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This would not be advisable for anything other than error messages, because Nix does not commit to any semantics for that function.
The difference is that moduleLocation is "guaranteed" reliable data, whereas errorLocation is the best choice for error messages in the core. moduleLocation is suitable for the module key attribute. errorLocation is best for the *ROOT* module _file attribute. Initially I applied errorLocation in too many places. It is only needed when the flake output attribute names are strict in it. To avoid confusion, I'm not exposing errorLocation to the modules, until we have a concrete use case for it.
As mentioned in the previous commit, we don't have a use case for this in flake-parts yet, as far as I'm aware. It can be exposed when we do have a concrete use case where it is needed.
This was referenced Oct 13, 2023
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This improves on #158 by making the default module location automatic.
When
moduleLocationis specified, it behaves as in #158.If not, the default module location is determined from the
inputsattribute position, with fallback.I believe
moduleLocationis sufficient for the use cases in the flake-parts modules that were changed.I am currently not aware of a case where
errorLocationwould have to be exposed to the modules, so I'd like to keep the interface minimal until we find that.