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From: Ralph.Hyre@C.CS.CMU.EDU (Ralph W. Hyre Jr.)
Newsgroups: net.lang.mod2
Subject: Re: Exceptions in Modula-2
Message-ID: <12180441796.29.RALPHW@C.CS.CMU.EDU>
Date: Mon, 3-Feb-86 11:45:08 EST
Article-I.D.: C.12180441796.29.RALPHW
Posted: Mon Feb  3 11:45:08 1986
Date-Received: Wed, 5-Feb-86 02:47:48 EST
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Only major problem I have with the proposal is the use of strings rather than
integers.  I'd like to see integer error code numbers and string comments.
This allows the programmer maximum flexibility in interpreting the error
in the appropriate context.

The CLU language has something similar (better, in my opinion) to this,
exceptions have names and optional parameters, so that a routine to read
from an open file can return the error not_possible("protection violation")
or not_possible ("end_of_file").  With this proposal, the only thing that
might need to be standardized are the exception numbers.

					- Ralph
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