Delete try (now defined in System.IO.Error), bracket and bracket_ (now defined in IO).
Delete try (now defined in System.IO.Error), bracket and bracket_
(now defined in IO).

FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs