llvm-project/clang/test/Sema/warn-unused-label.c

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// RUN: %clang_cc1 -fsyntax-only -Wunused-label -verify %s
void f() {
a:
goto a;
b: // expected-warning{{unused}}
c: __attribute__((unused));
d: __attribute__((noreturn)); // expected-warning {{The only valid attribute for labels is 'unused'}}
goto d;
return;
}