parenthesis necessary for Plural-Forms

[Viktor Horvath]

Dear gettext maintainers,

I'm using gettext 0.17 to internationalise a Perl project. I found  
that plural forms would only work when I set the plurals= expression  
into parentheses. Specifically,

"Plural-Forms: nplurals=3; plural=n==0 ? 0 : (n==1 ? 1 : 2);n"

would not work as expected, but

"Plural-Forms: nplurals=3; plural=(n==0 ? 0 : (n==1 ? 1 : 2));n"

did the job.

In case you can verify this behaviour, maybe one could update the  
manual to reflect it? At the moment, it seems to suggest that the  
first line should work. If you want, I can try to provide a patch for  
the manual within some days.

Best wishes,
Viktor.

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