[perl #67992] [BUG] Null PMC Access when referring to attributes in roles used by classes which also have attributes in Rakudo

[jn...@jnthn.net via RT]

On Tue Jul 28 16:32:52 2009, masak wrote:
> <masak> rakudo: role A { has @!foo; method bar() { @!foo ~~ (1,2); }
> }; class B does A { has $.baz; }; B.new().bar()
> <p6eval> rakudo 6999e5: OUTPUT«Null PMC access in isa()␤in method
> A[]::bar [...]
> * masak submits rakudobug
> <masak> rakudo: role A { has @!foo; method bar() { say @!foo } };
> class B does A { has $.baz; }; B.new().bar()
> <p6eval> rakudo 6999e5: OUTPUT«Null PMC access in isa()␤in method
> A[]::bar [...]
> 
> I've been testing the phenomenon pretty extensively, and it doesn't
> seem to matter whether it's @!foo, $!foo or %!foo -- the error occurs
> in all those cases. Also doesn't matter if it's $.baz or $!baz.
> Removing $.baz entirely makes the error go away. Defining &bar in B
> instead of A also doesn't make any difference.

Fixed in git 6999e58 and test added to S14-role/attributes.t.

Thanks,

Jonathan