Andrew Kelley 321ccbdc52 Sema: implement for_len ...

This also makes another breaking change to for loops: in order to
capture a pointer of an element, one must take the address of array
values. This simplifies a lot of things, and makes more sense than how
it was before semantically.

It is still legal to use a for loop on an array value if the
corresponding element capture is byval instead of byref.

2023-02-18 19:17:21 -07:00

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