Output all differences between the compared derivations #7
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Before this change, if the set of input names to a derivation changed,
then the set of matching-names inputs was not compared.
This fixes the issue, allowing to use
nix-diff
as a tool for systemadministration: there, you have to know all the differences between the
two system derivations, not only until an input set has a mismatching
name (eg. a linux-kernel upgrade should not hide an nginx upgrade).
Fixes #5.