[plt-scheme] Disabling contract checking

See that's why we want examples of where contracts are too much 
overhead. -- Matthias :-)

On Apr 11, 2006, at 8:22 AM, Geoffrey Knauth wrote:

> On Apr 10, 2006, at 14:52, Matthias Felleisen wrote (quoting Hoare):
>> Imagine yourself learning how to run an ocean-going sail-boat.
>> Of course, you start with exercises on land. You wear your
>> life vest, too. When you're ready, you take the sailboat out
>> on the ocean, and to avoid the weight, you leave the life
>> vests behind on land. That's what it means to run code with
>> contracts [he said "assertions"] turned off.
>
> This is a great image.  Something similar happened in rowing.  10-15 
> years ago, British authorities ruled that coxswains had to wear life 
> vests.  In the U.S., we laughed.  U.K. coxswains complained the vests 
> were too bulky.  The market responded with lightweight non-bulky vests 
> that erased most objections.  The new vests work well enough that 
> rowers too use them now for added safety when the water is dangerously 
> cold (late winter & early spring), saving lives worldwide.
>
> Geoffrey
> --
> Geoffrey S. Knauth | http://knauth.org/gsk
>
>
>