Strange behavior of macro

[Herbert Euler]

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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