[Bug 218943] /bin/sh regression? with doubly negated numbers

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218943

John Hein <z7dr6ut7gs at snkmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
         Resolution|---                         |Works As Intended

--- Comment #2 from John Hein <z7dr6ut7gs at snkmail.com> ---
I see.

Not that bash is necessarily a good model to follow, but it supports the --/++
operators and is able to distinguish between the context when it's an operator
and a double negation.

% bash -c 'var=--123; echo $(($var)); echo $((--var))'
123
122
% bash -c 'echo $((--123))'
123

Same with/without POSIXLY_CORRECT.

But thanks for the explanation.  Closing this as 'works as intended'.  I guess
sh(1) could be enhanced to distinguish - from context - between the operator
and a double negation (and only throw the error for the former case).  I'm sure
it's quite tricky.

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