[plt-scheme] about letrec and continuation : which behavior is correct ? and why ?

Matthias Felleisen wrote:
>
> I assume w/ "incorrect" you mean "is not a legal program".
>
> It never ceases to amaze me that the Report specifies that some
> syntactically legal expressions are NOT programs but you can only
> find out (as far as I know) that they are NOT programs by RUNNING
> them. (Of course all this means is that compilers and interpreters
> accept and deal with 'things' that are not legal programs in the
> spirit of a report, though I can't think of another language with
> this property.)
>

Being a dynamic-typed language, a lot of syntactically legal expression 
are not programs.

> -- Matthias
>
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