-26 Corlib compilation is not supported in MS.NET
+-27 Attribute resolved to two different types
+
----------
Errors that we have allocated that will have corresponding errors in
-204 yield statement in something which is not a method-body,
accessor-body or operator-body
+
+-205 A method containing a yield statement is not IEnumerator.
+
+-206 Return statement not allowed inside iterators.
+
+-207 A parameter in an enumerator method contains out or ref
+
+-208 Yield statement appears inside finally clause
+
+-209 Yield statment appears in anonymous method.
+
+-210 Fixed code not allowed inside iterators.
+
+-211 Array expression passed to attribute is not unidimensional
+
+-212 An Array creation expression is present, but the array is not
+ initialized.
+
+-213 This feature requires v2 support.
+
+-214 Generic class can not have attribute as its parent class
+
+-215 Taking the address of a parameter in an iterator is not allowed.
+
+-216 Can not use a type parameters as base class
+
+-217 Wrong number of type parameters
+
+-218 Invalid constraints clause
+
+-219 Type argument doesn't meet constraints.
+
+-220 Cannot resolve constructed type
+
+-221 params modifier present in anonymous method declaration
+
+-222 yield statement only available in C# 2.0 mode