Testing 'canImport()' non-existing submodule in system frameworks.

can_import_submodule_in_system_framework.swift

// RUN: %target-typecheck-verify-swift

// Testing 'canImport()' non-existing submodule in system frameworks.

#if canImport(CoreImage)
import CoreImage

#if !canImport(CoreImage.CIFilterBuiltins)
#error("Should can import CoreImage.CIFilterBuiltins")
#endif

// Should fail if checked for a non-existing submodule.
#if canImport(CoreImage.BOGUS)
import CoreImage.CIFilterBuiltins
#endif

func testNotImported() {
    if #available(iOS 13.0, tvOS 13.0, macOS 10.15, *) {
        _ = CIFilter.qrCodeGenerator()
        // expected-error@-1 {{type 'CIFilter' has no member 'qrCodeGenerator'}}
    }
}
#endif