This EEP adds a contextual <~ operator to begin ... end expressions,
which allows them to be usable for value-based error handling, based on
standard {ok, term()} | {error, term()} return value types.
This lets begin ... end become a control flow construct to replace or
simplify deeply-nested case ... end expressions, and prevent using
exceptions for control flow.
I want to thank Jesper Louis Andersen, Sean Cribbs, Tristan Sloughter,
Evan Vigil-McClanahan, Anthony Ramine, Bryan Paxton, and Pedram Nimreezi
for their feedback on this document.
The draft is attached to this document, and also available (along with
an incomplete reference implementation to explore some semantics) at
https://bitbucket.org/ferd/unwrap
Regards,
Fred.
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