[plt-scheme] member in teaching languages

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Fri Oct 28 19:37:06 EDT 2005

On Oct 28, 2005, at 7:32 PM, Prabhakar Ragde wrote:

> (member 'B '(B A C)) returns '(B A C) in Intermediate Student with 
> Lambda in up to and including 299.27. My next installed version is 
> 299.100, and from then on, it returns true. Personally, I think that 
> true is easier for students to deal with, but the documentation does 
> not reflect this change; it still claims that member returns (union 
> false list). The change broke my solutions from last year; it must 
> have broken what other people have done, so I am a little surprised 
> that I have not heard of it before. --PR

We don't recommend using 299.400 in schools yet. -- Matthias

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