* Change extension .store' to .drv'.

* Re-enable `nix-store --query --requisites'.

src/libstore/normalise.cc

@@ -1307,6 +1307,9 @@ void SubstitutionGoal::init()
         return;
     }
 
+    /* !!! build the outgoing references of this path first to
+       maintain the closure invariant! */
+
     /* Otherwise, get the substitutes. */
     subs = querySubstitutes(storePath);