5d73c06b1a
This is a persistent, structurally sharing data structure which is more efficient in some of our use-cases. I have verified the efficiency improvement using `hyperfine` repeatedly over expressions on nixpkgs. Lists are not the most performance-critical structure in Nix (that would be attribute sets), but we can already see a small (~5-10%) improvement. Note that there are a handful of cases where we still go via `Vec` that need to be fixed, most notable for `builtins.sort` which can not currently be implemented directly using `im::Vector` because of a restrictive type bound. Change-Id: I237cc50cbd7629a046e5a5e4601fbb40355e551d Reviewed-on: https://cl.tvl.fyi/c/depot/+/7670 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org> |
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