[m-dev.] for review: make I/O predicates throw exceptions

[Fergus Henderson]

Well, it passed bootcheck, and I didn't get any complaints so far ;-),
so I'll go ahead and commit this one.  Hopefully Mission Critical
will be happy.

On 16-Sep-1999, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> library/io.m:
> 	Ensure that I/O operations that fail throw an exception rather
> 	than aborting execution.
> 
> 	Also declare io__putenv and io__getenv as impure and semipure
> 	respectively.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3        |     -- the last words of T. S. Garp.
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