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bug#31676: 27.0.50; More helpful error message for unescaped character l


From: Noam Postavsky
Subject: bug#31676: 27.0.50; More helpful error message for unescaped character literals
Date: Fri, 19 Apr 2019 07:43:47 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux)

Philipp Stephani <address@hidden> writes:

>> > The function uses an uninterned variable, so it has to be in C. I think 
>> > that's slightly better than interning the
>> > variable and having some Lisp function access it (the latter would have 
>> > one additional internal symbol).

>> Why does it need an uninterned variable?
>
> It doesn't need to be uninterned, but it's cleaner that way because no
> other code can access the variable.
>
>>  And if it does, why cannot
>> it create a symbol that is not in obarray?
>
> That's what the patch does.

The patch uninterns a symbol after it's interned in the obarray.  I
think the question is, why put the symbol in the obarray in the first
place?  Just a C static variable would do (although this would require
an additional (trivial) C function, to use with record_unwind_protect
instead of specbind).  See for example Vloads_in_progress.






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