anchor.diff:              | If (condition, consequent, alternative, originOpt) -> evalIf condition consequent alternative originOpt env
               | Cond (exprPairs, originOpt) -> evalCond exprPairs originOpt env
               | Try (body, handlers, originOpt) -> evalTry body handlers originOpt env
  -            | Break (expr, _) -> (expr, env)
  +            | Break (expr, _) -> evalBreak expr env
               | Get (name, originOpt) -> evalGet name None originOpt env
               | GetFrom (name, expr, originOpt) -> evalGet name (Some expr) originOpt env
               | Set (name, expr, originOpt) -> evalSet name expr None originOpt env
  
positive.code:                     handlers
              | _ -> (evaled, env)
  
          and evalGet propertyName relationExprOpt originOpt env =
              let context = Env.getContext env
              let simulantAndEnvEir =
  
negative.code: namespace Nu
  open System
  open System.Collections.Generic
  open System.Diagnostics
  open OpenTK
  open Prime
  open Nu
  