llvm-project/clang/test/SemaCXX/for-range-unused.cpp

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// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++0x -Wunused
// PR9968: We used to warn that __range is unused in a dependent for-range.
template <typename T>
struct Vector {
void doIt() {
// FIXME: PR10168: Only warn once for this!
int a; // expected-warning 2{{unused variable 'a'}}
for (auto& e : elements)
;
}
T elements[10];
};
int main(int, char**) {
Vector<int> vector;
vector.doIt(); // expected-note {{requested here}}
}