Multiline string inside lambda expression fails to format

[shivinsky]

Issue created from fantomas-online

Code

let _ =
    [] |> List.map (fun _ -> @"a
b"     )
       |> List.length

Error

Fantomas was able to format the code but the result appears to be invalid F# code.
Please open an issue.

Formatted result:

let _ =
    []
    |> List.map
        (fun _ ->
            @"a
b")
    |> List.length

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 12/17/2020 16:49:57 - a212bf0

Default Fantomas configuration

[nojaf]

Hello, thanks for this report. I still don't really know how to solve this but I wanted to let you know that the problem does not seems to occur when fsharp_multi_line_lambda_closing_newline=true.
Sample.

[nojaf]

Fix available in v5.2.0-beta-001