+-17 A type has already been defined (try --nostdlib)
+
+-18 Do not know how to generate debugging information for this platform.
+
+-19 Can not find required utility function in the core libraries.
+
+-20 Cannot find attribute type Blah (maybe you forgot to set the
+ usage using the AttributeUsage attribute ?).
+
+-21 Bug in Microsoft compiler while applying named attribute for
+ StructLayout.CharSet value.
+
+-22 Location of previous error
+
+-23 .NET runtime error when encoding attributes whose constructor
+ takes an object, but an enumeration value that is boxed is
+ passed.
+
+ Sample:
+ using System.ComponentModel;
+ [DefaultValue (CollectionChangeAction.Add)]
+ class X { static void Main () { } }
+
+
+-24 .NET runtime bug when trying to set custom attributes on the
+ return type of a method
+
+
+-25 Generic parse error
+
+-26 Corlib compilation is not supported in MS.NET
+
+-27 Attribute resolved to two different types
+
+-28 (retired)
+
+-29 Use -option instead of --option: to move people to the new
+ command line handling.
+
+-30 This version of the runtime does not support making pinned local variables.
+ This code may cause errors on a runtime with a moving GC
+
+-31 Internal compiler error during the method emit phase.
+
+-32 Internal compiler error during parsing.
+
+-33 Contravariant type parameters cannot be the return type.
+
+-34 Contravariant type parameters can only be used as type arguments in
+ contravariant positions.
+
+-35 Covariant type parameters can only be used as type arguments in
+ covariant positions.
+
+-36 Variant type parameters can only be used with interface and
+ delegate types.
+
+-37 Contravariant type parameters cannot be byref method parameters.
+
+-38 Covariant type parameters cannot be used as method parameters.
+
+----------
+
+Errors that we have allocated that will have corresponding errors in
+the Microsoft C# compiler:
+
+-200 Constraints for class defined, but there is no parameter list.
+
+-201 Class containing main method is generic.
+
+-202 Can not use a type parameter in an attribute.
+
+-203 Can not use type parameters as unmanaged types.
+
+-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