It is a named let, details here:
http://www.ccs.neu.edu/home/dorai/t-y-scheme/t-y-scheme-Z-H-1.html#node_toc_node_sec_6.2

-Dan
On 16 Dec 2014 13:58, "Bahman Movaqar" <bah...@bahmanm.com> wrote:

> Reading on "lazy-seq" [1]; what exactly does the following piece of code
> do?
>
>     (let foo ((x 10))
>       (* x x))
>
> TIA,
>
> [1] http://wiki.call-cc.org/eggref/4/lazy-seq
>
> --
> Bahman Movaqar
>
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