Weird Error Message During CLR SQL UDF In VS2005

I'm trying out the nifty new way of writing SPROCs and UDFs in CLR (C#).  I have a UDF that is a bit too complicated for T-SQL so I wrote it in C# but now I can't deploy it.

I run the build and it compiles fine.  Then I get this error when VS2005 tries to 'deploy':

------ Deploy started: Project: Kingsmere.SQL, Configuration: Debug Any CPU ------

Deploying file: Kingsmere.SQL.dll, Path: C:Documents and SettingsEmmanuelMy DocumentsVisual Studio 2005ProjectsKingsmere.SQLobjDebugKingsmere.SQL.dll ...

Error: Incorrect syntax near '&'.

I don't have a single ampersand character in my UDF's .cs file.  The Test.sql file doesn't have one either.  There is no file, line, column number associated with the error.  If I hit F1, I get help for compile time error CS0266 which is for no implicit cast available (which was the last compile error I got before compiling successfully so I think this is a red herring.  In other words, online help is just displaying the last know error number - nothing to do with the deployment error).

I've noticed that if I change the signature of the function from:

[Microsoft.SqlServer.Server.SqlFunction] public static int ComputeGoalNodeSpread(SqlInt64 Commence, SqlInt64 Finish, SqlByte TreeLevel, out SqlInt64 PreOrder, out SqlInt64 PostOrder)

to: [Microsoft.SqlServer.Server.SqlFunction] public static int ComputeGoalNodeSpread(SqlInt64 Commence, SqlInt64 Finish, SqlByte TreeLevel)

The error goes away.  Seems to be related to those By Reference parameters.

Help!