I have a piece of code:

links
    |> Seq.map (fun x -> x.GetAttributeValue ("href", "no url"))

Which I wanted to rewrite to:

links
    |> Seq.map (fun x -> (x.GetAttributeValue "href" "no url"))

But the F# compiler doesn't seem to like that. I was under the impression that these two function calls were interchangeable:

f (a, b)
(f a b)

The error that I get is:

The member or object constructor 'GetAttributeValue' taking 2 arguments are not accessible from this code location. All accessible versions of method 'GetAttributeValue' take 2 arguments.

Which seems amusing, as it seems to indicate that it needs what I'm giving it. What am I missing here?