File: server6194.js

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mongodb 1%3A3.2.11-2%2Bdeb9u1
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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);