[racket-dev] for loops with interleaved escape continuations

If adding break&continue features to your fancy iteration syntax, I 
propose that any uses of these features in source code be somehow very 
prominent.

For example, perhaps there is a keyword that must be at the top of the 
fancy iteration form, something like 
"#:enable-continue-here-because-programmer-cannot-be-bothered-to-write-this-in-idiomatic-racket".

This prominence warns readers of the code to be on the lookout for 
surprise control flow (like they would on the rare occasion that they 
saw a "call/ec" around a loop).  It also hints to newbie programmers 
that they are discouraged from simply transliterating syntax from other 
languages (rather than learning better control flow and structuring 
techniques).

Neil V.

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