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Major revision for error handling in the interpreter

From: John W. Eaton
Subject: Major revision for error handling in the interpreter
Date: Fri, 4 Oct 2019 13:49:23 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0

With the changeset


the "error" function (and similar functions that ultimately call it), simply throws an exception that contains information about the error (message, id, stack info) instead of printing an error message immediately and then throwing an exception.

It is now the responsibility of any code that catches an execution exception to determine whether and when to display error messages. I believe that I have made all the necessary changes so that errors are still displayed where they should be, but I may have missed something. If you notice that error messages are not displayed correctly, please submit a bug report for the problem.

The new approach is more flexible and allows for some simplification of the error message routines as they no longer need feedback from the interpreter to know when to display or buffer messages.


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