Long line causes offside error

[Smaug123]

Issue created from fantomas-online

Code

let c =
    if bar |> Seq.exists ((|KeyValue|) >> snd >> (=) (Some i)) then false else true

Result

let c =
    if bar
       |> Seq.exists (
           (|KeyValue|)
           >> snd
           >> (=) (Some i)
       ) then
        false
    else
        true

Problem description

For unclear reasons, this is an offside error on the (|KeyValue|) line. The problem is that the whole thing is happening inside the if check, and the offside rules are somehow weird there.

I think the right answer is to modify F# to allow this. However, if we have to stick around with the existing rules, then I think the following is the best of a bad bunch:

let c =
    if
        bar
        |> Seq.exists
            (
                (|KeyValue|)
                >> snd
                >> (=) (Some i)
            )
    then
        false
    else
        true

Extra information

• The formatted result breaks by code.
• The formatted result gives compiler warnings.
• I or my company would be willing to help fix this.

Options

Fantomas Master at 01/27/2021 07:36:19 - 138146e

Default Fantomas configuration

_{Did you know that you can ignore files when formatting from fantomas-tool or the FAKE targets by using a .fantomasignore file?}

[nojaf]

This is another example of dotnet/fsharp#10852 I believe.