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2026-04-04 02:30:18 synchromesh joins (~john@2406:5a00:2412:2c00:343e:4e23:bce:73a3)
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2026-04-04 03:21:39 × synchromesh quits (~john@2406:5a00:2412:2c00:343e:4e23:bce:73a3) (Read error: Connection reset by peer)
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2026-04-04 03:31:52 <gentauro> `{-# OPTIONS_GHC -Wall -Werror #-}` is nice to help you remove "noise" come code files
2026-04-04 03:31:57 merijn joins (~merijn@host-cl.cgnat-g.v4.dfn.nl)
2026-04-04 03:32:23 <gentauro> however, once you `derive` Show on a data type, it no longer tells you which properties aren't being used :(
2026-04-04 03:33:18 <gentauro> btw, what does this do: `data FooBar = FooBar {-# UNPACK #-} !Int`. Like the `unpack` pragma combined with `Int`?
2026-04-04 03:35:44 <geekosaur> explicitly telling the compiler to unpack the `Int` into `FooBar` rather than making a pointer to it (which requires that it be strict)
2026-04-04 03:36:22 <geekosaur> these days you don't generally need to do that, `-funbox-small-strict-fields` is on by default if you compile with optimization
2026-04-04 03:36:23 <gentauro> geekosaur: does this only work for primitive (`struct` types)?
2026-04-04 03:36:44 <geekosaur> no
2026-04-04 03:37:38 <geekosaur> there used to be a number of restrictions on it but I think most of them are gone, only strictness remains. (for example, the type had to have a single constructor until unboxed sums were added and it became possible to support multi-constructor unpacking)
2026-04-04 03:37:46 <gentauro> `data FooBar = Foo | Bar; data BazQux = BazQux {-# UNPACK #-} !FooBar` would work as well?
2026-04-04 03:38:42 × merijn quits (~merijn@host-cl.cgnat-g.v4.dfn.nl) (Ping timeout: 255 seconds)
2026-04-04 03:40:22 jmcantrell_ joins (~weechat@user/jmcantrell)
2026-04-04 03:41:51 <geekosaur> https://downloads.haskell.org/ghc/latest/docs/users_guide/exts/pragmas.html#unpack-pragma (note that it tells you it won't work in your case, then only afterward mentions that it will in 9.6.1 and later)
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2026-04-04 03:46:11 × jmcantrell_ quits (~weechat@user/jmcantrell) (Ping timeout: 268 seconds)
2026-04-04 03:46:12 <gentauro> geekosaur: nice -> https://downloads.haskell.org/ghc/latest/docs/users_guide/exts/primitives.html#extension-UnboxedSums
2026-04-04 03:47:40 <gentauro> btw, do we have something similar to this `dotnet-dump` (heap memory): https://gitlab.com/spisemisu/SpiseMisu.Text.Dstring/-/blob/main/dotnet-cli-tools.sh?ref_type=heads#L19-100
2026-04-04 03:48:08 <gentauro> where you can drill down (mem) usage of an app?
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2026-04-04 03:50:00 merijn joins (~merijn@host-cl.cgnat-g.v4.dfn.nl)
2026-04-04 03:53:16 <geekosaur> https://discourse.haskell.org/t/ghc-profiling-a-cabal-project-with-an-interactive-application/10465 perhaps?
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2026-04-04 03:58:40 <gentauro> geekosaur: yeah, that's it.
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2026-04-04 06:36:53 <gentauro> % data FooBar = Foo | Bar; data BazQux = BazQux {-# UNPACK #-} !FooBar
2026-04-04 06:36:53 <yahb2> <no output>
2026-04-04 06:37:06 <gentauro> % sizeOf FooBar
2026-04-04 06:37:06 <yahb2> <interactive>:11:1: error: [GHC-88464] ; Variable not in scope: sizeOf :: t0 -> t1 ; ; <interactive>:11:8: error: [GHC-01928] ; • Illegal term-level use of the type constructor ‘FooBar’ ; ...
2026-04-04 06:37:19 <gentauro> % data FooBar = Foo | Bar; data BazQux = BazQux {-# UNPACK #-} !FooBar; sizeOf FooBar
2026-04-04 06:37:19 <yahb2> <interactive>:13:71: error: [GHC-25277] ; Parse error: module header, import declaration ; or top-level declaration expected.
2026-04-04 06:37:28 <gentauro> % data FooBar = Foo | Bar; data BazQux = BazQux {-# UNPACK #-} !FooBar; sizeOf Foo
2026-04-04 06:37:28 <yahb2> <interactive>:15:71: error: [GHC-25277] ; Parse error: module header, import declaration ; or top-level declaration expected.

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