[perl #57078] return value from causes null PMC access

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
# Please include the string:  [perl #57078]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=57078 >


According to t/spec/S29-context/sleep.t (in the Pugs repo), you're
supposed to do this:

my $sleep_says = sleep 3;

but

$ ./perl6 -e 'sleep 3' # works
$ ./perl6 -e 'my $a = sleep 3;'
Null PMC access in can()
current instr.: 'parrot;Perl6Object;infix:=' pc 37 (src/gen_builtins.pir:45)
called from Sub '_block11' pc 36 (EVAL_11:16)
called from Sub 'parrot;PCT::HLLCompiler;eval' pc 806
(src/PCT/HLLCompiler.pir:481)
called from Sub 'parrot;PCT::HLLCompiler;command_line' pc 1305
(src/PCT/HLLCompiler.pir:708)
called from Sub 'parrot;Perl6::Compiler;main' pc 14346 (perl6.pir:172)
$