/usr/share/doc/cl-asdf/examples/test-modules-serial.asd is in cl-asdf 2:3.1.7-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | ;;; -*- Lisp -*-
(asdf:defsystem test-modules-serial
:serial t
:components
((:module "a"
:serial t
:pathname "."
:components
((:file "file1")
(:file "file2")))
(:module "b"
:pathname "b"
:components
((:file "file3")))))
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