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| 2026-01-05 02:34:16 +0100 | <haskellbridge> | <loonycyborg> Sometimes should be converted into "fail" |
| 2026-01-05 02:34:02 +0100 | <c_wraith> | yeah, just the usual error about a pattern match failure |
| 2026-01-05 02:33:45 +0100 | <haskellbridge> | <loonycyborg> Same thing as usual? |
| 2026-01-05 02:33:33 +0100 | <haskellbridge> | <loonycyborg> and what happens in case of non-exhaustive match at runtime? |
| 2026-01-05 02:33:17 +0100 | <haskellbridge> | <loonycyborg> Ah makes sense I guess |
| 2026-01-05 02:32:14 +0100 | <c_wraith> | loonycyborg: You need the BangPatterns extension, then you mark the match with ! |
| 2026-01-05 02:31:49 +0100 | <haskellbridge> | <loonycyborg> Like you said they're irrefutable "by default" |
| 2026-01-05 02:31:47 +0100 | <haskellbridge> | <loonycyborg> How can you make patterns in let and where refutable? |
| 2026-01-05 02:30:33 +0100 | <int-e> | c_wraith: yes |
| 2026-01-05 02:29:56 +0100 | <c_wraith> | Yeah. "irrefutable" is a slightly weird way of saying "trust the programmer, you don't need to check this immediately" |
| 2026-01-05 02:29:49 +0100 | <oats> | t'would appear |
| 2026-01-05 02:29:40 +0100 | <yahb2> | *** Exception: Prelude.undefined ; ; HasCallStack backtrace: ; undefined, called at <interactive>:157:6 in interactive:Ghci16 |
| 2026-01-05 02:29:40 +0100 | <oats> | % case undefined of ~(a,b) -> b |
| 2026-01-05 02:29:09 +0100 | <oats> | and irrefutable patterns are lazy? |
| 2026-01-05 02:28:50 +0100 | <c_wraith> | int-e: ah, you're still running lambdabot? I wasn't sure. |
| 2026-01-05 02:28:40 +0100 | <int-e> | (lamdbabot was perfectly alive, just not joined here) |
| 2026-01-05 02:28:39 +0100 | jj_ | jj |
| 2026-01-05 02:28:39 +0100 | jj | (~apropos@d154-20-120-135.bchsia.telus.net) (Ping timeout: 244 seconds) |
| 2026-01-05 02:28:11 +0100 | <int-e> | it probably got blocked by +r |
| 2026-01-05 02:28:00 +0100 | <yahb2> | *** Exception: Prelude.undefined ; ; HasCallStack backtrace: ; undefined, called at <interactive>:155:6 in interactive:Ghci16 |
| 2026-01-05 02:28:00 +0100 | <oats> | % case undefined of (a,b) -> () |
| 2026-01-05 02:27:59 +0100 | jj_ | (~apropos@node-1w7jr9pqogh9vahu1mvneock5.ipv6.telus.net) omentic |
| 2026-01-05 02:27:35 +0100 | <lambdabot> | () |
| 2026-01-05 02:27:34 +0100 | <c_wraith> | > case undefined of ~(a, b) -> () -- you can use ~ to make a match in a case irrefutable |
| 2026-01-05 02:26:26 +0100 | <EvanR> | wow |
| 2026-01-05 02:26:15 +0100 | merijn | (~merijn@host-cl.cgnat-g.v4.dfn.nl) (Ping timeout: 240 seconds) |
| 2026-01-05 02:25:00 +0100 | divlamir | (~divlamir@user/divlamir) divlamir |
| 2026-01-05 02:24:57 +0100 | <c_wraith> | EvanR: Irrefutable matches just create thunks. and in a let/where, matches are irrefutable by default. |
| 2026-01-05 02:24:49 +0100 | divlamir | (~divlamir@user/divlamir) (Read error: Connection reset by peer) |
| 2026-01-05 02:24:21 +0100 | ChanServ | +v lambdabot |
| 2026-01-05 02:24:21 +0100 | lambdabot | (~lambdabot@haskell/bot/lambdabot) lambdabot |
| 2026-01-05 02:24:09 +0100 | <yahb2> | <interactive>:153:5: warning: [GHC-53633] [-Woverlapping-patterns] ; Pattern match is redundant ; In a pattern binding: Just x = ... ; ; () |
| 2026-01-05 02:24:09 +0100 | <EvanR> | % let Just x = Nothing in () |
| 2026-01-05 02:23:32 +0100 | <c_wraith> | Well, anyway. (let Just x = Nothing in ()) evaluates to (). (case Nothing of Just x -> ()) is a pattern match error. |
| 2026-01-05 02:23:30 +0100 | <EvanR> | doesn't immediately evaluate? |
| 2026-01-05 02:23:15 +0100 | <EvanR> | but let Pattern x y z = hopefullyPattern in e ? |
| 2026-01-05 02:22:53 +0100 | <EvanR> | let x = whatever in y, a thunk makes sense |
| 2026-01-05 02:22:25 +0100 | <c_wraith> | huh. lambdabot isn't in here right now |
| 2026-01-05 02:21:38 +0100 | merijn | (~merijn@host-cl.cgnat-g.v4.dfn.nl) merijn |
| 2026-01-05 02:21:38 +0100 | <c_wraith> | > let Just x = Nothing in () |
| 2026-01-05 02:21:14 +0100 | <c_wraith> | let/where create a thunk when they match on a pattern. case forces evaluation. |
| 2026-01-05 02:20:37 +0100 | <oats> | why does so much code in base and ghc use `case` for binding instead of `let` or `where`? like here: https://hackage-content.haskell.org/package/ghc-internal-9.1401.0/docs/src/GHC.Internal.Arr.html#n… |
| 2026-01-05 02:20:10 +0100 | Tuplanolla | (~Tuplanoll@88-114-88-95.elisa-laajakaista.fi) (Quit: Leaving.) |
| 2026-01-05 02:11:02 +0100 | merijn | (~merijn@host-cl.cgnat-g.v4.dfn.nl) (Ping timeout: 256 seconds) |
| 2026-01-05 02:09:49 +0100 | jmcantrell_ | (~weechat@user/jmcantrell) jmcantrell |
| 2026-01-05 02:08:47 +0100 | omidmash1 | omidmash |
| 2026-01-05 02:08:47 +0100 | omidmash | (~omidmash@user/omidmash) (Ping timeout: 256 seconds) |
| 2026-01-05 02:06:30 +0100 | omidmash1 | (~omidmash@user/omidmash) omidmash |
| 2026-01-05 02:05:54 +0100 | merijn | (~merijn@host-cl.cgnat-g.v4.dfn.nl) merijn |
| 2026-01-05 01:55:13 +0100 | merijn | (~merijn@host-cl.cgnat-g.v4.dfn.nl) (Ping timeout: 264 seconds) |