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Macros -> declarations
- To: common-lisp@sail
- Subject: Macros -> declarations
- From: Guy Steele <gls%AQUINAS@THINK.ARPA>
- Date: Mon, 06 May 1985 15:43:00 -0000
- Cc: gls%AQUINAS@THINK.ARPA
I would be not at all unhappy if this feature were to go away.
I agree that Scott's assessment that it is unlikely that any
existing code (outside of diagnostic tests for this very feature)
would be harmed.
I am persuaded not at all by the argument that it is hard to implement.
I am mildly swayed by the efficiency considerations for the interpreter.
The convincing point to me, however, is that the facility is likely
to confuse macro-writers (who do, indeed, frequently find it necessary
to find the division point between declarations/documentation and body).
As a proposal separate from the question of eliminating the expansion
of macros into declarations, I suggest the following primitive
The list is treated as a body (a list of forms) that may have declarations
and a documentation string at its head.
Three values are returned. The first is some tail of the list,
the executable part of the body. The second value is a list
of declarations (lists whose car is DECLARE) at the head of the body.
The third value is the documentation string, or NIL if there was
no documentation string.