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libc++ recently split the `std` module into many top-level modules: 571178a21a
Previously if a C++ module had `#include <iosfwd>`, importing that module in Swift would make the entire C++ stdlib visible from Swift, since it was a single top-level Clang module. After libc++ got split it doesn't automatically do so, but we need to preserve the current behavior for Swift users.
rdar://119270491