Better explain the ECL bug found by in test-xach-update-bug.script

;;; -*- Lisp -*-

(setf asdf/cache:*asdf-cache* nil) ;; disable cache between those two very different compilations.

;;(setf asdf::*load-system-operation* 'load-bundle-op) ;; This triggers a bug on ECL. See below.

(defparameter foo :test-asdf-location-change)

 (subpathname *test-directory* "xach-foo-2/b.lisp")

 (component-pathname (find-component foo2 "b")))

(DBG "load foo yet again. It should see the pathname has changed and load it anew")

;;; ECL bug: this fails if we use load-fasl-op instead of load-op:

;;; the test-asdf-location-change.fasb is linked and loaded,

;;; but that fails to create the :second-version package;

;;; loading the same .fasb in another ecl works fine, and defined (second-version:wtf). WTF?

;;; Test it by replacing load-op below by load-bundle-op, and trace load* and other functions.

(operate 'load-op foo)

;;; ECL bug: this fails if we use load-bundle-op instead of load-op as *load-system-operation*

;;; in bundle.lisp. The test-asdf-location-change.fasb is linked and loaded, but that fails to

;;; create the :second-version package; loading the same .fasb in another ecl works fine, and

;;; defines (second-version:wtf). WTF? You can test this bug by uncommenting the

;;; (setf asdf::*load-system-operation* 'load-bundle-op) line at the beginning of this file.

;;; NB: works on MKCL.

(load-system foo)

(assert (symbol-value (find-symbol* :loaded :second-version)))

(assert-equal 42 (symbol-call :second-version :wtf))