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[opt-transform-range] Do not assume that Range::iterator exists. #27051

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2 changes: 1 addition & 1 deletion include/swift/Basic/STLExtras.h
Original file line number Diff line number Diff line change
Expand Up @@ -611,7 +611,7 @@ makeOptionalTransformIterator(Iterator current, Iterator end,

/// A range filtered and transformed by the optional transform.
template <typename Range, typename OptionalTransform,
typename Iterator = typename Range::iterator>
typename Iterator = decltype(std::declval<Range>().begin())>
class OptionalTransformRange {

Iterator First, Last;
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