[stdlib] Source compatibility fix for lazy filter-filter and map-map cases #14859
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…cases In order to maintain source compatibility the type-folding behavior should not be the default in Swift 3 and Swift 4 modes.
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@swift-ci Please smoke test |
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@swift-ci Please Test Source Compatibility |
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In order to maintain source compatibility the type-folding behavior
should not be the default in Swift 3 and Swift 4 modes.