So, it looks like there are plenty of use cases
Just the .pm files in the perl core distribution contain over 700,000 lines. You show that those, combined with a bunch of 3rd party modules, contain only around 100 instances of code likely to be able to make use of this proposed operator. If anything I think you've shown that this is a very rare use case and hardly justifies its addition to core.

Dave.

In reply to Re^6: RFC: "assignary" operator ?= : by dave_the_m
in thread RFC: "assignary" operator ?= : by richard.sharpe

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