Load named-readtables, define put reader macros in the table when defined
Make antik-base dependent on named-readtables and define the table as a copy of the standard table. Then in each system where the three reader functions are defined, set-dispatch-macro-character into the :antik readtable immediately after the function definition. This way, each reader macro is available as soon as the underlying definitions have been made. For the test files that use reader macros, put the necessary form (named-readtables:in-readtable :antik) just below the in-package form.