[GHC] #11652: Cyclical dependencies aren't reported in pure functions

[GHC]

#11652: Cyclical dependencies aren't reported in pure functions
-------------------------------------+-------------------------------------
           Reporter:  keynan         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  GHC accepts
  Unknown/Multiple                   |  invalid program
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 No compile error. found in 7.10.2


 {{{#!hs
 main :: IO ()
 main = do
   putStrLn $ "Hello " ++ (show x)
   where
     x = y + 1
     y = x + 1
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11652>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler