Update all uses of next to check done before consuming value #19637
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We should check
done
before consumingvalue
of anyIteratorResult
. This PR adds a new test utility,getYieldedValue
, that takes anIteratorResult
as input and returns the yielded value if the iterator was not done yet, otherwise, it throws an assertion failure. Furthermore, this PR uses this utility in all tests that do not check the done field.The PR was inspired by #19507 (review)