#16089: seq is not cooperating with :sprint in GHCi as expected -------------------------------------+------------------------------------- Reporter: radrow | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.6.3 Resolution: | Keywords: seq sprint | strictness Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by osa1): I can't reproduce this: {{{ GHCi, version 8.6.3: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/omer/rcbackup/.ghci λ:1> let x = [True, False] λ:2> :sprint x x = [True,False] }}} With 8.4.4: {{{ GHCi, version 8.4.4: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/omer/rcbackup/.ghci λ:1> let x = [True, False] λ:2> :sprint x x = [True,False] }}} With 8.2.2: {{{ GHCi, version 8.2.2: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/omer/rcbackup/.ghci λ:1> let x = [True, False] λ:2> :sprint x x = [True,False] }}} However if I use a list that is not completely static then I can see that `:sprint` doesn't print the evaluated constructor: {{{ GHCi, version 8.6.3: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/omer/rcbackup/.ghci λ:1> let x = [1..] λ:2> :sprint x x = _ λ:3> x `seq` () () λ:4> :sprint x x = _ }}} Even `:print` doesn't work as expected (I'd expect it to print something like `x : y`): {{{ λ:5> :print x x = (_t1::(Num a, Enum a) => [a]) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16089#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler