# New Ticket Created by Ben Noordhuis # Please include the string: [perl #126395] # in the subject line of all future correspondence about this issue. # <URL: https://rt.perl.org/Ticket/Display.html?id=126395 >
$ perl6 --version This is perl6 version 2015.09-419-gfae01fb built on MoarVM version 2015.09-79-gee9fc2b $ perl6 -e 'my @a := (); @a[0] := ()' # hangs, no output It doesn't seem to matter what @a or @a[0] are bound to, e.g. `my @a := <a b c>; @a[0] := 42` behaves the same. I see the same behavior at every --optimize level and when := is replaced with ::=. `perf top` reports that the process spends ~60% of its time in MVM_gc_root_add_frame_roots_to_worklist. RSS grows by 10s of MB/second. Guesswork but I suspect it's some kind of cycle? Apologies if this has been reported before. A search of the bug tracker didn't turn up anything that looked like this issue.
