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    <p>it seems that when you use "let .. in" you can override the default "#light" setting which is that whitespace is significant, so I guess that's what happens in this case and why you don't get any warning/error in the second case (you added 'in', so the compiler thinks that you want to specify the scope explicitly). It seems a bit weird so it may be a bug. I'm sure Brian from the F# team will answer this doubt soon :-).</p> <p>Anyway, I think the compiler treats your second example just as (using an easier to compile example):</p> <pre><code>open System let ar = new ResizeArray&lt;_&gt;() in let rnd = new Random(); ar.Add(rnd.Next()) printfn "%A" (rnd.Next()) </code></pre> <p>You can force it to treat it as you wanted if you add parentheses and write something like this:</p> <pre><code>let ar = new ResizeArray&lt;_&gt;() in (let rnd = new Random() ar.Add(rnd.Next())) printfn "%A" (rnd.Next()) </code></pre> <p>In general, you can use parentheses to specify scopes in any place of the F# program. For example you can write:</p> <pre><code>let a = 1 (let a = a + 10 printfn "%d" a) printfn "%d" a </code></pre> <p>This example prints "10" and then "1". Of course, this doesn't seem to be very practical, but it is useful when using the <code>use</code> keyword that behaves like <code>let</code>, but works for <code>IDisposable</code> objects and ensures that the object is disposed when it leaves the scope (this is just like <code>using</code> in C#):</p> <pre><code>let some = new Some() (use file = new StreamReader(...) let txt = file.ReadToEnd() printfn "%s" txt) doSomething() // continue, 'file' is now closed! </code></pre> <p><strong>EDIT</strong>: I completely forgot to mention the important bit - the first way of writing the code seems more natural to me (and it fully uses the benefits of "simple" #light syntax that F# offers), so I would prefer it :-). </p>
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