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2020-11-03 15:43:59 × sfvm quits (~sfvm@37.228.215.148) (Quit: off to the basement, mixing up the medicine)
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2020-11-03 15:50:38 <tomsmeding> where lies the boundary between type checking and type inference? Determining that '(f :: Char -> Bool) ('c' :: Char)' has type Bool may not be "type inference", but what about inferring the type of '\(f :: Char -> Bool) (x :: Char) -> f x'?
2020-11-03 15:51:08 <merijn> tomsmeding: There's no inference there either since all intermediate types are annotated
2020-11-03 15:51:29 vicfred joins (~vicfred@unaffiliated/vicfred)
2020-11-03 15:51:31 <tomsmeding> what if 'x' had no annotation?
2020-11-03 15:51:36 <merijn> "\f -> (f (x :: Char) :: Bool)" would require inference
2020-11-03 15:51:42 <ziman> hello, what's the idiomatic way to match on impossible values in pattern clauses? currently i'm using an empty case expression but is there anything shorter, like agda's ()? i can't google up anything somehow
2020-11-03 15:51:44 × miladz68 quits (~manjaro-u@static.84.147.251.148.clients.your-server.de) (Ping timeout: 240 seconds)
2020-11-03 15:51:59 miladz68 joins (~manjaro-u@46.248.60.86)
2020-11-03 15:52:04 <merijn> 'f :: Char -> Bool' in that example, but the argument type of 'f' nor its result type are specified
2020-11-03 15:52:19 <merijn> tomsmeding: You have to reconstruct the argument and return type from context there
2020-11-03 15:52:30 <tomsmeding> so it becomes type inference if there is a variable with no annotated type?
2020-11-03 15:53:06 idhugo joins (~idhugo@80-62-116-101-mobile.dk.customer.tdc.net)
2020-11-03 15:53:08 × ensyde quits (~ensyde@99-185-235-117.lightspeed.chrlnc.sbcglobal.net) (Ping timeout: 246 seconds)
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2020-11-03 15:53:20 <tomsmeding> where annotating the type of a function is understood to also annotate the types of its arguments
2020-11-03 15:53:23 <merijn> For example
2020-11-03 15:54:19 <dminuoso> ziman: Void + absurd?
2020-11-03 15:55:01 × brodie quits (~textual@207.53.253.137) (Quit: brodie)
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2020-11-03 15:55:31 sh9 joins (~sh9@softbank060116136158.bbtec.net)
2020-11-03 15:55:31 hackage git-annex 8.20201103 - manage files with git, without checking their contents into git https://hackage.haskell.org/package/git-annex-8.20201103 (JoeyHess)
2020-11-03 15:55:37 <ziman> my argument does not belong in Void, it belongs in a GADT with indices that make it empty
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2020-11-03 15:56:26 <dolio> Can't you just leave the case out, then?
2020-11-03 15:56:38 JoelMcCracken[m] joins (joelmccrac@gateway/shell/matrix.org/x-hnsumqopegmivthi)
2020-11-03 15:57:37 <ziman> it's an annoying coincidence: it's an instance with a single method with a single clause, so when i leave the clause out, it complains that i did not provide the definition for the method
2020-11-03 15:58:08 alp joins (~alp@2a01:e0a:58b:4920:d16f:132:b740:cc6e)
2020-11-03 15:58:20 <dolio> Well, I don't think there's anything you can do but empty case, then.
2020-11-03 15:58:35 <ziman> right, thank you :)
2020-11-03 15:58:43 <ziman> it's not too bad, i was mostly curious
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2020-11-03 16:00:06 × JoelMcCracken[m] quits (joelmccrac@gateway/shell/matrix.org/x-hnsumqopegmivthi) (Client Quit)
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2020-11-03 16:04:30 hackage validationt 0.3.0 - Straightforward validation monad https://hackage.haskell.org/package/validationt-0.3.0 (typeable)
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