On Thu, Jul 17, 2008 at 8:47 AM, Torsten Foertsch
<torsten.foertsch@[...].net>  wrote:And, to actually answer some of your questions:

>  And how can I know in XS if a variable should not be modified? The READONLY
>  flag is not set on $1 but is set on $^V

You have to do the equivalent of eval { $var = "foo" } as you'd need
to do with any tied $var that has a STORE method, whether it's
implemented in core, XS, or Pure-Perl.

>  although both are documented as read-only.

If capture variables are documented as READONLY somewhere that's a
bug, what documentation are you referring to?