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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://haskell4nix.readthedocs.io/141 Servers

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20 Feb 2026
@alexfmpe:matrix.orgalexfmpelooks like it00:02:33
@alexfmpe:matrix.orgalexfmpedisturbing but whatever00:02:42
@alexfmpe:matrix.orgalexfmpe I really don't see how ''$ improves on \$ 00:03:40
@woobilicious:matrix.orgwoobilicious
nix-repl> ''''$''
"$"

nix-repl> ''abc''$def''
"abc$def"
00:05:04
@alexfmpe:matrix.orgalexfmpewhat the hell00:05:13
@woobilicious:matrix.orgwoobiliciousMine gives a different result lol00:05:17
@alexfmpe:matrix.orgalexfmpe
 nix-repl> "abc\${def}"    
"abc\${def}"

nix-repl> ''abc\${def}''
error: undefined variable 'def'
       at «string»:1:9:
            1| ''abc\${def}''
             |         ^
00:05:20
@alexfmpe:matrix.orgalexfmpenah, I used both 1 and 2 single quotes above00:06:00
@alexfmpe:matrix.orgalexfmpeyours is the same as my 2 ', just not the 1 '00:06:27
@alexfmpe:matrix.orgalexfmpe *
nix-repl> "abc\${def}"    
"abc\${def}"

nix-repl> ''abc\${def}''
error: undefined variable 'def'
       at «string»:1:9:
            1| ''abc\${def}''
             |         ^
00:06:48
@woobilicious:matrix.orgwoobiliciousI guess maybe there's instances where you want to pass escapes from variables00:07:03
@woobilicious:matrix.orgwoobiliciousoh yeah somehow I thought you had two singles on that line00:07:36
@alexfmpe:matrix.orgalexfmpe
nix-repl> "abc''\def"    
"abc''def"
00:07:41
@alexfmpe:matrix.orgalexfmpe????00:07:44
@woobilicious:matrix.orgwoobilicious Tho \\ should just work lol 00:07:54
@alexfmpe:matrix.orgalexfmpeoh nevermind I don't have $ there00:08:31
@alexfmpe:matrix.orgalexfmpestill, don't much care for this escape-differently-in-multiline-strings business00:09:07
@alexfmpe:matrix.orgalexfmpehttps://nix.dev/manual/nix/2.24/language/syntax00:10:00
@alexfmpe:matrix.orgalexfmpe* still, don't much care for this escape-differently-in-indented-strings business00:10:11
@alexfmpe:matrix.orgalexfmpe ''\ escapes any other character. 00:10:21
@woobilicious:matrix.orgwoobilicious yeah I also don't know how it's sane to parse... I guess '' blah '' ${def} is invalid syntax, but still 00:10:26
@alexfmpe:matrix.orgalexfmpeneeds to know what goes after the '' to determine if it's the $ or we're ending the literal00:11:45
@woobilicious:matrix.orgwoobiliciousMentally parsing it definitely sucks, that has got to be the worst design idea beating space seperated lists by a tone. 00:13:42
@woobilicious:matrix.orgwoobilicious I guess it makes it easier to read than having like \\\\\\ -> ''\''\''\ 00:21:04
@woobilicious:matrix.orgwoobiliciousWho should I at in the PR?01:04:28
@woobilicious:matrix.orgwoobiliciousnevermind I think I found the list.01:07:57
@sternenseemann:systemli.orgsterni woobilicious: we should run at least some of the tests with sbv given how much intervention it needs 10:44:46
@sternenseemann:systemli.orgsterni45min test execution time is not really a problem in most cases10:45:08
@woobilicious:matrix.orgwoobilicious sterni: upstream recommends turning tests off, and I have zero clue how to disable test sets and a lot of them are broken due to nix paths being checked in the test suite. I don't know what you mean by "given how much intervention it needs", the package has been marked for 3 years as broken only due to missing optional binaries, the aforementioned path mismatches causing test failures. SBV seems to be working for me fine here. Note that sbv tests do code generation for SAT solvers, and then calls those SAT solves, these are not trivial fixes. 12:08:20
@magic_rb:matrix.redalder.orgmagic_rb alexfmpe
the escape character for "" is \, the escape character(s) for '''' is ''
12:39:32

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