llvm-project/clang/test/SemaObjC/deref-interface.m

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// RUN: %clang_cc1 -fobjc-nonfragile-abi -verify -fsyntax-only %s
@interface NSView
- (id)initWithView:(id)realView;
@end
@implementation NSView
- (id)initWithView:(id)realView {
*(NSView *)self = *(NSView *)realView; // expected-error {{cannot assign to class object in non-fragile ABI}}
}
@end