On Thu, Nov 13, 2008 at 03:21:45PM -0800, Carl Mäsak wrote:
> Rakudo r32629 sometimes dies when assigning a readonly variable to
> itself, and sometimes not.
>
> $ ./perl6 -e 'for <a b c> -> $foo { $foo = $foo; say $foo }' # dies, good
> Cannot assign to readonly variable.
> [...]
>
> $ ./perl6 -e 'for split(/<sp>/, "a b c") -> $foo { $foo = $foo; say
> $foo }' # baaaahd!
> a
> b
> c
There's a bit more going on behind the scenes here -- the "$foo = $foo"
line in the second case is also promoting Parrot String values into
Rakudo Str objects. I suspect that promotion is causing the
readonly property on $foo to be lost.
My guess is that we want to adjust Parrot's C<copy> opcode so that
it doesn't modify the destination PMC's properties.
Thanks,
Pm
