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The output from the current version of
:b
in the nix repl shows less information, so when the first derivation is built, the environment isn't printed to the screen. As a result, the purpose of puttingdeclare -xp
into the builder script is no longer clear.Therefore, I split the example into two parts 1) using a builder script that simply echoes "foo" to $out, and 2) a builder script that writes the environment to $out. I think this makes it easier for the user to follow the steps.