2026/01/22

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2026-01-22 04:07:28 +0100 <haskellbridge> <iqubic (she/her)> drop1 [1,2,3] -> [[2,3], [1,3], [1,2]]
2026-01-22 04:07:21 +0100 <haskellbridge> <iqubic (she/her)> I want a function that computes all the ways to remove a single element from a list.
2026-01-22 04:07:04 +0100 <haskellbridge> <iqubic (she/her)> I see....
2026-01-22 04:06:55 +0100 <geekosaur> I'm not quite sure what you're trying to do, to be honest. (in part because my focus is all over the place, I'm working on cabal atm and chasing around various housework things…)
2026-01-22 04:05:36 +0100 <haskellbridge> <iqubic (she/her)> How can I fix my code here?
2026-01-22 04:05:33 +0100merijn(~merijn@host-cl.cgnat-g.v4.dfn.nl) (Ping timeout: 252 seconds)
2026-01-22 04:05:06 +0100 <geekosaur> yeh, I have no clue about LML
2026-01-22 04:04:55 +0100Raito_Bezarius(~Raito@libera/contributor/wireguard.tunneler.raito-bezarius) (Ping timeout: 245 seconds)
2026-01-22 04:04:15 +0100 <geekosaur> xs :: [a]
2026-01-22 04:04:10 +0100 <geekosaur> map (x:) (drop1 xs) :: [[a]] -> [[a]]
2026-01-22 04:04:09 +0100 <EvanR> (unlikely to still be available and functioning)
2026-01-22 04:03:50 +0100 <EvanR> rather the compiler for it
2026-01-22 04:03:49 +0100 <geekosaur> drop1 :: [a] -> [[a]]
2026-01-22 04:03:43 +0100 <EvanR> and lazy ML was written in
2026-01-22 04:03:19 +0100 <haskellbridge> <iqubic (she/her)> drop1 (x:xs) = xs ++ map (x:) (drop1 xs)
2026-01-22 04:03:14 +0100 <haskellbridge> <iqubic (she/her)> geekosaur: Am I missing something obvious here?
2026-01-22 04:02:54 +0100 <geekosaur> I think there's an ancient i386 binary for HBC somewhere, but no source and no guarantee the binary would run on modern systems
2026-01-22 04:02:29 +0100Inline(~User@2001-4dd6-dd24-0-288a-d894-752e-65cf.ipv6dyn.netcologne.de) Inline
2026-01-22 04:01:25 +0100 <geekosaur> ghc was originally written in HBC, a now lost compiler which was itself written in Lazy ML
2026-01-22 04:01:10 +0100merijn(~merijn@host-cl.cgnat-g.v4.dfn.nl) merijn
2026-01-22 03:59:25 +0100 <haskellbridge> <iqubic (she/her)> I'm so lost here... What am I missing?
2026-01-22 03:58:59 +0100 <haskellbridge> <iqubic (she/her)> I'm trying to use the head of the iinput.
2026-01-22 03:58:56 +0100 <haskellbridge> <Nguyễn Trọng Cường> I have a really stupid question: Is the very first GHC executable written in C? I analysed some modern GHC programs by Detect It Easy and all of them are flagged as "C" and "MinGW"
2026-01-22 03:58:32 +0100 <geekosaur> rename the one in map, maybe it'll be a bit clearer (its "[a]" unifies with the "[[a]]" from drop1)
2026-01-22 03:58:20 +0100 <haskellbridge> <iqubic (she/her)> xxs?
2026-01-22 03:57:56 +0100 <geekosaur> xxs is only [a], not [[a]]
2026-01-22 03:57:35 +0100 <haskellbridge> <iqubic (she/her)> I fail to see the issue here.
2026-01-22 03:57:30 +0100 <haskellbridge> <iqubic (she/her)> (drop1 xs) :: [[a]]
2026-01-22 03:56:57 +0100 <haskellbridge> <iqubic (she/her)> (x:) :: [a] -> [a]
2026-01-22 03:56:36 +0100vidak(~vidak@2407:e400:7800:2c01:d0be:76f8:cc84:bd4a) (Remote host closed the connection)
2026-01-22 03:56:20 +0100 <haskellbridge> <iqubic (she/her)> I have "map (x:) (drop1 xs)"
2026-01-22 03:53:46 +0100 <geekosaur> xs is [a], drop1 xs is [[a]], map's result type will be the same as its input type as (x:) simply prepends to the inner lists
2026-01-22 03:53:04 +0100 <haskellbridge> <iqubic (she/her)> drop1 [1,2,3] -> [[2,3], [1,3], [1,2]]
2026-01-22 03:52:47 +0100 <haskellbridge> <iqubic (she/her)> I want a function that computes all the ways to drop a single element from a list.
2026-01-22 03:49:55 +0100 <haskellbridge> <iqubic (she/her)> Why isn't this compiling? https://paste.tomsmeding.com/7dBnZHnU
2026-01-22 03:49:51 +0100typedfern_(~Typedfern@192.red-83-37-37.dynamicip.rima-tde.net) (Ping timeout: 244 seconds)
2026-01-22 03:49:51 +0100merijn(~merijn@host-cl.cgnat-g.v4.dfn.nl) (Ping timeout: 244 seconds)
2026-01-22 03:49:20 +0100Inline(~User@2001-4dd6-dd24-0-41c1-f819-9bd9-d884.ipv6dyn.netcologne.de) (Ping timeout: 244 seconds)
2026-01-22 03:48:56 +0100tremon(~tremon@83.80.159.219) (Quit: getting boxed in)
2026-01-22 03:48:44 +0100 <haskellbridge> <iqubic (she/her)> What's the list comprehension version?
2026-01-22 03:47:40 +0100humasect(~humasect@dyn-192-249-132-90.nexicom.net) (Remote host closed the connection)
2026-01-22 03:45:49 +0100 <geekosaur> list monad with no actions is Cartesian product. maybe you'd find the list comprehension version easier to interpret?
2026-01-22 03:43:08 +0100merijn(~merijn@host-cl.cgnat-g.v4.dfn.nl) merijn
2026-01-22 03:32:13 +0100merijn(~merijn@host-cl.cgnat-g.v4.dfn.nl) (Ping timeout: 246 seconds)
2026-01-22 03:31:58 +0100vidak(~vidak@2407:e400:7800:2c01:d0be:76f8:cc84:bd4a) vidak
2026-01-22 03:30:44 +0100 <haskellbridge> <iqubic (she/her)> But sequenceA "foldr (liftA2 (:)) (pure [])" is a Cartesian product, and I'm not sure why.
2026-01-22 03:29:58 +0100 <haskellbridge> <iqubic (she/her)> Erm... not that. It's late and I'm tired.
2026-01-22 03:29:06 +0100 <haskellbridge> <iqubic (she/her)> "cart [[11,12], [21,22]]" is "[[11,21,22],[12,21,22]]"
2026-01-22 03:28:17 +0100 <haskellbridge> <iqubic (she/her)> How does that compute a Cartesian product though?
2026-01-22 03:27:21 +0100merijn(~merijn@host-cl.cgnat-g.v4.dfn.nl) merijn