rollup #8190
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rollup #8190
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Convert some internally used functions to use a external iterators. Change all uses of remaining internal iterators to use `do` expr
.intersection(), .union() etc methods in trait std::container::Set use internal iters. Remove these methods from the trait. I reported issue #8154 for the reinstatement of iterator-based set algebra methods to the Set trait. For bitv and treemap, that lack Iterator implementations of set operations, preserve them as methods directly on the types themselves. For HashSet, these methods are replaced by the present .union_iter() etc.
Change all users of old-style for with internal iterators to using
`do`-loops.
The code in stackwalk.rs does not actually implement the
looping protocol (no break on return false).
The code in gc.rs does not use loop breaks, nor does any code using it.
We remove the capacity to break from the loops in std::gc and implement
the walks using `do { .. }` expressions.
No behavior change.
Change the former repetition::
for 5.times { }
to::
do 5.times { }
.times() cannot be broken with `break` or `return` anymore; for those
cases, use a numerical range loop instead.
This is just to aid the transistion to the new `for` loop, by pointing at each location where the old one occurs.
This was referenced Aug 1, 2013
bors
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Jan 13, 2022
…ip1995 Stop using `in_band_lifetimes` Per rust-lang#91867 changelog: none
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