F# does not support variance annotations (and ignores them in interop code) - see notes in the spec, 14.5:
(One could imagine that a future version of F# might support them, but I think uses come up rarely even in C#, and ever more rarely in F# (since there are often fewer type hierarchies and subtyping relationships in F# code).)
I disagree. This does come up a lot in C# code when dealing with IEnumerable<T>, and it does come a lot in F# code when dealing with the same thing (even more so, as, thanks to seq generator expressions, sequences are more prolific in F#).
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Hi,Just wondering if anyone knows how F# will deal with variance once Visual Studio 2010 (and .NET4.0) is released. Will variance annotations like in C#/VB be possible? If not, will F# support using interfaces in a co or contra-variant way if they are exposed from another language? And so on.It seems this feature fits right into F#'s language vision (see other type safety features like units of measure and comparison/equality constraints), but I can't find anything about it. Am I missing something here?cheers,Kurt