New EEP draft: Pinning operator ^ in patterns

[Richard Carlsson]

The ^ operator allows you to annotate already-bound pattern variables as
^X, like in Elixir. This is less error prone when code is being refactored
and moved around so that variables previously new in a pattern may become
bound, or vice versa, and makes it easier for the reader to see the intent
of the code.

See also https://github.com/erlang/otp/pull/2951

Ho ho ho,

        /Richard & the good folks at WhatsApp
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