If somebody could help debugging this, it would be great...

(it would already be very helpful to know exactly which implementation of eval
is called in the end...)

Martin

(1) -> y := operator 'y

   (1)  y
                                                          Type: BasicOperator
(2) -> deq := differentiate(y x, x) + y x

         ,
   (2)  y (x) + y(x)

                                                    Type: Expression(Integer)
(3) -> res := first(solve(deq, y, x).basis)

          - x
   (3)  %e
                                                    Type: Expression(Integer)
(4) -> eval(deq, y, x+->res)

          - x
   (4)  %e
                                                    Type: Expression(Integer)



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