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bug#14164: letrec: detect illegal accesses to vars before entering body

From: Ludovic Courtès
Subject: bug#14164: letrec: detect illegal accesses to vars before entering body
Date: Fri, 12 Apr 2013 10:43:08 +0200
User-agent: Gnus/5.130005 (Ma Gnus v0.5) Emacs/24.3 (gnu/linux) 
Mark H Weaver <address@hidden> skribis:

>  @lisp
>  (letrec ((a 42)
> -         (b (+ a 10)))
> +         (b (+ a 10)))  ;; Illegal access
>    (* a b))

Please change it to “invalid access”.  Nothing illegal here.  ;-)

Ludo’.
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