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Compiler Error CS2005

Missing file specification for 'option' option

A compiler option was only partially specified.

For example, when using /recurse, you must specify the file to search: /recurse:filename.cs.

Example

The following sample generates CS2005.

// CS2005.cs
// compile with: /recurse:
// CS2005 expected
class x
{
   public static void Main() {}
}