diff --git a/mcs/errors/CS0103-2-lib.cs b/mcs/errors/CS0103-2-lib.cs
new file mode 100644
index 000000000000..beeec82e8201
--- /dev/null
+++ b/mcs/errors/CS0103-2-lib.cs
@@ -0,0 +1,4 @@
+public class C
+{
+	int i;
+}
diff --git a/mcs/errors/Makefile b/mcs/errors/Makefile
index 33b20aaf52b5..b35ee874367a 100644
--- a/mcs/errors/Makefile
+++ b/mcs/errors/Makefile
@@ -22,7 +22,7 @@ DISTFILES = \
 	$(wildcard known-issues-*)
 
 TEST_SUPPORT_FILES = \
-	CS0118-2-lib.dll CS0122-10-lib.dll CS0122-14-lib.dll CS0122-15-lib.dll CS0122-19-lib.dll CS0144-3-lib.dll \
+	CS0103-2-lib.dll CS0118-2-lib.dll CS0122-10-lib.dll CS0122-14-lib.dll CS0122-15-lib.dll CS0122-19-lib.dll CS0144-3-lib.dll \
 	CS0205-3-lib.dll \
 	CS0229-3-lib.dll CS0229-4-lib.dll \
 	CS0433-lib.dll CS0433-2-lib.dll \
diff --git a/mcs/errors/cs0103-2.cs b/mcs/errors/cs0103-2.cs
new file mode 100644
index 000000000000..3ed7e3586c30
--- /dev/null
+++ b/mcs/errors/cs0103-2.cs
@@ -0,0 +1,11 @@
+// CS0103: The name `i' does not exist in the current context
+// Line: 9
+// Compiler options: -r:CS0103-2-lib.dll
+
+class A : C
+{
+	void Test ()
+	{
+		i = 0;
+	}
+}
diff --git a/mcs/errors/cs0426-2.cs b/mcs/errors/cs0426-2.cs
new file mode 100644
index 000000000000..2d7d66a92e4e
--- /dev/null
+++ b/mcs/errors/cs0426-2.cs
@@ -0,0 +1,14 @@
+// CS0426: The nested type `M' does not exist in the type `N'
+// Line: 6
+
+class A
+{
+	class B : N.M
+	{
+	}
+}
+
+class N
+{
+	public const string S = "1";
+}
diff --git a/mcs/errors/gcs0508.cs b/mcs/errors/gcs0508.cs
new file mode 100644
index 000000000000..9a1552971f6e
--- /dev/null
+++ b/mcs/errors/gcs0508.cs
@@ -0,0 +1,15 @@
+// CS0508: `A<T>.B.getT()': return type must be `A<T>.B' to match overridden member `A<A<T>.B>.getT()'
+// Line: 10
+
+abstract class A<T>
+{
+	public abstract T getT ();
+
+	public class B : A<B>
+	{
+		public override B getT ()
+		{
+			return default (B);
+		}
+	}
+}
diff --git a/mcs/errors/gcs0854-2.cs b/mcs/errors/gcs0854-2.cs
new file mode 100644
index 000000000000..0be64747e53c
--- /dev/null
+++ b/mcs/errors/gcs0854-2.cs
@@ -0,0 +1,17 @@
+// CS0854: An expression tree cannot contain an invocation which uses optional parameter
+// Line: 15
+
+using System;
+using System.Linq.Expressions;
+
+class M
+{
+	public M (string s = "value")
+	{
+	}
+	
+	public static void Main ()
+	{
+		Expression<Action> e = () => new M ();
+	}
+}