@swift-ci please test
@swift-ci please build toolchain Windows
@swift-ci please test macOS
@swift-ci please smoke test macOS
Flipping the default here makes sense with the use of Swift in the compiler now.
@swift-ci please smoke test macOS
@swift-ci please smoke test macOS
The macOS test failure is unrelated, I'm merging this.
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This changes the default value of the CMake flag
SWIFT_ENABLE_EXPERIMENTAL_CXX_INTEROP
fromFALSE
toTRUE
.C++ interop is an important part of the compiler. If necessary, it's still possible to disable it explicitly.