[plt-scheme] ignoring metadata

Robby Findler wrote:
> You can do (read-line) three times and throw away the results (but
> there may be a different number of lines in some future version
> (hopefully not ...) so I'd suggest doing some checking, like looking
> for ";" at the start of the first two and "#reader" at the start of
> the third).

I was hoping to avoid that, because I don't know for sure if the file 
will have the metadata or not. I can't create a "no-op" reader of some 
sort? --PR