change result::collect to take an iterator, and adds option::collect #11098
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This patch changes
result::collect
(and adds a newoption::collect
) from creating a~[T]
to take anIterator
. This makes the function much more flexible, and may replace the need for #10989.This patch is a little more complicated than it needs to be because of #11084. Once that is fixed we can replace the
CollectIterator
with aScan
iterator.It also fixes a test warning.