Re: Fix a C++ parser error message (PR c++/9851)

[Mark Mitchell <mark at codesourcery dot com>]

> That's arguably a little bit too late, though, since we will have
> already issued this error:
>    foo.cc:6: error: `do_nothing' has not been declared
> That error is issued by the call to cp_parser_type_name().
>
>  
That doesn't bother me.  I think that's an OK message.

One can spend forever optimizing error messages, but the most important 
thing is not to be totally stupid.  I'd say that if we just issued that 
error message and nothing else, we'd be doing fine.  If we also issued a 
follow-on message that said "perhaps you should have used -> instead of 
." we'd be doing great.

> I don't yet see a good way to avoid the error message without doing a
> tentative parse.
>  
Tentative parsing is expensive so we want to avoid it where we can.

--
Mark Mitchell
CodeSourcery, LLC
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mark@codesourcery.com