By including `@filename@` in the enums/errors types header template, we
generate files containing the full path to source files, which reflects
the particular filesystem layout used for a given build. As such, this
alters build reproducibility as it causes a (admittedly small) diff
between builds executed in different environments.
Using `@basename@` instead ensures only the file name (without its full
path) is mentioned in the generated files, making the builds
reproducible again.
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