anchor.diff:          let info = makeCallInfo None args [t; Boolean]
           let value = makeCall r Unit info value
           Delegate([v], value, None)
  -    Helper.LibCall(com, "types", "FSharpRef", t, [getter; setter], isJsConstructor=true)
  +    Helper.LibCall(com, "types", "FSharpRef", t, [getter; setter], isPyConstructor=true)
   
   // let turnLastArgIntoRef com ctx args =
   //     let args, defValue = List.splitLast args
  
positive.code:     match thisArg with
      | None ->
          match i.CompiledName with
          | ".ctor" -> Helper.LibCall(com, "mailbox_processor", "MailboxProcessor", t, args, i.SignatureArgTypes, isJsConstructor=true, ?loc=r) |> Some
          | "Start" -> Helper.LibCall(com, "mailbox_processor", "start", t, args, i.SignatureArgTypes, ?loc=r) |> Some
          | _ -> None
      | Some callee ->
  
negative.code:         makeImportLib com returnType coreMember coreModule
  
      static member LibCall(com, coreModule: string, coreMember: string, returnType: Type, args: Expr list,
                             ?argTypes: Type list, ?thisArg: Expr, ?hasSpread: bool, ?isPyConstructor: bool, ?loc: SourceLocation) =
          let callee = makeImportLib com Any coreMember coreModule
          let info = makeCallInfo thisArg args (defaultArg argTypes [])
          Call(callee, { info with HasSpread = defaultArg hasSpread false
                                   IsConstructor = defaultArg isPyConstructor false }, returnType, loc)
  
      static member GlobalCall(ident: string, returnType: Type, args: Expr list, ?argTypes: Type list,
                               ?memb: string, ?isPyConstructor: bool, ?loc: SourceLocation) =
          let callee =
              match memb with
              | Some memb -> getAttachedMember (makeIdentExpr ident) memb
              | None -> makeIdentExpr ident
          let info = makeCallInfo None args (defaultArg argTypes [])
          Call(callee, { info with IsConstructor = defaultArg isPyConstructor false }, returnType, loc)
  
      static member GlobalIdent(ident: string, memb: string, typ: Type, ?loc: SourceLocation) =
          getAttachedMemberWith loc typ (makeIdentExpr ident) memb
  