[perl #75718] [BUG] Null PMC access when smartmatching on a subtype of Hash in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
# Please include the string:  [perl #75718]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=75718 >


<masak> rakudo: subset A of Hash; sub foo(A $x) {}; foo {}
<p6eval> rakudo bdbdfb: OUTPUT«Null PMC access in invoke()␤  in
'ACCEPTS' at line 1␤  in 'foo' at line 1:/tmp/e7jYXh7FK8␤  in 'foo' at
line 11:/tmp/e7jYXh7FK8␤  in main program body at line
11:/tmp/e7jYXh7FK8␤»
* masak submits rakudobug
<masak> rakudo: sub foo($x where Hash) {}; foo {}; say "alive"
<p6eval> rakudo bdbdfb: OUTPUT«alive␤»
<masak> rakudo: subset A of Hash; say {} ~~ A
<p6eval> rakudo bdbdfb: OUTPUT«Null PMC access in invoke() [...]
<masak> ah. there it is.