syntax - F#: always "unexpected 'when' keyword" -

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The VS2010 beta 2f # compiler always complains about the use of keywords by me, even when copy -Pip code is also used to work, for example, for example, I get this error when trying to execute a very trivial expression:

"Error FS0010 : Unexpected keyword 'when' in expression. Expected '-' 'or other token. " 

  For i [1..50 in i & lt; 10 - & gt; I] --------------- ^^^^

You want 

  for [i in 1..50 if i

The 'short' syntax was deleted with 'short time'.

See "Compact Sequence Expression" in that document.


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