Recheck path validity after acquiring lock
It might have changed, and in any event this is how the cod used to work so let's just keep it.
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@ -1547,6 +1547,7 @@ void DerivationGoal::tryToBuild()
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omitted, but that would be less efficient.) Note that since we
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now hold the locks on the output paths, no other process can
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build this derivation, so no further checks are necessary. */
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checkPathValidity();
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bool allValid = true;
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for (auto & [_, status] : initialOutputs) {
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if (!status.wanted) continue;
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