Is there any occourrence when using a lazy `sum` is more appropriate
#15521: Provide a strict version of sum -------------------------------------+------------------------------------- Reporter: dnadales | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: 8.6.1 Component: Prelude | Version: 8.4.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by ulysses4ever): Replying to [comment:1 f-a]: than using its stricter version? One might go with a usual non-termination argument: if you have divergent computation inside your list AND you don't actually use the result of `sum`, then you get a different behaviour. Similar argument applies for “expensive” computation inside the list. Also, Haskell Report (the Haskell standard) says that `sum` should behave lazily (AFAIK). So, changing the behavior of `sum` seems a bit of extreme to me. I'd rather argue for adding `sum' / product'` to `Prelude`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15521#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler