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swift-mirror/test/Sema/objc_attr_requires_module_2.swift

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Swift

// RUN: %target-swift-frontend -typecheck -verify -enable-objc-interop %s
class Foo {}
_ = Foo()
@objc class NSFoo {} // expected-error {{@objc attribute used without importing module 'Foundation'}} expected-error {{only classes that inherit from NSObject can be declared '@objc'}} {{1-7=}}
// expected-note@-1 {{inherit from 'NSObject' to silence this error}} {{18-18=: NSObject}}