// RUN: %target-swift-frontend -typecheck %s -swift-version 4
// RUN: %target-swift-frontend -typecheck -update-code -primary-file %s -emit-migrated-file-path %t.result -swift-version 4
// RUN: diff -u %s.expected %t.result

// REQUIRES: OS=macosx || OS=ios || OS=tvos || OS=watchos

func migrate<T, U: Sequence, V: Collection>(lseq: LazySequence<T>, lcol: LazyCollection<T>, seq: U, col: V, test: Bool) {
  _ = lseq.compactMap { test ? nil : $0 }
  _ = lcol.compactMap { test ? nil : $0 }
  _ = seq.compactMap { test ? nil : $0 }
  _ = col.compactMap { test ? nil : "\($0)" }

  _ = lseq.flatMap { [$0, $0] }
  _ = lcol.flatMap { [$0, $0] }
  _ = seq.flatMap { [$0, $0] }
  _ = col.flatMap { "\($0)" }
}