Weird break after Some instead of binary operator

[cmeeren]

Issue created from fantomas-online

Code

let foo = xs |> List.filter (fun x -> x.FooBar = Some y)

Result

let foo =
    xs
    |> List.filter
        (fun x ->
            x.FooBar = Some
                y)

Problem description

Breaking at Some instead of = seems to be breaking at an incorrect semantic level.

Compare with the result if replacing = with <>, which makes more sense:

let foo =
    xs
    |> List.filter
        (fun x ->
            x.FooBar
            <> Some y)

Note that the example uses an artificially low max line length to reproduce with simple code. In real code, I have a max length of 120 and (in this case) some long names in nested modules/functions/expressions.

Extra information

• The formatted result breaks my code.
• The formatted result gives compiler warnings.
• I or my company would be willing to help fix this.
• I would like a release if this problem is solved.

Options

Fantomas main branch at 1/1/1990

    { config with
                MaxLineLength = 25 }

_{Did you know that you can ignore files when formatting by using a .fantomasignore file?
PS: It's unlikely that someone else will solve your specific issue, as it's something that you have a personal stake in.}