[GHC] #8936: Irrefutable pattern failed in ghc 7.4.1
#8936: Irrefutable pattern failed in ghc 7.4.1 ----------------------------------+--------------------------------- Reporter: gahuber95 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.4.1 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+--------------------------------- Thanks for your attention! Gary (newbie) ########################################## class Show a => Show_Listable a where show_list :: [a] -> IO() instance Show_Listable a -> Show a where show_list lst = do print "gen list"; print lst lst :: Int -> [Int] lst i = [1,2,3] main = do show_list (lst 1) ###################################################### Output: $ ghc bull.hs -o bull [1 of 1] Compiling Main ( bull.hs, bull.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): compiler/rename/RnSource.lhs:429:14-81: Irrefutable pattern failed for pattern Data.Maybe.Just (inst_tyvars, _, SrcLoc.L _ cls, _) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8936 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#8936: Irrefutable pattern failed in ghc 7.4.1 ---------------------------------+---------------------------------- Reporter: gahuber95 | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: GHCi | Version: 7.4.1 Resolution: duplicate | Keywords: Operating System: Linux | Architecture: x86_64 (amd64) Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: ---------------------------------+---------------------------------- Changes (by monoidal): * status: new => closed * resolution: => duplicate Comment: Thanks for the report. This is already fixed in GHC 7.6: #5951. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8936#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#8936: Irrefutable pattern failed in ghc 7.4.1 ---------------------------------+---------------------------------- Reporter: gahuber95 | Owner: Type: bug | Status: closed Priority: normal | Milestone: 7.6.1 Component: Compiler | Version: 7.4.1 Resolution: duplicate | Keywords: Operating System: Linux | Architecture: x86_64 (amd64) Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: ---------------------------------+---------------------------------- Changes (by hvr): * cc: hvr (removed) * component: GHCi => Compiler * milestone: => 7.6.1 Old description:
Thanks for your attention! Gary (newbie)
########################################## class Show a => Show_Listable a where show_list :: [a] -> IO()
instance Show_Listable a -> Show a where show_list lst = do print "gen list"; print lst
lst :: Int -> [Int] lst i = [1,2,3]
main = do show_list (lst 1)
###################################################### Output:
$ ghc bull.hs -o bull [1 of 1] Compiling Main ( bull.hs, bull.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): compiler/rename/RnSource.lhs:429:14-81: Irrefutable pattern failed for pattern Data.Maybe.Just (inst_tyvars, _, SrcLoc.L _ cls, _)
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
New description: Thanks for your attention! Gary (newbie) {{{#!haskell class Show a => Show_Listable a where show_list :: [a] -> IO() instance Show_Listable a -> Show a where show_list lst = do print "gen list"; print lst lst :: Int -> [Int] lst i = [1,2,3] main = do show_list (lst 1) }}} Output: {{{ $ ghc bull.hs -o bull [1 of 1] Compiling Main ( bull.hs, bull.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): compiler/rename/RnSource.lhs:429:14-81: Irrefutable pattern failed for pattern Data.Maybe.Just (inst_tyvars, _, SrcLoc.L _ cls, _) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8936#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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