[GHC] #11652: Cyclical dependencies aren't reported in pure functions
#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
#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 Resolution: | 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: | -------------------------------------+------------------------------------- Comment (by ezyang): Solving this problem in general would amount to solving the halting problem but I would definitely like to see some heuristics to give warnings in cases like this. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11652#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11652: Cyclical dependencies aren't reported in pure functions -------------------------------------+------------------------------------- Reporter: keynan | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Resolution: | 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: | -------------------------------------+------------------------------------- Changes (by simonpj): * type: bug => feature request Comment: It's a feature request, but yes even a (necessarily) partial check would be good. In this case it's harder because `(+)` is overloaded, so in principle mutual recursion might be just fine. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11652#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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