Missing space before arrow

[nojaf]

Issue created from fantomas-online

Code

        match subcategory with
        | BuildPhaseSubcategory.Compile
        | BuildPhaseSubcategory.Parameter
        | BuildPhaseSubcategory.Parse
        | BuildPhaseSubcategory.TypeCheck -> true
        | BuildPhaseSubcategory.DefaultPhase
        | BuildPhaseSubcategory.CodeGen
        | BuildPhaseSubcategory.Optimize
        | BuildPhaseSubcategory.IlxGen
        | BuildPhaseSubcategory.IlGen
        | BuildPhaseSubcategory.Output
        | BuildPhaseSubcategory.Interactive -> false
        | BuildPhaseSubcategory.Internal
        // Getting here means the compiler has ICE-d. Let's not pile on by showing the unknownSubcategory assert below.
        // Just treat as an unknown-to-LanguageService error.
         -> false
        | unknownSubcategory ->
            Debug.Assert(false, sprintf "Subcategory '%s' could not be correlated with a build phase." unknownSubcategory)
            // Recovery is to treat this as a 'build' error. Downstream, the project system and language service will treat this as
            // if it came from the build and not the language service.
            false

Result

match subcategory with
| BuildPhaseSubcategory.Compile
| BuildPhaseSubcategory.Parameter
| BuildPhaseSubcategory.Parse
| BuildPhaseSubcategory.TypeCheck -> true
| BuildPhaseSubcategory.DefaultPhase
| BuildPhaseSubcategory.CodeGen
| BuildPhaseSubcategory.Optimize
| BuildPhaseSubcategory.IlxGen
| BuildPhaseSubcategory.IlGen
| BuildPhaseSubcategory.Output
| BuildPhaseSubcategory.Interactive -> false
| BuildPhaseSubcategory.Internal
// Getting here means the compiler has ICE-d. Let's not pile on by showing the unknownSubcategory assert below.
// Just treat as an unknown-to-LanguageService error.
-> false
| unknownSubcategory ->
    Debug.Assert(false, sprintf "Subcategory '%s' could not be correlated with a build phase." unknownSubcategory)
    // Recovery is to treat this as a 'build' error. Downstream, the project system and language service will treat this as
    // if it came from the build and not the language service.
    false

Problem description

There should be at least a single space before -> false, it currently leads to invalid code.

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 2023-05-30T07:57:23Z - a6cf0bb

Default Fantomas configuration

_{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.}