anchor.diff:      }
   
       ///
  -    let createGlobalScope() =
  -      {createFunctionScope()with ScopeType = ScopeType.GlobalScope}
  +    let createGlobalScope() = {
  +      createFunctionScope() with 
  +        ScopeType = ScopeType.GlobalScope
  +    }
         
       ///
       let createCatchScope name globalLevel closureLevel = ref {
  
positive.code:     SelfReference : string option
  
      Functions: Map<string, Tree>
      Variables : VariableMap
      CatchScopes : CatchScope ref list
      ParameterNames : string list
      Globals : string Set
  
negative.code:     | Break of string option
      | Continue of string option
      | IfElse of Tree * Tree * Tree option
      | Switch of Tree * Cases list
      | Try of Tree * Tree option * Tree option
      | Catch of string * Tree
      | Throw of Tree
      | Var of Tree
      | Block of Tree list
  
      // Expressions
      | Eval of Tree
      | Identifier of string
      | Index of Tree * Tree
      | Property of Tree * string
      | Invoke of Tree * Tree list
      | Function of string option * FunctionScope ref * Tree
  
      // Internal node types
      | Pass
      | DlrExpr   of Dlr.Expr
      | Convert   of uint32 * Tree
      | Directive of Directive
      | Line      of string * int
  
    /// Switch statement cases
    and Cases 
  