substitute: 
substitute: updating substitutes from 'https://mirror.hydra.gnu.org'...   0.0%
substitute: updating substitutes from 'https://mirror.hydra.gnu.org'...  33.3%
substitute: updating substitutes from 'https://mirror.hydra.gnu.org'...  66.7%
substitute: updating substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
The following derivations would be built:
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395.9 MB would be downloaded:
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