Long line breaks match

[Smaug123]

Issue created from fantomas-online

Code

let foo () =
    match b.TryGetValue (longlonglonglonglong, b) with
    | true, i -> Some i
    | false, _ -> failwith ""

Result

let foo () =
    match b.TryGetValue (
              longlonglonglonglong,
              b
          ) with
    | true, i -> Some i
    | false, _ -> failwith ""

Problem description

This is very likely related to #1402.

The long line split has broken an offside rule in the match statement on the long variable name. I think if necessary, the answer if we can't fix F# might be:

let foo () =
    match
        b.TryGetValue
            (
                  longlonglonglonglong,
                  b
            )
        with
    | true, i -> Some i
    | false, _ -> failwith ""

i.e. one level of indentation on the bracket.

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

    { config with
                MaxLineLength = 40
                SpaceBeforeUppercaseInvocation = true }

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

[nojaf]

Does this really break the code or just produce a warning?
The following code produces a warning for example.

open System
let b ="True"
let foo () =
    match Boolean.TryParse (
            b
          ) with
    | true, i -> Some i
    | false, _ -> failwith ""
foo()

[nojaf]

Related compiler issue: dotnet/fsharp#10929

[Smaug123]

If you have warnings-as-errors for FS0058 turned on, then presumably it breaks the code ;)