diff --git a/src/tests/Loader/classloader/generics/Variance/IL/CastClass001.cs b/src/tests/Loader/classloader/generics/Variance/IL/CastClass001.cs
index d6325651435f52..0b1d91a7f5b8b3 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/CastClass001.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/CastClass001.cs
@@ -7,14 +7,14 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> { }
-public class GSubT<T> : GBase<T> { }
-
-public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
-public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
-public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> {}
-public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> {}
-public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> {}
+public class GBase<T> { public GBase() { } }
+public class GSubT<T> : GBase<T> { public GSubT() { } }
+
+public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> { public GTU() {} }
+public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> { public GTArrUArr() {} }
+public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> { public GRefTRefU() {} }
+public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> { public GRefTArrRefUArr() {} }
+public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> { public GArrRefTArrRefU() {} }
 
 
 public class TestClass
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/CastClass004.cs b/src/tests/Loader/classloader/generics/Variance/IL/CastClass004.cs
index 33ce3f1f53b2ac..f7771b725df301 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/CastClass004.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/CastClass004.cs
@@ -7,8 +7,8 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
 public struct GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
 public struct GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/IsInst001.cs b/src/tests/Loader/classloader/generics/Variance/IL/IsInst001.cs
index 750ffc6bdc5146..ebb3e971dd858f 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/IsInst001.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/IsInst001.cs
@@ -7,14 +7,14 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
-public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
-public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
-public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> {}
-public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> {}
-public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> {}
+public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> { public GTU() {} }
+public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> { public GTArrUArr() {} }
+public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> { public GRefTRefU() {} }
+public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> { public GRefTArrRefUArr() {} }
+public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> { public GArrRefTArrRefU() {} }
 
 public class TestClass
 {
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/IsInst002.cs b/src/tests/Loader/classloader/generics/Variance/IL/IsInst002.cs
index 9dfe732f4cdb8a..a47ecb06d96c5d 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/IsInst002.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/IsInst002.cs
@@ -7,14 +7,14 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
-public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IMinusTPlusU<T,U> {}
-public class GTArrUArr<T,U> : IMinusT<T[]>, IPlusT<U[]>, IMinusTPlusU<T[],U[]> {}
-public class GRefTRefU<T,U> : IMinusT<IPlusT<T>>, IMinusT<IMinusT<U>>, IMinusTPlusU<IPlusT<T>, IPlusT<U>> {}
-public class GRefTArrRefUArr<T,U> : IMinusT<IPlusT<T[]>>, IMinusT<IMinusT<U[]>>, IMinusTPlusU<IPlusT<T[]>,IPlusT<U[]>> {}
-public class GArrRefTArrRefU<T,U> : IMinusT<IPlusT<T>[]>, IMinusT<IMinusT<U>[]>, IMinusTPlusU<IPlusT<T>[],IPlusT<U>[]> {}
+public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IMinusTPlusU<T,U> { public GTU() {} }
+public class GTArrUArr<T,U> : IMinusT<T[]>, IPlusT<U[]>, IMinusTPlusU<T[],U[]> { public GTArrUArr() {} }
+public class GRefTRefU<T,U> : IMinusT<IPlusT<T>>, IMinusT<IMinusT<U>>, IMinusTPlusU<IPlusT<T>, IPlusT<U>> { public GRefTRefU() {} }
+public class GRefTArrRefUArr<T,U> : IMinusT<IPlusT<T[]>>, IMinusT<IMinusT<U[]>>, IMinusTPlusU<IPlusT<T[]>,IPlusT<U[]>> { public GRefTArrRefUArr() {} }
+public class GArrRefTArrRefU<T,U> : IMinusT<IPlusT<T>[]>, IMinusT<IMinusT<U>[]>, IMinusTPlusU<IPlusT<T>[],IPlusT<U>[]> { public GArrRefTArrRefU() {} }
 
 public class TestClass
 {
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/IsInst003.cs b/src/tests/Loader/classloader/generics/Variance/IL/IsInst003.cs
index ce06d28134cf19..08a54b7b007406 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/IsInst003.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/IsInst003.cs
@@ -7,14 +7,14 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
-	
-public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
-public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
-public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> {}
-public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> {}
-public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
+
+public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> { public GTU() {} }
+public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> { public GTArrUArr() {} }
+public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> { public GRefTRefU() {} }
+public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> { public GRefTArrRefUArr() {} }
+public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> { public GArrRefTArrRefU() {} }
 
 public class TestClass
 {
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/IsInst004.cs b/src/tests/Loader/classloader/generics/Variance/IL/IsInst004.cs
index 6c5fa9c09331e8..218be8f846b94e 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/IsInst004.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/IsInst004.cs
@@ -7,8 +7,8 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
 public struct GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
 public struct GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/IsInst005.cs b/src/tests/Loader/classloader/generics/Variance/IL/IsInst005.cs
index 9b9373d10af844..309252d762655a 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/IsInst005.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/IsInst005.cs
@@ -7,8 +7,8 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
 public struct GTU<T,U> : IPlusT<T>, IMinusT<U>, IMinusTPlusU<T,U> {}
 public struct GTArrUArr<T,U> : IMinusT<T[]>, IPlusT<U[]>, IMinusTPlusU<T[],U[]> {}
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/IsInst006.cs b/src/tests/Loader/classloader/generics/Variance/IL/IsInst006.cs
index f49beb692ed58c..97af79e8e4432a 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/IsInst006.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/IsInst006.cs
@@ -7,8 +7,8 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
 public struct GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
 public struct GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/Unbox001.cs b/src/tests/Loader/classloader/generics/Variance/IL/Unbox001.cs
index 7ae7877f1c0a5e..9fdf7f6a77fd11 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/Unbox001.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/Unbox001.cs
@@ -7,14 +7,14 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
-public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
-public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
-public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> {}
-public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> {}
-public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> {}
+public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> { public GTU() {} }
+public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> { public GTArrUArr() {} }
+public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> { public GRefTRefU() {} }
+public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> { public GRefTArrRefUArr() {} }
+public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> { public GArrRefTArrRefU() {} }
 
 public class TestClass
 {
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/Unbox002.cs b/src/tests/Loader/classloader/generics/Variance/IL/Unbox002.cs
index e68bf719a243ef..de3539f85de67b 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/Unbox002.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/Unbox002.cs
@@ -7,14 +7,14 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
-public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IMinusTPlusU<T,U> {}
-public class GTArrUArr<T,U> : IMinusT<T[]>, IPlusT<U[]>, IMinusTPlusU<T[],U[]> {}
-public class GRefTRefU<T,U> : IMinusT<IPlusT<T>>, IMinusT<IMinusT<U>>, IMinusTPlusU<IPlusT<T>, IPlusT<U>> {}
-public class GRefTArrRefUArr<T,U> : IMinusT<IPlusT<T[]>>, IMinusT<IMinusT<U[]>>, IMinusTPlusU<IPlusT<T[]>,IPlusT<U[]>> {}
-public class GArrRefTArrRefU<T,U> : IMinusT<IPlusT<T>[]>, IMinusT<IMinusT<U>[]>, IMinusTPlusU<IPlusT<T>[],IPlusT<U>[]> {}
+public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IMinusTPlusU<T,U> { public GTU() {} }
+public class GTArrUArr<T,U> : IMinusT<T[]>, IPlusT<U[]>, IMinusTPlusU<T[],U[]> { public GTArrUArr() {} }
+public class GRefTRefU<T,U> : IMinusT<IPlusT<T>>, IMinusT<IMinusT<U>>, IMinusTPlusU<IPlusT<T>, IPlusT<U>> { public GRefTRefU() {} }
+public class GRefTArrRefUArr<T,U> : IMinusT<IPlusT<T[]>>, IMinusT<IMinusT<U[]>>, IMinusTPlusU<IPlusT<T[]>,IPlusT<U[]>> { public GRefTArrRefUArr() {} }
+public class GArrRefTArrRefU<T,U> : IMinusT<IPlusT<T>[]>, IMinusT<IMinusT<U>[]>, IMinusTPlusU<IPlusT<T>[],IPlusT<U>[]> { public GArrRefTArrRefU() {} }
 
 public class TestClass
 {
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/Unbox003.cs b/src/tests/Loader/classloader/generics/Variance/IL/Unbox003.cs
index d8ad357fba2fb6..c26fb0313c5960 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/Unbox003.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/Unbox003.cs
@@ -7,14 +7,14 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
-
-public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
-public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
-public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> {}
-public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> {}
-public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
+
+public class GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> { public GTU() {} }
+public class GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> { public GTArrUArr() {} }
+public class GRefTRefU<T,U> : IPlusT<IPlusT<T>>, IPlusT<IMinusT<U>>, IPlusTMinusU<IPlusT<T>, IPlusT<U>> { public GRefTRefU() {} }
+public class GRefTArrRefUArr<T,U> : IPlusT<IPlusT<T[]>>, IPlusT<IMinusT<U[]>>, IPlusTMinusU<IPlusT<T[]>,IPlusT<U[]>> { public GRefTArrRefUArr() {} }
+public class GArrRefTArrRefU<T,U> : IPlusT<IPlusT<T>[]>, IPlusT<IMinusT<U>[]>, IPlusTMinusU<IPlusT<T>[],IPlusT<U>[]> { public GArrRefTArrRefU() {} }
 
 public class TestClass
 {
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/Unbox004.cs b/src/tests/Loader/classloader/generics/Variance/IL/Unbox004.cs
index 8f4380e2ecb841..7228e5ed686fb4 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/Unbox004.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/Unbox004.cs
@@ -7,8 +7,8 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
 public struct GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
 public struct GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/Unbox005.cs b/src/tests/Loader/classloader/generics/Variance/IL/Unbox005.cs
index 7ad21e670f8b52..93c0d1286e58ca 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/Unbox005.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/Unbox005.cs
@@ -7,8 +7,8 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
 public struct GTU<T,U> : IPlusT<T>, IMinusT<U>, IMinusTPlusU<T,U> {}
 public struct GTArrUArr<T,U> : IMinusT<T[]>, IPlusT<U[]>, IMinusTPlusU<T[],U[]> {}
diff --git a/src/tests/Loader/classloader/generics/Variance/IL/Unbox006.cs b/src/tests/Loader/classloader/generics/Variance/IL/Unbox006.cs
index 065cace35db12d..4f47e061af1909 100644
--- a/src/tests/Loader/classloader/generics/Variance/IL/Unbox006.cs
+++ b/src/tests/Loader/classloader/generics/Variance/IL/Unbox006.cs
@@ -7,8 +7,8 @@
 public class Base {}
 public class Sub : Base {}
 
-public class GBase<T> {}
-public class GSubT<T> : GBase<T> {}
+public class GBase<T> { public GBase() {} }
+public class GSubT<T> : GBase<T> { public GSubT() {} }
 	
 public struct GTU<T,U> : IPlusT<T>, IMinusT<U>, IPlusTMinusU<T,U> {}
 public struct GTArrUArr<T,U> : IPlusT<T[]>, IMinusT<U[]>, IPlusTMinusU<T[],U[]> {}