[racket-dev] for loops with interleaved escape continuations

Loop syntax and sugar is fine.  And having "#:continue" and "#:break" 
keywords at the top of the form is sufficient warning of surprises 
ahead, IMHO.

I do have a minor ongoing concern that people coming from other 
languages lately latch onto the "for" family of forms from the start, 
don't get enough exposure to named-"let", and/or mutually/self-recursive 
procedures, and then end up shoehorning problems into the "for" forms 
(with flag variables and redundant checks and such).  "break" and 
"continue" can be good shoehorns.

I still half-seriously like the idea of having unlockable language 
feature achievements, like unlockable equipment in video games.  I might 
play with that idea soon.

Neil V.

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