llvm-project/clang/test/SemaCXX/warn-unused-attribute.cpp

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// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -verify %s
struct __attribute__((warn_unused)) Test
{
Test();
~Test();
void use();
};
struct TestNormal
{
TestNormal();
};
int main()
{
Test unused; // expected-warning {{unused variable 'unused'}}
Test used;
TestNormal normal;
used.use();
}