The segfault occurs inside clone_key_arg() inside src/inter_call.c (at
line 871), which has the following leading POD description (committed by
chromatic who also committed most of the implementation):
Replaces any src registers by their values (done inside clone). This
needs a test for tailcalls
# New Ticket Created by Patrick R. Michaud
# Please include the string: [perl #56448]
# in the subject line of all future correspondence about this issue.
# http://rt.perl.org/rt3/Ticket/Display.html?id=56448 >
Parrot segfaults when C functions invoke PIR functions that
perform tailcalls. He
