Testing ASDF found several bugs in ABCL.
cd ~/cl/asdf/
abcl --noinform --eval '(or`#.(load(string`|test/script-support.lisp|)`:verbose():print())#.(asdf-test::exit-lisp`0))' Failed to require LOOP because 'Illegal function object: (bqv).'
Maximum error depth exceeded (11 nested errors) with 'Illegal function object: (bqv).'.
abcl --noinform --eval "(or'#.(load(string'|test/script-support.lisp|):verbose():print())#.(asdf-test::exit-lisp'0))"
So your backquote parser is broken somehow.
Also, upgrading from ASDF 2.25 or 2.26 used to work, but not anymore. Now 2.27 is needed (as configured in header.lisp, and tested with make u l=abcl ASDF_UPGRADE_TEST_TAGS=2.25).
Finally, there are many instances of abcl in #+ or #- in the test/ directory, including two new ones in test-bundle on Mac (which is a regression from abcl 1.1.0) and in test-stamp-propagation (which is a new test, and a bug shared with XCL).
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