question: private static InvocationConstraint [ ] concat ( InvocationConstraint [ ] arr1 , InvocationConstraint [ ] arr2 ) { InvocationConstraint [ ] res = new InvocationConstraint [ arr1 . length + arr2 . length ] ; System . arraycopy ( arr1 , 0 , res , 0 , arr1 . length ) ; System . arraycopy ( arr2 , 0 , res , arr1 . length , arr2 . length ) ; return res ; }
target:  Returns a new array containing the elements of both arguments.