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Files containing defsystem
forms
are regular Lisp files that are executed by load
.
Consequently, you can put whatever Lisp code you like into these files
(e.g., code that examines the compile-time environment
and adds appropriate features to *features*
).
However, some conventions should be followed,
so that users can control certain details of execution
of the Lisp in .asd files:
*standard-output*
,
so that users can easily control the disposition
of output from ASDF operations.