// Uassert when $elemMatch is attempted within $in SERVER-3545

t = db.jstests_ina;
t.drop();
t.save( {} );

assert.throws( function() { t.find( {a:{$in:[{$elemMatch:{b:1}}]}} ).itcount(); } );
assert.throws( function() { t.find( {a:{$not:{$in:[{$elemMatch:{b:1}}]}}} ).itcount(); } );

assert.throws( function() { t.find( {a:{$nin:[{$elemMatch:{b:1}}]}} ).itcount(); } );
assert.throws( function() { t.find( {a:{$not:{$nin:[{$elemMatch:{b:1}}]}}} ).itcount(); } );

// NOTE Above we don't check cases like {b:2,$elemMatch:{b:3,4}} - generally
// we assume that the first key is $elemMatch if any key is, and validating
// every key is expensive in some cases.