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// make sure $concat doesn't optimize constants to the end
c = db.c;
c.drop();
c.save( { x:'3' } );
project = { $project:{ a:{ $concat:[ '1', { $concat:[ 'foo', '$x', 'bar' ] }, '2' ] } } };
assert.eq( '1foo3bar2', c.aggregate( project ).toArray()[ 0 ].a );
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