On Mon, May 02, 2005 at 03:20:03PM -0700, Larry Wall wrote:
: Probably does something like:
:     &?BLOCK does First;  # no-op if it already does First
:     &?BLOCK.firstlist.push(&block);

Probably shouldn't use up a normal name like "First" for that.  Maybe we
can just reuse the trait name as the role name

    &?BLOCK does FIRST;  # no-op if it already does First

In this view, whether setting a trait clobbers an existing property or
merely appends to it depends on the trait handler's implementation.

I'm inclining more toward the view that all these blocks are pushed onto
the FIRST property at BEGIN time, but the "will first" properties are
wrapped in code that prevents them from running before their variable
is declared.  (Or maybe the wrapper just checks to see if the variable
is defined?  That would disable the block when you undef the variable.
That might be construed as a feature.)


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