K 10
svn:author
V 6
jilles
K 8
svn:date
V 27
2013-08-24T20:06:00.105540Z
K 7
svn:log
V 300
sh: Reject ++ and -- in arithmetic.

POSIX does not require ++ and -- in arithmetic. It is probably more useful
to reject them than to treat ++x and --x as x silently.

Note that the behaviour of increment and decrement can be obtained via
(x+=1), ((x+=1)-1), (x-=1) and ((x-=1)+1).

PR:		bin/176444

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