[racket] Behaviour with read-only files

On Nov 17, 2011, at 10:53 AM, Matthias Felleisen wrote:

> 
> On Nov 17, 2011, at 1:47 PM, John Clements wrote:
> 
>> Suppose you run a big-bang program that puts a dot on the screen every time you press a key.  Now suppose it runs for 1K steps and halts. The user sees that the window is frozen, but probably won't figure out that the way to un-freeze it is to go to the stepper window and advance past the end of the currently-computed steps.
> 
> Perhaps 'universe' should have a 'stepper' entry point so that it can signal to programmers that it is waiting for stepper input. -- Matthias

This sounds complicated (for you and me to implement). What would the user see?

John

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4624 bytes
Desc: not available
URL: <http://lists.racket-lang.org/users/archive/attachments/20111117/7e3aca8c/attachment.p7s>