Re: [GHC] #10734: pprint of ‘let’ inside ‘do’ prints invalid Haskell

GHC ghc-devs at haskell.org
Tue Aug 4 08:51:45 UTC 2015


#10734: pprint of ‘let’ inside ‘do’ prints invalid Haskell
-------------------------------------+-------------------------------------
        Reporter:  Fuuzetsu          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Template Haskell  |                 Version:  7.10.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by Fuuzetsu):

 One last comment in case someone else hits it. You can workaround with

 {{{#!hs
 Prelude Language.Haskell.TH Language.Haskell.TH.Ppr> pprint <$> runQ [| do
 { x <- return 5; return x; } |]
 "do {x_0 <- GHC.Base.return 5; GHC.Base.return x_0}"
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10734#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler


More information about the ghc-tickets mailing list