Myriad throws errors when trying to process a file with new F# syntax

[OrfeasZ]

I have a file that has a type that looks similar to this:

type MyType = {
  items: MyItem list
} with
  member self.itemIds = self.items |> List.map _.id

This uses the new _. shorthand syntax introduced in F# 8.

When trying to process this file, Myriad fails with the following error (and a bunch more after it):

OTHER: System.Exception: Error in Myriad.Plugins.LensesGenerator: LensesGenerator Failure
!CompilationError
Fantomas.Core.ParseException: ParseException
  [{ Severity = Error
     SubCategory = "parse"
     Range = Some (937,107--937,108)
     ErrorNumber = Some 10
     Message = "Unexpected symbol '_' in expression" };

Is this just a matter of updating the version of the F# compiler services & Fantomas used by Myriad? If so I'm happy to give it a go and submit a PR.

[joprice]

I tried out updating fantomas and hit only one issue with CreateImplicitCtor where SynSimplePats switch to SynPat. I didn't have time to check what the right value should be, but after commenting it out, I was able to get it to run on code that uses the new placeholder function syntax https://github.com/MoiraeSoftware/myriad/compare/master...joprice:myriad:updateFantomas?expand=1#diff-bcdb0d0a4bdbc43b9b95e736fcaf924c2279e06b92feb05914291fd71db383ceR399

[7sharp9]

Yeah the version of FCS and Fantomas needs to be incremented to one that has the new AST components. Any updating the calls inot Fantomas that they changed.