| test.cs, attached below, compiles cleanly with csc (csc | /target:library | test.cs) | but fails with mcs (mcs --target library -r System test.cs) | Great bug report! However, this kind of report would be better placed in bugzilla. You can find it at: http://bugzilla.ximian.com/ Note: you will have to use the "sophisticated" interface to report mono bugs. Nick D.