anchor.diff:      
       let tokenSymbol = 
         { TokenInfo = token; SymbolUse = symbol; ExtraColorInfo = extraColor }
  -    
  +
       let chunkStyle =
         match tokenSymbol with
         | InactiveCode -> style.ExcludedCode
  
positive.code:     match ts with
      | IdentifierSymbol symbolUse -> 
        match symbolUse with
        | SymbolUse.Field _ -> Some symbolUse.IsFromDefinition
        | _ -> None
      | _ -> None
    
  
negative.code:     match ts with
      | IdentifierSymbol symbolUse -> 
        match symbolUse with
        | SymbolUse.Val v -> Some (symbolUse.IsFromDefinition, v.IsMutable)
        | _ -> None
      | _ -> None
    
  