[bug-gawk] pretty-print eats parentheses

[Hermann Peifer]

Hi Arnold and others,

Below a small observation which I made while trying to construct a 
string consisting of negative integers with FS in between.

I'm on gawk from git, on OSX 10.10.

Regards, Hermann

PS: I had a feeling of "déjà vu", but this historical issue was slightly 
different: 
http://lists.gnu.org/archive/html/bug-gnu-utils/2009-08/msg00018.html

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# Does not work as I expected..
$ gawk 'BEGIN{FS="|"; str = -8 FS -9 ; print str}'
-8-9

# ..but this does
$ gawk 'BEGIN{FS="|"; str = -8 FS (-9) ; print str}'
-8|-9

# My parentheses are gone :-(
$ gawk -o/dev/stdout 'BEGIN{FS="|"; str = -8 FS (-9) ; print str}'
BEGIN {
        FS = "|"
        str = -8 FS -9
        print str
}