[Axiom-developer] System error: Cannot take first of an empty list

[Vladimir Bondarenko]

Hello all,

Any comments on the following stuff?


.......................................................
-- behavior type # 1
.......................................................

-> integrate(%i^log(z), z)

        log(%i)log(z)
    z %e
    -----------------
       log(%i) + 1

-> integrate(f^log(z), z)

        log(f)log(z)
    z %e
    ----------------
       log(f) + 1

-> integrate(sin^log(z), z)

        log(sin)log(z)
    z %e
    ------------------
       log(sin) + 1

-> integrate(tan^log(z), z)

        log(tan)log(z)
    z %e
    ------------------
       log(tan) + 1

-> integrate(sqrt^log(z), z)

        log(sqrt)log(z)
    z %e
    -------------------
       log(sqrt) + 1

-> integrate(atan^log(z), z)

        log(atan)log(z)
    z %e
    -------------------
       log(atan) + 1

-> integrate(asinh^log(z), z)

        log(asinh)log(z)
    z %e
    --------------------
       log(asinh) + 1
.......................................................


BUT


.......................................................
-- behavior type # 2
.......................................................

-> integrate(exp^log(z), z)

   >> System error:
   Cannot take first of an empty list

-> integrate(log^log(z), z)

   >> System error:
   Cannot take first of an empty list

.......................................................


Should this be considered as a bug or a feature?
   

Best,

Vladimir