[plt-dev] reader

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Tue Mar 23 19:06:55 EDT 2010

p.s. Can I have a "read-ignore-meta-info" parameter please? pretty please? 

On Mar 23, 2010, at 5:40 PM, Matthew Flatt wrote:

> At Tue, 23 Mar 2010 17:13:42 -0400, Matthias Felleisen wrote:
>> Save the program below
> As "foo.ss", I assume...
>> and run. See surprising error message. Change  
>> language to #lang scheme and see same surprising error message. Why?
> When you call `read', you generally don't expect arbitrary code to run.
> Since `#reader' and `#lang' can make the reader load arbitrary code,
> they're disabled by default. (They're specifically enabled for reading
> code via `require' or `load'.)
> To allow `read' on a module source, parameterize `read-accept-reader',
> as in this "foo.ss":
>  #lang scheme
>  (parameterize ([read-accept-reader #t])
>    (with-input-from-file "foo.ss" read))

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