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))
Yes, I know. I should have said "I find the error message
confusing and wish it explained more, especially for ASL."
-- Matthias, too busy to write reasonable emails.
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