According to the specs

[link:research.microsoft.com] "14.1.8 Exceptions to when tokens are offside"

"When in a SeqBlock context, an infix token may be offside by the size of the token plus one."

This should be allowed

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let fn () =
        2
    ||| 3

but it seems that in the current implementation the beginning of the infix token can only be offside by
3 spaces or less like this

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let fn () =


        2
     ||| 3

and even like this

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let fn () =


        2


     + 3