text: // Check key match with sub matchers - part of SERVER-3192
  
  t = db.jstests_and3;
  t.drop();
  
  t.save( {a:1} );
  t.save( {a:'foo'} );
  
  t.ensureIndex( {a:1} );
  
  function checkScanMatch( query, nscannedObjects, n ) {
   	var e = t.find( query ).hint( {a:1} ).explain();
      assert.eq( nscannedObjects, e.nscannedObjects );
      assert.eq( n, e.n );
  }
  
  checkScanMatch( {a:/o/}, 1, 1 );
  checkScanMatch( {a:/a/}, 0, 0 );
  checkScanMatch( {a:{$not:/o/}}, 2, 1 );
  checkScanMatch( {a:{$not:/a/}}, 2, 2 );
  
  checkScanMatch( {$and:[{a:/o/}]}, 1, 1 );
  checkScanMatch( {$and:[{a:/a/}]}, 0, 0 );
  checkScanMatch( {$and:[{a:{$not:/o/}}]}, 2, 1 );
  checkScanMatch( {$and:[{a:{$not:/a/}}]}, 2, 2 );
  checkScanMatch( {$and:[{a:/o/},{a:{$not:/o/}}]}, 1, 0 );
  checkScanMatch( {$and:[{a:/o/},{a:{$not:/a/}}]}, 1, 1 );
  checkScanMatch( {$or:[{a:/o/}]}, 1, 1 );
  checkScanMatch( {$or:[{a:/a/}]}, 0, 0 );
  checkScanMatch( {$nor:[{a:/o/}]}, 2, 1 );
  checkScanMatch( {$nor:[{a:/a/}]}, 2, 2 );
  
  checkScanMatch( {$and:[{$and:[{a:/o/}]}]}, 1, 1 );
  checkScanMatch( {$and:[{$and:[{a:/a/}]}]}, 0, 0 );
  checkScanMatch( {$and:[{$and:[{a:{$not:/o/}}]}]}, 2, 1 );
  checkScanMatch( {$and:[{$and:[{a:{$not:/a/}}]}]}, 2, 2 );
  checkScanMatch( {$and:[{$or:[{a:/o/}]}]}, 1, 1 );
  checkScanMatch( {$and:[{$or:[{a:/a/}]}]}, 0, 0 );
  checkScanMatch( {$or:[{a:{$not:/o/}}]}, 2, 1 );
  checkScanMatch( {$and:[{$or:[{a:{$not:/o/}}]}]}, 2, 1 );
  checkScanMatch( {$and:[{$or:[{a:{$not:/a/}}]}]}, 2, 2 );
  checkScanMatch( {$and:[{$nor:[{a:/o/}]}]}, 2, 1 );
  checkScanMatch( {$and:[{$nor:[{a:/a/}]}]}, 2, 2 );
  
  checkScanMatch( {$where:'this.a==1'}, 2, 1 );
  checkScanMatch( {$and:[{$where:'this.a==1'}]}, 2, 1 );
  
  checkScanMatch( {a:1,$where:'this.a==1'}, 1, 1 );
  checkScanMatch( {a:1,$and:[{$where:'this.a==1'}]}, 1, 1 );
  checkScanMatch( {$and:[{a:1},{$where:'this.a==1'}]}, 1, 1 );
  checkScanMatch( {$and:[{a:1,$where:'this.a==1'}]}, 1, 1 );
  checkScanMatch( {a:1,$and:[{a:1},{a:1,$where:'this.a==1'}]}, 1, 1 );
  
  function checkImpossibleMatch( query ) {
      var e = t.find( query ).explain();
      assert.eq( 0, e.n );
      // The explain output should include the indexBounds field.
      // The presence of the indexBounds field indicates that the
      // query can make use of an index.
      assert('indexBounds' in e, 'index bounds are missing');
  }
  
  // With a single key index, all bounds are utilized.
  assert.eq( [[1,1]], t.find( {$and:[{a:1}]} ).explain().indexBounds.a );
  assert.eq( [[1,1]], t.find( {a:1,$and:[{a:1}]} ).explain().indexBounds.a );
  checkImpossibleMatch( {a:1,$and:[{a:2}]} );
  checkImpossibleMatch( {$and:[{a:1},{a:2}]} );
  