[Ecls-list] define-modify-macro and let+ problem

[Tara Lorenz]

Hello list,

while trying to get cl-num-utils running on ECL i encountered a problem
with let-plus in combination with define-modify-macro.  

Informal description: When define-modify-macro defines a three-argument
"modifier", ECL complains about  "wrong number of arguments" when used in
combination with let-plus and structure slots.  I see no problems when
used outside of let-plus.  I also see no problems when i use a two
argument modifier.

I attached an hopefullly illustrating sample.  This runs fine on SBCL
and CLISP but produces the aforementioned error when run under ECL
(both, recent release and current git head).

So, please, can anybody give me a hint how to do it right.

Cheers, Tara
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