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Logs: liberachat/#haskell

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2021-06-15 11:26:38 → fizbin joins (~fizbin@2601:8a:4080:1280:8c7e:5b3f:79d6:ec26)
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2021-06-15 11:57:29 × dunkeln quits (~dunkeln@94.129.65.28) (Ping timeout: 244 seconds)
2021-06-15 11:58:57 <zyklotomic> is there a way to deduce a type from a variable? i'm not sure if this is a language extension for it
2021-06-15 11:59:12 <zyklotomic> https://gist.github.com/zyklotomic/d1e7eb54e74ea53dcb9a5f616d362dc8 here is an example of where i'm trying to do that
2021-06-15 12:00:10 <zyklotomic> *if there is
2021-06-15 12:00:25 <merijn> zyklotomic: Ah, you want ScopedTypeVariables
2021-06-15 12:00:43 <merijn> zyklotomic: That lets you refer to type variables from your top-level signature in the body
2021-06-15 12:00:57 <merijn> so you can do "minBound :: a" with 'a' being equal to the 'a' in the top level type
2021-06-15 12:01:07 <merijn> @where user-guide
2021-06-15 12:01:07 <lambdabot> I know nothing about user-guide.
2021-06-15 12:01:12 <merijn> @where userguide
2021-06-15 12:01:12 <zyklotomic> merijn: ah thank you, appreciate it
2021-06-15 12:01:12 <lambdabot> https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/
2021-06-15 12:01:19 → henninb joins (~user@63.226.174.157)
2021-06-15 12:01:25 <merijn> GHC User Guide should have a section explaining the extensio
2021-06-15 12:02:03 <zyklotomic> the hard part is knowing how to explain specific niche use cases lol, and just the gut feeling there probably is an extension for it
2021-06-15 12:03:33 <merijn> zyklotomic: If you have an 'a' available there's also
2021-06-15 12:03:35 <merijn> :t asTypeOf
2021-06-15 12:03:37 <lambdabot> a -> a -> a
2021-06-15 12:03:47 <merijn> > minBound `asTypeOf` True
2021-06-15 12:03:49 <lambdabot> False
2021-06-15 12:03:53 <merijn> > minBound `asTypeOf` 'c'
2021-06-15 12:03:55 <lambdabot> '\NUL'
2021-06-15 12:04:41 <merijn> zyklotomic: Basically, asTypeOf is just const (i.e. returns first argument), but the type signature of asTypeOf lets you guide type inference with the second value
2021-06-15 12:04:50 × oxide quits (~lambda@user/oxide) (Read error: Connection reset by peer)
2021-06-15 12:05:49 <merijn> Although, looking at your example, probably ScopedTypeVariables is a better/easier solution
2021-06-15 12:05:59 <merijn> Since you don't actually have an 'a' available
2021-06-15 12:06:48 <merijn> zyklotomic: otoh, if you're just gonna apply a function to it, you might not even need that
2021-06-15 12:06:56 <merijn> :t [minBound .. maxBound]
2021-06-15 12:06:57 <lambdabot> (Bounded a, Enum a) => [a]
2021-06-15 12:07:09 <merijn> :t map isDigit [minBound .. maxBound]
2021-06-15 12:07:10 <lambdabot> [Bool]
2021-06-15 12:07:15 <merijn> > map isDigit [minBound .. maxBound]
2021-06-15 12:07:17 <lambdabot> [False,False,False,False,False,False,False,False,False,False,False,False,Fal...
2021-06-15 12:07:34 → dunkeln joins (~dunkeln@94.129.65.28)
2021-06-15 12:07:50 <merijn> zyklotomic: So if you're gonna just apply the function from your CountMap to the resulting list, you don't even need the type, it will just be inferred
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2021-06-15 12:34:49 → azeem joins (~azeem@176.201.22.245)
2021-06-15 12:34:54 <xsperry> > filter isDigit [minBound .. maxBound]
2021-06-15 12:34:56 <lambdabot> "0123456789"
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2021-06-15 12:53:00 → jakalx joins (~jakalx@base.jakalx.net)
2021-06-15 12:53:21 <merijn> > filter isNumber [minBound .. maxBound]
2021-06-15 12:53:23 <lambdabot> "0123456789\178\179\185\188\189\190\1632\1633\1634\1635\1636\1637\1638\1639\...
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2021-06-15 12:53:26 <merijn> oh, wait
2021-06-15 12:53:30 <merijn> > text filter isNumber [minBound .. maxBound]
2021-06-15 12:53:31 <lambdabot> error:
2021-06-15 12:53:32 <lambdabot> • Couldn't match expected type ‘(Char -> Bool) -> [a1] -> t’
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