2024/11/15

2024-11-15 00:03:51 +0100 <jackdk> carbolymer: I don't understand your suggestion. The typeclass I want to type-family-ify exists and I cannot change it (concrete example: `GHC.Records.HasField`), but I want a type family that can select the field type. This example fails with "The RHS of an associated type declaration mentions out-of-scope variable ā€˜zā€™ All such variables must be bound on the LHS" https://www.irccloud.com/pastebin/4aygJmq9/MakeATypeFamily.hs
2024-11-15 00:06:26 +0100rvalue-(~rvalue@user/rvalue) rvalue
2024-11-15 00:07:19 +0100rvalue(~rvalue@user/rvalue) (Ping timeout: 260 seconds)
2024-11-15 00:10:34 +0100rvalue-rvalue
2024-11-15 00:19:05 +0100 <carbolymer> jackdk: ah, you can't modify the original class - that' s though
2024-11-15 00:20:06 +0100 <carbolymer> s/though/tough
2024-11-15 00:24:54 +0100nek0(~nek0@user/nek0) (Quit: The Lounge - https://thelounge.chat)
2024-11-15 00:26:44 +0100 <carbolymer> jackdk: maybe something in this direction https://paste.tomsmeding.com/Og2LnIpN ?
2024-11-15 00:29:03 +0100 <jackdk> The problem is I didn't know `a` at the time. (I was trying to write some servant-flavoured stuff, and wanted to provide an analogue to `ToServantApi` that extracted a single field). So I don't actually know the final type (because there are other TFs involved) but I know GHC does
2024-11-15 00:30:01 +0100aljazmc(~aljazmc@user/aljazmc) (Remote host closed the connection)
2024-11-15 00:30:32 +0100 <carbolymer> ah
2024-11-15 00:31:05 +0100ljdarj1(~Thunderbi@user/ljdarj) ljdarj
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2024-11-15 00:48:36 +0100 <sm> @where+ wiwik https://gotchamana.github.io/wiwinwlh What I Wish I Knew When Learning Haskell, Stephen Diehl
2024-11-15 00:48:37 +0100 <lambdabot> Good to know.
2024-11-15 00:48:39 +0100 <sm> found!
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