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This is what we previously did with ‘my-hello’. With the Scheme basics we’ve covered, we are now able to explain the leading chunks. As stated in guix package --help:

  -f, --install-from-file=FILE
                         install the package that the code within FILE
                         evaluates to

Thus the last expression must return a package, which is the case in our earlier example.

The use-modules expression tells which of the modules we need in the file. Modules are a collection of values and procedures. They are commonly called “libraries” or “packages” in other programming languages.