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Re: Proposal #13: Structure Sharing in Arguments

In article <FAHLMAN.12225845128.BABYL@C.CS.CMU.EDU> Fahlman@C.CS.CMU.EDU (Scott E. Fahlman) writes:

>We are then left with something like Guy's rule: In general, it is not
>safe to do destructive operations on a list unless you know where it
>came from and who else might be holding on to it.

We teach our students this already, although most textbooks seem to have
only a token warning against it.  Perhaps the new standard should print
this in red with purple polka-dots?