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re: There seems to be nothing in CLtL that answers the question:
"is x a legal type specifier?"
At the meeting that founded the X3J13 committee (on 6-Dec-85), Guy Steele
circulated a list of "non-controversial issues" and "Clarifications"
which included the following addition [typos faithfully reproduced]:
"(*) 51 Add a newefunction TYPE-SPECIFIER-P that is true of valid type
specifiers and fals of all other Lisp objects. Note that the use of
DEFSTRUCT and DEFTYPE can change the behavior of TYPE-SPECIFIER-P over
Sad to say, this and many other "non-controversial" items included in
Guy's list of "Clarifications", has never been brought up in the X3J13
"Cleanup" subcommittee. However, Lucid's 3.0 release includes such
-- JonL --