At 09:04 -0700 on 08/02/2006, Edward Jaffe wrote about Re: S99RBXLN
"Head's Up":
IATYREGS is not an exception. *All* JES3 macros allow repeated inclusion.
If I remember correctly, so do the JES2 mapping macros. IOW: As they
are expanded, they set a "I've been expanded/invoked" Global SETB
flag and will jump to the end of the macro when called more than once
(this handles the "expand all your prereqs" cases).
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