Larry Wall wrote in perl.perl6.language :
> On Wed, Dec 17, 2003 at 12:11:59AM +0000, Piers Cawley wrote:
>: When you say CHECK time, do you mean there'll be a CHECK phase for
>: code that gets required at run time?
> 
> Dunno about that.  When I say CHECK time I'm primarily referring
> to the end of the main compilation.  Perl 5 appears to ignore CHECK
> blocks declared at run time, so in the absence of other considerations
> I suspect Perl 6 might do the same.

This has proven to be inconvenient except for a few specialized usages,
such as the B::/O compiler framework.

There's a need (more or less) for special blocks that can be run at the
end of the compilation phase of any arbitrary compilation unit.

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