Re: Why should interactive search results raise errors?

[Richard Stallman]

    I still believe that interactive search commands should not raise 
    errors. However I think adding these commands now to 
    debug-ingnored-errors is the better solution now. Could we please do 
    that now?

I see no reason to change this.  Lots of commands signal errors when
they can't do what they are asked to do; why shouldn't these?

    I think the better answer is to create a new error class called `user-error'
    which would be then added to debug-ignored-errors.  Then we can replace most
    elements of debug-ignored-errors by changing the signalling code so as to
    signal a `user-error' rather than an `error'.

That is not necessarily a bad idea, but I am not sure whether it is
really possible to distinguish "user errors" from other errors at the
level of calls to `signal'.

`debug-ignored-errors' does make an attempt to distinguish which
errors are _probably_ user errors, but it cannot really know,
and sometimes this criterion gets the wrong answer.