‘basicDrv.inputSrcs’ also contains the outputs of inputDrvs. These don't necessarily exist in the local store, so copying them may cause an exception. We should only copy the real inputSrcs.
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copyClosure(ref<Store>(localStore), destStore, basicDrv.inputSrcs);
copyClosure(ref<Store>(localStore), destStore, step->drv.inputSrcs);