double-backtick identifier is formatted wrong when starts with non-alphanum character

[jindraivanek]

Issue created from fantomas-ui

Code

// not working
let ``!foo hoo`` () = ()
let ``@foo hoo`` () = ()
let ``$foo hoo`` () = ()
let ``%foo hoo`` () = ()
let ``^foo hoo`` () = ()
let ``&foo hoo`` () = ()
let ``*foo hoo`` () = ()
let ``<foo hoo`` () = ()
let ``>foo hoo`` () = ()
let ``=foo hoo`` () = ()
let ``-foo hoo`` () = ()
let ``|foo hoo`` () = ()

// works
let ``#foo hoo`` () = ()
let ``(foo hoo`` () = ()
let ``)foo hoo`` () = ()
let ``_foo hoo`` () = ()
let ``.foo hoo`` () = ()
let ``\foo hoo`` () = ()
let ``🐛foo hoo`` () = ()

// constants works
let ``!foo hoo`` = ()
let ``@foo hoo`` = ()

Error

// not working
let (!foo hoo) () = ()
let (@foo hoo) () = ()
let ($foo hoo) () = ()
let (%foo hoo) () = ()
let (^foo hoo) () = ()
let (&foo hoo) () = ()
let ( *foo hoo ) () = ()
let (<foo hoo) () = ()
let (>foo hoo) () = ()
let (=foo hoo) () = ()
let (-foo hoo) () = ()
let (|foo hoo) () = ()

// works
let ``#foo hoo`` () = ()
let ``(foo hoo`` () = ()
let ``)foo hoo`` () = ()
let ``_foo hoo`` () = ()
let ``.foo hoo`` () = ()
let ``\foo hoo`` () = ()
let ``🐛foo hoo`` () = ()

// constants works
let ``!foo hoo`` = ()
let ``@foo hoo`` = ()

Options

Fantomas Next - 3.3.0-4/8/2020

Name	Value
IndentOnTryWith	false
IndentSpaceNum	4
KeepNewlineAfter	false
MaxIfThenElseShortWidth	40
PageWidth	120
ReorderOpenDeclaration	false
SemicolonAtEndOfLine	false
SpaceAfterComma	true
SpaceAfterSemicolon	true
SpaceAroundDelimiter	true
SpaceBeforeClassConstructor	false
SpaceBeforeColon	false
SpaceBeforeLowercaseInvocation	true
SpaceBeforeMember	false
SpaceBeforeParameter	true
SpaceBeforeSemicolon	false
SpaceBeforeUppercaseInvocation	false
StrictMode	false