[perl #125455] Behaviour of variable phasers LTA in class definition:

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# New Ticket Created by  Jonathan Stowe 
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Hi,

   class A { my $boo will leave { say "leaving boo" }; }

gives rise to:

   Method 'add_phaser' not found for invocant of class 'A'

I appreciate that this may not be implemented yet but it would probably be 
nicer if it threw a NYI exception rather than just failing like that.

Or, at option, moving the code in Block into a trait which can be applied to 
classes as well :-)