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// do not allow creation of fields with a $ prefix
load('jstests/aggregation/extras/utils.js');
c = db.c;
c.drop();
c.insert({a: 1});
// assert that we get the proper error in both $project and $group
assertErrorCode(c, {$project: {$a: "$a"}}, 16404);
assertErrorCode(c, {$project: {a: {$b: "$a"}}}, 15999);
assertErrorCode(c, {$project: {a: {"$b": "$a"}}}, 15999);
assertErrorCode(c, {$project: {'a.$b': "$a"}}, 16410);
assertErrorCode(c, {$group: {_id: "$_id", $a: "$a"}}, 15950);
assertErrorCode(c, {$group: {_id: {$a: "$a"}}}, 15999);
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