REQUIRE now searches for ASDF systems.
If ASDF is loaded via (REQUIRE 'ASDF), all subsequent invocations of REQUIRE will search for a loadable ASDF system definitions if the default resolver mechanism fails. SYS::*MODULE-PROVIDER-FUNCTIONS* now contains a customizable list of module provider functions. Such a function takes a single argument of the module that should be resolved and loaded. There is a builtin resolver #'SYS::MODULE-PROVIDE-SYSTEM that implicitly called before any functions in this variable.
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