[plt-scheme] Resetting the mzscheme environment

Rohan Nicholls skrev:

> Is the enter! so new, that it is not in the docs yet?  Because I
> cannot find it, not that it matters now.

The first page of the guide has in bold letters (but nevertheless
easy to miss):

     This guide describes a potential future version of PLT Scheme.
     It does not match the current implementation.

-- 
Jens Axel Søgaard