llvm-project/clang/test/SemaObjC/selector-error.m

// RUN: %clang_cc1  -fsyntax-only -verify -Wno-objc-root-class %s

@interface Foo
- (char*) foo;
- (void) bar;
@end

@implementation Foo
- (void) bar
{
}

- (char*) foo
{
  char* a,b,c;
  a = (char*)@selector(bar);  // expected-error {{cannot type cast @selector expression}}
  return (char*)@selector(bar);  // expected-error {{cannot type cast @selector expression}}
}
@end