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error:
       … while calling the 'addDrvOutputDependencies' builtin
         at /pwd/in.nix:9:4:
            8|
            9| in builtins.addDrvOutputDependencies drv.outPath
             |    ^
           10|

       error: `addDrvOutputDependencies` can only act on derivations, not on a derivation output such as 'out'