Line comment disappears after format

[nojaf]

Issue created from fantomas-ui

Please describe here fantomas problem you encountered

Code

namespace Krach

module Runner =

    let mPerSecond = 1000<m/second> // foo

    [<Measure>]
    type ProcessId =
        class
        end

Result

namespace Krach

module Runner =

    let mPerSecond = 1000<m/second>

    [<Measure>]
    type ProcessId =
        class
        end

Options

Fantomas Next - 3.1.1-12/11/2019

Name	Value
IndentOnTryWith	false
IndentSpaceNum	4
KeepNewlineAfter	false
MaxIfThenElseShortWidth	40
PageWidth	120
ReorderOpenDeclaration	false
SemicolonAtEndOfLine	false
SpaceAfterComma	true
SpaceAfterSemicolon	true
SpaceAroundDelimiter	true
SpaceBeforeArgument	true
SpaceBeforeColon	false
StrictMode	false

The // foo is gone