It's better to signal an error on R7RS syntax-rules when it couldn't build output

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Issue #151 resolved
Takashi Kato repo owner created an issue

This type of macro should raise an error the same as R6RS.

(import (scheme base))
(define-syntax zipm
  (syntax-rules ()
    ((_ (x ...) (y ...))
     (list '(x y) ...))))
(zipm (1 2 3) (1 2 3 4))

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