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Rather than having them plain strings scattered through the whole
codebase, create an enum containing all the known experimental features.
This means that
- Nix can now `warn` when an unkwown experimental feature is passed
(making it much nicer to spot typos and spot deprecated features)
- It’s now easy to remove a feature altogether (once the feature isn’t
experimental anymore or is dropped) by just removing the field for the
enum and letting the compiler point us to all the now invalid usages
of it.
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I had started the trend of doing `std::visit` by value (because a type
error once mislead me into thinking that was the only form that
existed). While the optomizer in principle should be able to deal with
extra coppying or extra indirection once the lambdas inlined, sticking
with by reference is the conventional default. I hope this might even
improve performance.
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Enforce the use of properly built paths in libcmd
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Replace `DerivedPathWithHints` by a new `BuiltPath` type that serves as
a proof that the corresponding path has been built.
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This should fix the issue described in
https://discourse.nixos.org/t/derivation-does-not-have-wanted-outputs-dev-out/12905.
Specifically, we get an error of
error: derivation '/nix/store/_.drv' does not have wanted outputs 'dev,out'
when a path like /nix/store/_.drv!dev,out is sent to the daemon.
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Just a renaming for now
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