Alex Shinn scripsit:

> Using letrec as though it were letrec* is indeed a bug.  Specifically,
> it "is an error", which means implementations are free to handle this
> situation however they want, including raising an exception or simply
> treating it as letrec*.

Yes, that's true (though not true in R6RS, where sequential dependency in
letrec must signal an error).  Besides the R6RS implementations, only MIT,
Scheme48/scsh, SigScheme, and TinyScheme do not handle letrec as letrec*,
though SISC prints a warning.  Only Scheme48/scsh and SigScheme get upset
by sequential dependencies in internal defines (following R5RS strictly).

--
I don't know half of you half as well           John Cowan
as I should like, and I like less than half     cowan@ccil.org
of you half as well as you deserve.             http://www.ccil.org/~cowan
        --Bilbo

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