Package: pariVersion: 2.6.2 (development 16006-f55c8ae)
There is no garbage collection inside products, but it is easy
to reach the stack limit.
gp> vector(500,k,'x^k)*vectorv(500,k,'y^k)
*** at top-level: vector(500,k,'x^k)*vectorv(500,k,'y^k)
*** ^--------------------
*** _*_: the PARI stack overflows !
current stack size: 8000000 (7.629 Mbytes)
[hint] you can increase GP stack with allocatemem()
*** Break loop: type 'break' to go back to GP prompt
break>