Move value-only methods to InstallableValue
#7757
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tomberek
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| virtual std::pair<Value *, PosIdx> toValue(EvalState & state) | ||
| { | ||
| throw Error("argument '%s' cannot be evaluated", what()); | ||
| } |
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notes: this is the main motivation, remove default implementation of an error
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These methods would previously fail on the other `Installable`s, so moving them to this class is more correct as to where they actually work. Additionally, a `InstallableValueCommand` is created to make it easier (or rather no worse than before) to write commands that just work on `InstallableValue`s. Besides being a cleanup to avoid failing default methods, this gets us closer to NixOS/rfcs#134.
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Motivation
These methods would previously fail on the other
Installables, so moving them to this class is more correct as to where they actually work.Additionally, a
InstallableValueCommandis created to make it easier (or rather no worse than before) to write commands that just work onInstallableValues.Context
Besides being a cleanup to avoid failing default methods, this gets us closer to NixOS/rfcs#134.
Depends on #7750Checklist for maintainers
Maintainers: tick if completed or explain if not relevant
tests/**.shsrc/*/teststests/nixos/*