Preserve syntax tables in perform define-op
ASDF 3.3.0 introduced an unwanted discrepancy from 3.2.1, whereby the readtable and print-pprint-dispatch table were not preserved while loading a .asd file, which caused bad libraries like puri to try to corrupt the standard readtable when loaded as defsystem-depends-on dependency or equivalent. See bug report on the asdf-devel mailing-list. The real solution is to redo the syntax-control branch.
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