const coll = db[jsTestName()];
coll.drop();

assert.commandWorked(coll.insert({_id: 1, x: 1}));

/*
 * Tests that the server doesn't crash when you group by a system variable.
 * Reproduces SERVER-57164.
 */
function testAggWithSystemVariable(varName, explain) {
    try {
        // This query might or might not throw depending on the engine used
        // and whether the variable is defined.
        if (explain) {
            coll.explain().aggregate({$group: {_id: varName}});
        } else {
            coll.aggregate({$group: {_id: varName}});
        }
    } catch (e) {
    } finally {
        // Make sure the server didn't crash.
        db.hello();
    }
}

testAggWithSystemVariable("$$IS_MR", true);
testAggWithSystemVariable("$$JS_SCOPE", true);
testAggWithSystemVariable("$$CLUSTER_TIME", true);
testAggWithSystemVariable("$$IS_MR");
testAggWithSystemVariable("$$JS_SCOPE");
testAggWithSystemVariable("$$CLUSTER_TIME");