On Fri, May 02, 2008 at 02:16:01AM -0500, Patrick R. Michaud wrote: > > When you try to invoke a sub that doesn't exist, Parrot currently gives the > > unhelpful error message "Null PMC access in invoke()". Sometimes you can > > figure out what's wrong given the backtrace. Often you can't. > > ... > > The attached patch -- for discussion only -- adds an experimental op which > > performs the lookup and throws an exception if the sub is PMCNULL. Nothing > > else uses this op, and it doesn't perturb the existing find_name op, which > > is > > important. > > I'd like to see this patch or something like it applied relatively > soon. If it's not likely to happen within the next week or so, then > I'll go ahead with my plan to resolve the issue from within PCT until > Parrot does have a good solution.
The PCT-based solution is now implemented in r27351. In particular, when running a PCT-based language such as NQP or Rakudo (perl6), a statement like foo(1); now throws an exception saying "Cannot invoke non-existent sub 'foo'" instead of "Null PMC in invoke". Pm