I should probably also quote more variables generally in the nix-writers. just to have a uniform style (more quoting is better than less quoting)

Do we maybe want to add an optional strip argument to writeHaskell, writeC, writeRust? and inherit it in the call to makeBinWriter?

more quoting is better than less quoting

At least the standard $out does not require quoting because the path can't contain spaces, new lines, etc.

I should probably also quote more variables generally in the nix-writers. just to have a uniform style (more quoting is better than less quoting)

Do we maybe want to add an optional strip argument to writeHaskell, writeC, writeRust? and inherit it in the call to makeBinWriter?

I added a strip argument to those, good idea :-)
i wish we had "rustcWithPackages" or something, but I am not familiar enough with rust internals to write that yet, and its out of scope of this pr I think.

ah, can you also add a test (at least a bin one) into https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/writers/test.nix ? simple would also be cool when you figure out how to use libraries :)

ah, can you also add a test (at least a bin one) into https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/writers/test.nix ? simple would also be cool when you figure out how to use libraries :)

I added a trivial test. The thing with libraries is that the rust world universally uses cargo for that, so if you need libs, you are probably better off using buildRustPackage proper.

I’ve been using these rust writers with some success:
https://cs.tvl.fyi/depot@1261616bff04b6a5cb966778da8a336245c08979/-/blob/users/Profpatsch/writers/default.nix#L75-112

They are just wrappers around buildRustPackage, which has the advantage that they can use anything created by buildRustPackage as a dependency, e.g. see the tests in https://cs.tvl.fyi/depot@1261616bff04b6a5cb966778da8a336245c08979/-/blob/users/Profpatsch/writers/tests.nix