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// SERVER-6181 Correctly support an expression for _id
c = db.c;
c.drop();
c.save( { a:2 } );
res = c.aggregate( { $project:{ _id:'$a' } } );
assert.eq(res.toArray(), [{_id:2}]);
res = c.aggregate( { $project:{ _id:{$add: [1, '$a']} } } );
assert.eq(res.toArray(), [{_id:3}]);
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