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|  mra joined the room. | 07:25:22 |
| mra | Howdy! Having some issues trying to set up a flake for development. I'm trying to use Clash to do FPGA stuff. The authors of Clash provide this starter template: https://github.com/clash-lang/clash-starters/tree/main/simple-nix, but I wanted to try to make a flake, thinking that it would be simpler to simply define a package, and then use nix develop to obtain a dev environment. I wrote this flake: https://paste.rs/guCkG.txt and just replaced all of the .nix files with this. It seems to work, but when I attempt to run the clash executable, I get a weird error: "<command line>: Could not find module ‘GHC.TypeLits.KnownNat.Solver’.". I can't figure out what causes this, and it doesn't happen when I run nix-develop in the root of the template as given, which is strange, since in both cases the build is just using runCabal2nix, rather than explicitly including this GHC plugin as a build input explicitly. | 07:29:35 |
 maralorn | @morgan.arnold:matrix.org One theory would be, that your flake is picking a different nixpkgs version. The template seems to be pinned to a known good version. | 07:51:34 |
| mra | oh, that's bizarre. somehow didn't notice all of the weirdness in the nix/ directory... is there a straightforward way of copying over the nix/ directory and then using that as the nixpkgs input for my flake? that seems like the simplest way to ensure that the versions are all good | 08:29:59 |
 Pierre Thierry | I'll try that, that's way simpler than anything already shown as example for `shellFor`! | 10:36:26 |
| maralorn | mra: the nixpkgs pin in the nix/ dir should have a commit hash somewhere. You can put that commit hash in the nixpkgs input in the flake. (see nix manual for syntax) | 10:36:53 |
 sterni (he/him) | An alternative is to use callCabal2nix in the packages function which would generate the expression on the fly. (Basically like developPackage, but developPackage would, I think, not work since it behaves differently depending on whether the IN_NIX_SHELL environment variable is set.) | 11:36:33 |
