FireFragment

How is this PR going and what needs to be done yet? Do you plan to continue developing this PR? (last commit was done a year ago) I'm eager for...

> @ipetkov There's no way out of this except for splitting up your build into multiple derivations and cleaning our any "unused" bits from Cargo.lock manually. Is there some conceptual...

It looks like that in nixpkgs 22 and lower, the cargo and rust versions are too old to compile the `openssl` crate, so I just disabled the test on nixpkgs...

Thanks @zambony! That's a fine option when returning a single string, but it doesn't work well for strings inside classes/structs.

> @izolyomi: I've also just encountered this issue. Are there any updates to do this properly instead of using out parameters? I managed to get around this by creating function...