Brace on its own line for object expressions?

[njlr]

Unsure if this is a feature request or a bug.

I would like to put the opening brace of an object expression on its own line:

let sayGoodbye =
  { 
    new IDisposable with
      member this.Dispose() =
        println "Goodbye"
  }

But in the tool it puts it on the same line as new:

let sayGoodbye =
  { new IDisposable with
      member this.Dispose() = println "Goodbye"
  }

Is the format I am looking for possible?

Issue created from fantomas-online

Code

let sayGoodbye =
  {
    new IDisposable with
      member this.Dispose() =
        println "Goodbye"
  }

Result

let sayGoodbye =
  { new IDisposable with
      member this.Dispose() = println "Goodbye"
  }

Problem description

Please describe here the Fantomas problem you encountered.
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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 2026-09-11T07:35:37Z - 4ec27ee

    { config with
                IndentSize = 2
                SpaceBeforeColon = true
                RecordMultilineFormatter = number_of_items
                ArrayOrListMultilineFormatter = number_of_items
                MultiLineLambdaClosingNewline = true
                BarBeforeDiscriminatedUnionDeclaration = true }

_{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.}

[nojaf]

Hello, the default option align for fsharp_multiline_bracket_style is following the G-Research style conventions.

This is working as expected and I don't have any appetite to add a fourth way of formatting records.

[njlr]

Hello, the default option align for fsharp_multiline_bracket_style is following the G-Research style conventions.

This is working as expected and I don't have any appetite to add a fourth way of formatting records.

Interesting - I was trying to follow their convention for records - didn't realize they put object expressions on one line: https://github.com/G-Research/fsharp-formatting-conventions/tree/master#formatting-object-expressions-and-interfaces

Thanks!