Backward operator with lambda

[lucasteles]

There is some cases that looks more natural to keep the lambda argument definition at the same level of backpipe operator

testCase "foo" <| fun _ ->
    let subject = true
    Expect.isTrue subject "I compute, therefore I am."

Today I think that the accepted way would be only:

testCase "foo"
<| fun _ ->
  let subject = true
  Expect.isTrue subject "I compute, therefore I am."

This form gives a more "function body" look to some expressions, which plays well with this kind of definitions (eg. Expecto)