"Unlike .local variables, the order and placement of the declarations matters. To a certain degree, Parrot’s default argument passing is positional. That is, it works like you expect; the first PMC parameter in the list at the point of the call is the first one you get in the parameter list. Interestingly, order matters only within a register set. These two parameter lists are equivalent: .param int count .param pmc item_to_repeat ... .param pmc item_to_repeat .param int count" ------------------------- I find the above a little confusing, if the default argument passing is positional, then surely the lists are not equivalent. Maybe I miss the contextual meaning of "order matters only within a register set". »