foo.cc: In function 'int main()':
foo.cc:5:5: warning: unused variable 'a' [-Wunused-variable]
    5 | int a, b, c;
      |     ^
foo.cc:5:8: warning: unused variable 'b' [-Wunused-variable]
    5 | int a, b, c;
      |        ^
foo.cc:5:11: warning: unused variable 'c' [-Wunused-variable]
    5 | int a, b, c;
      |           ^

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