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From: "Herbert Euler" <herberteuler@hotmail.com>
Subject: Strange behavior of macro
Date: Tue, 30 May 2006 16:56:56 +0800	[thread overview]
Message-ID: <BAY112-F6041A897C6A278835FE51DA920@phx.gbl> (raw)

Hello,

Is the following in Emacs a expected behavior of macro?

    (defmacro m1 (v)
      (let ((len (length (eval v))))
        `(quote ,len)))
         => m1

    (m1 '(1 2 3))
         => 3

    (setq v1 '(1 2 3))
         => (1 2 3)

    (m1 v1)
         => 3

    (setq v v1)
         => (1 2 3)

    (m1 v)
         => error: (wrong-type-argument sequencep v)

Thanks.

Regards,
Guanpeng Xu

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             reply	other threads:[~2006-05-30  8:56 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-30  8:56 Herbert Euler [this message]
2006-05-30  9:34 ` Strange behavior of macro David Kastrup
2006-05-30 10:23 ` Andreas Schwab
2006-05-30 10:31   ` Herbert Euler
2006-05-30 10:35     ` Andreas Schwab

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