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@@ -4332,6 +4332,10 @@ substitutes are genuine (@pxref{Substitutes}), or whether the build result
of a package is deterministic. @xref{Invoking guix challenge}, for more
background information and tools.
+When used in conjunction with @option{--keep-failed}, the differing
+output is kept in the store, under @file{/gnu/store/@dots{}-check}.
+This makes it easy to look for differences between the two results.
+
@item --derivations
@itemx -d
Return the derivation paths, not the output paths, of the given