I posted a revision (2) of the entity duplication 
<https://gist.github.com/CTMacUser/44afa75e379ec70201391af3a39bcdeb>. I added 
the ability to use the index placeholder as a closure anonymous argument, i.e. 
parameterize “$0,” “$1,” etc. with “$($$0).” I thought a direct 
triple-dollar-sign would be confusing, from determining which order the “$” and 
“$$” bind (or if it’s yet another new token).

I don’t think anyone has looked at this yet. I do want it for Swift 5, if 
possible. It’s the dual to variadic parameters/arguments; for producing 
comma-separated lists (instead of consuming), but can be used for non-variadic 
stuff too.  “constexpr” would help, but it’s not necessary. It would complement 
variadic generics, if added.

I want to know if the grammar scheme (the one in the “Grammar” section, not the 
troll version a few paragraphs before) is the good approach. And if the idea is 
even feasible to implement.

Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com 

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