Use derivation output name from toDerivation #4515
Merged
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This fixes an issue where derivations with a primary output that is
not "out" would fail with:
This happens because while derivations produce every output when
built, you might not have them if you didn't build the derivation
yourself (for instance, the store path was fetch from a binary cache).
This uses outputName provided from DerivationInfo which appears to
match the first output of the derivation.