Implement the new for-loop protocol #6223
Merged
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Closes #6183.
The first commit changes the compiler's method of treating a
for
loop, and all the remaining commits are just dealing with the fallout.The biggest fallout was the
IterBytes
trait, although it's really a whole lot nicer now because all of theiter_bytes_XX
methods are just and-ed together. Sadly there was a huge amount of stuff that'scfg(stage0)
gated, but whoever lands the next snapshot is going to have a lot of fun deleting all this code!