[racket] Behaviour with read-only files

From: John Clements (clements at brinckerhoff.org)
Date: Thu Nov 17 13:56:13 EST 2011

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?


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