Context
Right now we only have a testgen-hs patch for the Nix build. It would be good to also support aarch64-linux builds with pure Cargo.
There's a blocker in that Haskell.nix doesn’t want to link statically on aarch64-linux. I've already asked @hamishmack for help (Slack thread).
We could instead compile a relocatable bundle for that system, and publish that, if static linking turns out to be too hard for now.
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