a * 2);
+			Console.WriteLine(a / 2);
+			Console.WriteLine(a % 2);
+			Console.WriteLine(a & 2);
+			Console.WriteLine(a | 2);
+			Console.WriteLine(a ^ 2);
+			Console.WriteLine(a << 2);
+			Console.WriteLine(a >> 2);
+			Console.WriteLine(a ?? 2);
+			a += 2;
+			a -= 2;
+			a *= 2;
+			a /= 2;
+			a %= 2;
+			a &= 2;
+			a |= 2;
+			a ^= 2;
+			a <<= 2;
+			a >>= 2;
+
+			Console.WriteLine(2 + a);
+		}
+
+		public static void NumberBasic(decimal? a, decimal? b)
+		{
+			if (a == b) {
+				Console.WriteLine();
+			}
+			if (a != b) {
+				Console.WriteLine();
+			}
+			if (a > b) {
+				Console.WriteLine();
+			}
+			if (a < b) {
+				Console.WriteLine();
+			}
+			if (a >= b) {
+				Console.WriteLine();
+			}
+			if (a <= b) {
+				Console.WriteLine();
+			}
+
+			if (!(a == b)) {
+				Console.WriteLine();
+			}
+			if (!(a != b)) {
+				Console.WriteLine();
+			}
+			if (!(a > b)) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void NumberComplex(decimal? a, Func<decimal> x)
+		{
+			if (a == x()) {
+				Console.WriteLine();
+			}
+			if (a != x()) {
+				Console.WriteLine();
+			}
+			if (a > x()) {
+				Console.WriteLine();
+			}
+
+			if (x() == a) {
+				Console.WriteLine();
+			}
+			if (x() != a) {
+				Console.WriteLine();
+			}
+			if (x() > a) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void NumberConst(decimal? a)
+		{
+			if (a == 2m) {
+				Console.WriteLine();
+			}
+			if (a != 2m) {
+				Console.WriteLine();
+			}
+			if (a > 2m) {
+				Console.WriteLine();
+			}
+
+			if (2m == a) {
+				Console.WriteLine();
+			}
+			if (2m != a) {
+				Console.WriteLine();
+			}
+			if (2m > a) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void NumberValueBasic(decimal? a, decimal? b)
+		{
+			Console.WriteLine(a == b);
+			Console.WriteLine(a != b);
+			Console.WriteLine(a > b);
+
+			Console.WriteLine(!(a == b));
+			Console.WriteLine(!(a != b));
+			Console.WriteLine(!(a > b));
+
+			Console.WriteLine(a + b);
+			Console.WriteLine(a - b);
+			Console.WriteLine(a * b);
+			Console.WriteLine(a / b);
+			Console.WriteLine(a % b);
+			Console.WriteLine(a ?? b);
+			Console.WriteLine(-a);
+			// TODO:
+			//Console.WriteLine(a++);
+			//Console.WriteLine(a--);
+			//Console.WriteLine(++a);
+			//Console.WriteLine(--a);
+			a += b;
+			a -= b;
+			a *= b;
+			a /= b;
+			a %= b;
+		}
+
+		public static void NumberValueComplex(decimal? a, Func<decimal> x)
+		{
+			Console.WriteLine(a == x());
+			Console.WriteLine(a != x());
+			Console.WriteLine(a > x());
+
+			Console.WriteLine(x() == a);
+			Console.WriteLine(x() != a);
+			Console.WriteLine(x() > a);
+
+			Console.WriteLine(a + x());
+			Console.WriteLine(a - x());
+			Console.WriteLine(a * x());
+			Console.WriteLine(a / x());
+			Console.WriteLine(a % x());
+			Console.WriteLine(a ?? x());
+			a += x();
+			a -= x();
+			a *= x();
+			a /= x();
+			a %= x();
+
+			Console.WriteLine(x() + a);
+			(new decimal?[0])[0] += x();
+		}
+
+		public static void NumberValueConst(decimal? a)
+		{
+			Console.WriteLine(a == 2m);
+			Console.WriteLine(a != 2m);
+			Console.WriteLine(a > 2m);
+
+			Console.WriteLine(2m == a);
+			Console.WriteLine(2m != a);
+			Console.WriteLine(2m > a);
+
+			Console.WriteLine(a + 2m);
+			Console.WriteLine(a - 2m);
+			Console.WriteLine(a * 2m);
+			Console.WriteLine(a / 2m);
+			Console.WriteLine(a % 2m);
+			Console.WriteLine(a ?? 2m);
+			a += 2m;
+			a -= 2m;
+			a *= 2m;
+			a /= 2m;
+			a %= 2m;
+
+			Console.WriteLine(2m + a);
+		}
+
+		public static void CompareWithSignChange(int? a, int? b)
+		{
+			if ((uint?)a < (uint?)b) {
+				Console.WriteLine();
+			}
+			if ((uint?)a < 10UL) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void StructBasic(TS? a, TS? b)
+		{
+			if (a == b) {
+				Console.WriteLine();
+			}
+			if (a != b) {
+				Console.WriteLine();
+			}
+			if (a > b) {
+				Console.WriteLine();
+			}
+			if (a < b) {
+				Console.WriteLine();
+			}
+			if (a >= b) {
+				Console.WriteLine();
+			}
+			if (a <= b) {
+				Console.WriteLine();
+			}
+
+			if (!(a == b)) {
+				Console.WriteLine();
+			}
+			if (!(a != b)) {
+				Console.WriteLine();
+			}
+			if (!(a > b)) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void StructComplex(TS? a, Func<TS> x)
+		{
+			if (a == x()) {
+				Console.WriteLine();
+			}
+			if (a != x()) {
+				Console.WriteLine();
+			}
+			if (a > x()) {
+				Console.WriteLine();
+			}
+
+			if (x() == a) {
+				Console.WriteLine();
+			}
+			if (x() != a) {
+				Console.WriteLine();
+			}
+			if (x() > a) {
+				Console.WriteLine();
+			}
+		}
+
+		public static void StructValueBasic(TS? a, TS? b, int? i)
+		{
+			Console.WriteLine(a == b);
+			Console.WriteLine(a != b);
+			Console.WriteLine(a > b);
+
+			Console.WriteLine(!(a == b));
+			Console.WriteLine(!(a != b));
+			Console.WriteLine(!(a > b));
+
+			Console.WriteLine(a + b);
+			Console.WriteLine(a - b);
+			Console.WriteLine(a * b);
+			Console.WriteLine(a / b);
+			Console.WriteLine(a % b);
+			Console.WriteLine(a & b);
+			Console.WriteLine(a | b);
+			Console.WriteLine(a ^ b);
+			Console.WriteLine(a << i);
+			Console.WriteLine(a >> i);
+			Console.WriteLine(a ?? b);
+			Console.WriteLine(+a);
+			Console.WriteLine(-a);
+			Console.WriteLine(!a);
+			Console.WriteLine(~a);
+			// TODO:
+			//Console.WriteLine(a++);
+			//Console.WriteLine(a--);
+			//Console.WriteLine(++a);
+			//Console.WriteLine(--a);
+			//Console.WriteLine((int?)a);
+			a += b;
+			a -= b;
+			a *= b;
+			a /= b;
+			a %= b;
+			a &= b;
+			a |= b;
+			a ^= b;
+			a <<= i;
+			a >>= i;
+		}
+
+		public static void StructValueComplex(TS? a, Func<TS> x, Func<int> i)
+		{
+			Console.WriteLine(a == x());
+			Console.WriteLine(a != x());
+			Console.WriteLine(a > x());
+
+			Console.WriteLine(x() == a);
+			Console.WriteLine(x() != a);
+			Console.WriteLine(x() > a);
+
+			Console.WriteLine(a + x());
+			Console.WriteLine(a - x());
+			Console.WriteLine(a * x());
+			Console.WriteLine(a / x());
+			Console.WriteLine(a % x());
+			Console.WriteLine(a & x());
+			Console.WriteLine(a | x());
+			Console.WriteLine(a ^ x());
+			Console.WriteLine(a << i());
+			Console.WriteLine(a >> i());
+			Console.WriteLine(a ?? x());
+			a += x();
+			a -= x();
+			a *= x();
+			a /= x();
+			a %= x();
+			a &= x();
+			a |= x();
+			a ^= x();
+			a <<= i();
+			a >>= i();
+
+			Console.WriteLine(x() + a);
+			(new TS?[0])[0] += x();
+		}
+	}
+
+	// dummy structure for testing custom operators
+	[StructLayout(LayoutKind.Sequential, Size = 1)]
+	public struct TS
+	{
+		// unary
+		public static TS operator +(TS a)
+		{
+			throw null;
+		}
+		public static TS operator -(TS a)
+		{
+			throw null;
+		}
+		public static TS operator !(TS a)
+		{
+			throw null;
+		}
+		public static TS operator ~(TS a)
+		{
+			throw null;
+		}
+		public static TS operator ++(TS a)
+		{
+			throw null;
+		}
+		public static TS operator --(TS a)
+		{
+			throw null;
+		}
+
+		public static explicit operator int(TS a)
+		{
+			throw null;
+		}
+
+		// binary
+		public static TS operator +(TS a, TS b)
+		{
+			throw null;
+		}
+		public static TS operator -(TS a, TS b)
+		{
+			throw null;
+		}
+		public static TS operator *(TS a, TS b)
+		{
+			throw null;
+		}
+		public static TS operator /(TS a, TS b)
+		{
+			throw null;
+		}
+		public static TS operator %(TS a, TS b)
+		{
+			throw null;
+		}
+		public static TS operator &(TS a, TS b)
+		{
+			throw null;
+		}
+		public static TS operator |(TS a, TS b)
+		{
+			throw null;
+		}
+		public static TS operator ^(TS a, TS b)
+		{
+			throw null;
+		}
+		public static TS operator <<(TS a, int b)
+		{
+			throw null;
+		}
+		public static TS operator >>(TS a, int b)
+		{
+			throw null;
+		}
+
+		// comparisons
+		public static bool operator ==(TS a, TS b)
+		{
+			throw null;
+		}
+		public static bool operator !=(TS a, TS b)
+		{
+			throw null;
+		}
+		public static bool operator <(TS a, TS b)
+		{
+			throw null;
+		}
+		public static bool operator <=(TS a, TS b)
+		{
+			throw null;
+		}
+		public static bool operator >(TS a, TS b)
+		{
+			throw null;
+		}
+		public static bool operator >=(TS a, TS b)
+		{
+			throw null;
+		}
+
+		public override bool Equals(object obj)
+		{
+			throw null;
+		}
+		public override int GetHashCode()
+		{
+			throw null;
+		}
+	}
+}